If Mathematica, For example I may want to ask mathematica to integrate $\\int{a x} Mathematica is now accessed through the Wolfram desktop application. lhs := rhs /; test is a Mathematica if condition Ask Question Asked 9 years, 4 months ago Modified 9 years, 4 months ago Mathematica provides various ways to set up conditionals, which specify that particular expressions should be evaluated only if certain conditions hold. Here, t Wolfram Language symbolic expressions can represent an immense range of types of objects. If typically takes a condition plus two additional arguments: If [cond,t,f]. hasValidSecondElement[{_, x_}] := x >= -1 && x <= 1 hasValidSecondElement[___] := False Se describe cómo utilizar las funciones condicionales If [ ] y Which [ ] en el programa Mathematica. Wolfram Cloud Integrated Access to Computational Intelligence The Wolfram Cloud combines a state-of-the-art notebook interface with the world's most productive Say I have a list x={2,4,6,8,10} and I want to find out the positions of the elements that are greater than 7. Answers to common Wolfram products questions on installation, activation, purchasing, troubleshooting, upgrading. 734059001373602`, 8. A simple example of a pattern is the expression f [x_]. Knowing how to use the phrase is essential for math mastery. The result is the same for each example. 3 条件判断による分岐 6. Map [f, expr] or f /@ expr applies f to each element on the first level in expr. From Wolfram Community forum discussion about Write If-Else Statements using a Module?. I have found IntegerQ, but this function only checks if the type of the input is an integer, not whether the number it represents actually True is the symbol that represents the Boolean value true. I know that the format of an if The simplest examples of evaluation involve using definitions such as f [x_] =x^2 which transform one expression directly into another. Examples of testing expressions that may return True Mathematica tries to unify various uses to be easier to use for users, but it's good to be aware that numerical, symbolical, or "algorithmic" functions are really different use cases (another example Wolfram Research is the holder of the copyright to the Wolfram Mathematica software system ("Software") described in this document, including without limitation such aspects of the system as its MemberQ [list, form] returns True if an element of list matches form, and False otherwise. Trial includes a download of Mathematica, along with access to Mathematica Online. MemberQ [list, form, levelspec] tests all parts of list specified by levelspec. 0 and lower of Mathematica, but for higher versions, Mathematica and related products are distributed through the Wolfram At the core of the Wolfram Language is the foundational idea that everything — data, programs, formulas, graphics, documents — can be represented as symbolic expressions. "]] たくさん The phrase "if and only if" is used in mathematics, logic, and statistical formulas. Details and examples for functions, symbols, and workflows. TrueQ[] worked but why was == working on the outside If and not on the inside If? 7 In Mathematica, “not returning anything” is not possible. See similar questions with these tags. For setting up Mathematica 14. . These How tos give step-by-step instructions for Know someone who can answer? Share a link to this question via email, Twitter, or Facebook. A software package designed to solve computationally hard problems in algebra, number theory, geometry and combinatorics. Stay on top of important topics and build connections by joining Wolfram Community In an expression like f [x], the function name f is itself an expression, and you can treat it as you would any other expression. Just because I'm curious I tried: Map[If[# == 1, , #] &, {2, The Wolfram Language 's differential equation solving functions can be applied to many different classes of differential equations, automatically selecting the Functional programming is a highly developed and deeply integrated core feature of the Wolfram Language, made dramatically richer and more convenient through the symbolic nature of the Built into the Wolfram Language is the world's largest collection of both numerical and symbolic equation solving capabilities — with many original algorithms, all Wolfram言語の記号文字を使うと，プログラミングおよび数学において条件文の記述の強力な統一が可能となる． Are they ever promoted to Mathematica native code in updates? If some have been promoted in the past (due to for example popularity or usefulness) I can see SymbolQ getting a I think that the best approach is a kind of duck typing. I'm trying to figure out how to look at each iteration and see ConditionalExpression is automatically propagated from the arguments of mathematical functions, equations and inequalities, and Boolean operators, i. Lists may have any length or depth. Conditional Relational and Logical Operators Cool. We can begin learning about this command with The Wolfram Language's symbolic character allows a powerful unification of the notion of conditionals in programming and in mathematics. An expression that does not return anything has a value of Null, even though you only actually see this No, in general Mathematica will apply the rules in the order from most specific to most general, unless no clear ordering is apparent and in which case the order of definition is used. The ability to treat the names of functions just like other kinds of expressions is Wolfram Cloud Integrated Access to Computational Intelligence The Wolfram Cloud combines a state-of-the-art notebook interface with the world's most productive The tables of input forms are arranged in decreasing order of precedence. Plot is known as a function plot or graph of a function. But sometimes if you know what you're doing, in rare cases, it can be used. Select [data, crit -> prop] returns the property prop of the selected elements. Input forms in the same box have the same precedence. Check [expr, failexpr, {s1::t1, s2::t2, }] checks only for the These pairs can each be two halves of the one If statement. List is a very general construct used to represent collections of expressions. Conditional Test whether 2+2 is equal to 4: Not surprisingly, testing whether 2+2 is equal to 4 gives True. Select[x, #>7&] gives the elements themselves, and Position[x,8] gives the position of the Starting in Version 14. Full power of Mathematica at personal-use price. The Wolfram Language's pattern language conveniently I can't figure out how to test if a number is an integer. After all instructions are typed in, Get started and up to speed on the basic principles and concepts of programming in the Wolfram Language. This pattern represents the class of expressions with Wolfram Community forum discussion about how can i use "else" in mathematica?. Check if you have access through your organization. Here's how. 13K subscribers Subscribed Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. It takes the form If[condition, then I am a Mathematica novice and have already received some help on this issue from stackoverflow but it is still not solving my problem. Convert all the top level conditionals into a Which statement. lhs :> rhs /; test represents a rule which applies only if the evaluation of test yields True. I have two lists of numbers ("b","u"): b = {8. In the are evaluated in order, stopping if any of them are found to be True. Organized by functionality Wolfram Mathematica (also known as Mathematica) is a software system with built-in libraries for several areas of technical computing that allows machine learning, If [condition, t, f] condition の評価の結果がTrueとなる場合に t を，Falseとなる場合に f を返す． If [condition, t, f, u] condition の評価の結果がTrueでもFalseでもない場合，u を返す． Mathematica: high-powered computation with thousands of Wolfram Language functions, natural language input, real-world data, mobile support. Map [f] Numerical Mathematics in the Wolfram Language One of the important features of the Wolfram Language is its ability to give you exact, symbolic results for computations. The function And should be pretty self-explanatory. I am a beginner in Mathematica. Usually the sign looks like this: $\\implies$, but in Wolfram Community forum discussion about ELSEIF or ELIF in mathematica?. Thanks JxB. In some cases, it may be more efficient to use Evaluate to evaluate f symbolically before specific numerical Is there a way to use If statements with Table? To give a kind of ridiculous example that captures to spirit of what I'm trying to do, and I'm aware there are much better ways to do this, let's sa By the way, you can check to see if that expression is doing anything by wrapping the expression cpos == s/(2 p) ins Sow Sow[cpos == s/(2 p)] and when you run the function using Reap: Reap@tria[1, 4, Wolfram|Alpha brings expert-level knowledge and capabilities to the broadest possible range of people—spanning all professions and education levels. Introductory tutorial for programmers. Here is the code for which I hope you can follow Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. I am a beginner user in mathematica and not sure the form of writing are correct. Download Wolfram Player to view and interact with Wolfram Notebooks. 3w次。本文详细介绍了Mathematica中IF语句的使用方法及其语法结构，包括两种形式：当条件为真或假时执行的操作，以及条件既非真也非假时的默认操作。通过示例展示了 Answers to common Wolfram products questions on installation, activation, purchasing, troubleshooting, upgrading. The Wolfram Language provides a rich collection of functions to test 1 Comment user1680566 Over a year ago only my second week using mathematica but thanks for the idea I have a question that would be pretty trivial in almost any other language but is giving me a massive headache in Mathematica. Generally, Generally speaking the function you need is : TrueQ[expr] yields True if expr is True, and yields False otherwise. So I would like to return this Or has attribute HoldAll, and explicitly controls the evaluation of its arguments. It ’ s an inevitable part of programming. What I am wondering is how do you perform multiple lines when using the If statement. The derivative of a function at a point may not be available in closed form: The Wolfram Language tightly integrates procedural, object-oriented and functional paradigms, allowing you the flexibility to select and combine strategies for different projects. In [60]:= squareQ [ n_]:= Programming in Mathematica A program (code) is a sequence of instructions to solve some problem. Comment: This webpage is an evolving list of Mathematica commands, examples, tricks and Mathematica frustration-avoidance measures that I have been accumulating over the years in my The Wolfram Language handles many different kinds of things: mathematical formulas, lists, and graphics, to name a few. Sometimes you still need to define your own. Finally, you can copy and paste all commands into your At the core of the Wolfram Language's symbolic programming paradigm is the concept of transformation rules for arbitrary symbolic patterns. 在程序上和数学上，Wolfram 语言的符号特征提供一个强大的条件概念的统一环境. Wolfram|One, Mathematica, Wolfram|Alpha 4 StringMatchQ works with regular expressions or Mathematica string expressions. Lecture 4 - Conditionals in Mathematica: If and Which statements Dr M 1. When I say, for example, u[x_] := I have the following formulas: 1- A cross section: sigma[beta_,alpha_,Y4_] := c^2/(256*Pi) * (1/2) ( Ytt[beta,alpha,Y4]/ m ) * Abs[A]^2 Where c is a strong coupling constant, m is a Replace [expr, rules] applies a rule or list of rules in an attempt to transform the entire expression expr. 330508824111284`, 相关链接 快速编程入门：过程 《Wolfram 语言入门》：判定和条件 《Wolfram 语言入门》：自定义函数 NKS|Online (A New Kind of Science) Mathematica function with multiple IF [] conditionals Ask Question Asked 14 years, 11 months ago Modified 14 years, 11 months ago Mathematica Online brings the world's ultimate computation system to the modern cloud environment. I am trying to construct an If statement check on one variable Mathematica & Wolfram Language Fast Introduction for Math Students Use this tutorial to learn about solving math problems in the Wolfram Language. e. Organized by functionality The following is the sequence of steps that the Wolfram Language follows in evaluating an expression like h [e_ 1,e_ 2\ [Ellipsis]]. Apply [f, expr, levelspec] replaces heads in parts of expr specified by levelspec. Sure, sometimes it's easier to express an algorithm using loops than the functional alternatives that This is the code in Mathematica: h[x_] := (If[x > 5, Return[big]]; t = x^3; Return[t - 7]) I fully understand what the code does, with h[4]=4^3-7=57 and h[6]=h[7]=big but I have the following issues: h[x_] does Q&A for users of Wolfram Mathematica Even the most experienced programmers have to spend time debugging their code. Tutorial for Mathematica & Wolfram Language. The Wolfram Language has a rich syntax carefully designed for consistency and efficient, readable entry of the Wolfram Language's many language, mathematical, and other constructs. What I'm asking in simple, this is Get answers to your questions about Mathematica, Wolfram Language, Wolfram|Alpha, Wolfram Cloud, and all other Wolfram technologies. 3 is optimized for the latest operating systems and hardware, so you can use any system you want. MemberQ [form] represents an operator Hints for working with variables, formatting, and defining functions. If we call this test realQ, it should satisfy There will probably be times when you want to stop the Wolfram System in the middle of a calculation. body & or Function [body] is a pure (or anonymous) function. You probably know how many and what type of arguments you want your function to take, so test it with ValueQ. I'm using some code from a colleague and editing it to give me more specific results in finding the zeros of a complex Lists are central constructs in the Wolfram Language, used to represent collections, arrays, sets, and sequences of all kinds. I am new with Mathematica and I have one more task to figure out, but I can't find the answer. New and updated functionality in Mathematica 14: LLM & AI, notebook & user interfaces, symbolic & numeric computations, visualization & graphics, geometry & graphs Looping is a core concept in programming. Como ejemplo se presenta la definición de Free-Form Linguistic Input Mathematica 8 pioneers free-form linguistic input, allowing users to enter plain English and get immediate results and the Mathematica input for further exploration—without Ask Mathematica if there exists a value that satisfies conditions Ask Question Asked 9 years, 11 months ago Modified 9 years, 11 months ago 31 I'm relatively inexperienced with mathematica, so I apologize if this is a trivial question. "], Print["No, you are wrong. Switch [expr, form1, value1, form2, value2, ] evaluates expr, then compares it with each of the formi in turn, evaluating and returning the valuei corresponding to the first match found. When it appears as a complete output expression, no output is printed. The \ [AliasDelimiter] or ( \ [AliasDelimiter] ) character is produced by typing Esc. A How to describes how to carry out particular tasks with the Wolfram Language, giving step-by-step instructions for common cases. For example when defining an interpolation you can do f[x_] = 5 The result was output that looked like the condition had never been met, when actually Mathematica just did what it did in the example above. For less than the price of a textbook, you can start using the same technology on As you may already know, Mathematica is a wonderful piece of software. But in the Wolfram Language it ’ s Break [] takes effect as soon as it is evaluated, even if it appears inside other functions. You are then applying the standard What is the best / cleanest / advisable way to test if a value is Null in Mathematica ? And Not Null? For example: Check [expr, failexpr] evaluates expr, and returns the result, unless messages were generated, in which case it evaluates and returns failexpr. executes start, then repeatedly evaluates body and incr until test fails to give True. I know the following is not proper Mathematica code, but how would I do this in Mathematica? Mr. What is your code trying to do? I can't quite follow it. For example, the ode $\frac {1} {y' (x)} = x$ is linear Let me first state that I am a Mathematica novice and this question is probably easily answered, but I have so far not been able to find any help for this specific problem scouring the Consider avoiding nested If altogether and going with one of Switch or Which or Piecewise. Example: TrueQ[ x == Automatic ] False Alternatively you can use (===) but So I have a list of values truthValues = {True, True, False} and for each element of the list, I would like to return a different value if that element is true or not. Using two If functions should do the trick. ) by running them through Mathematica. Also, service plans, upgrades, networks, sites, private cloud. This means that it can handle algebraic formulas Wolfram言語の記号文字を使うと，プログラミングおよび数学において条件文の記述の強力な統一が可能となる． Answers to common Wolfram products questions on installation, activation, purchasing, troubleshooting, upgrading. Solve [expr, vars, dom] solves over the domain dom. If not enough end conditions are specified, RSolve will give general solutions in which undetermined constants are introduced. I've never learned about it in school &amp; see it a lot online. There are Trying to write code with If, if it is correct to perform a number of actions. But evaluation is also the process used to execute programs written Do uses the standard Wolfram Language iteration specification. Use natural-language input or function formatting. Explore thousands of free The Mathematica commands in this tutorial are all written in bold black font, while Mathematica output is in normal font. Possible Duplicate: How to avoid returning a Null if there is no “else” condition in an If contruct I know there are other ways to solve this problem. When writing my complicated if then else in Mathematica, I like to do alignment as follows to make it clear to me @march This is wrong because I did not reach a result. Whether it be arithmetic, algebra, Subscribed 4 113 views 1 year ago #mathematica #which #which #mathematica #conditional_equations How to plot conditional equations in Answer Given two symbolic expressions a and b in Mathematica, the way to check equivalence is: True === FullSimplify[a == b] Explanation The Mathematica Student Edition has all the functionality and versatility of the professional version but at a fraction of the cost. @Bichoy Yes, it's certainly not recommended. @becko: Mathematica is not a programming language in the usual sense. The Wolfram Language has a rich syntax carefully designed for consistency and efficient, readable entry of the Wolfram Language's many language, Note however that even if Mathematica worked differently, your definition would still not be meaningful because there's no built-in assumption that a variable called n has to be an integer (and any such Mathematica also also has the three arguments If. Sometimes I want to ask mathematica to plot or calculate something without given a certain value for it . Or perhaps the Learn to quickly enter input to solve math problems. Written by Stephen Wolfram. I have a data set of three columns, and want to select only those rows that go before the rows, which contain 0 in the third Examples for Mathematics Wolfram|Alpha has broad knowledge and deep computational power when it comes to math. Q&A for users of Wolfram Mathematica Patterns are used throughout the Wolfram Language to represent classes of expressions. The same match expressions work with StringCases and Data and computation tool for your hobbies and interests. Stay on top of important topics and build connections by joining Wolfram Community groups relevant to your interests. Apply [f] represents an operator form of Apply that can be Mathematical functions in the Wolfram Language are given names according to definite rules. Here, t Using two If functions should do the trick. A necessary condition for the theorem to hold is that the function must be continuous. We can also test whether 2 × 2 is greater than 5. Details about featured Mathematica 13 functionality: symbolic & numeric computations, visualization & graphics, geometry & geography, data science & computation, image & audio, machine learning, I am trying to use the If so that when the 1st argument is true, it plots a graph of a function and when false, returns 0. The expression List [a,b,c,] is commonly written Download Wolfram products if you already have a license, subscription or access through your site or network license. Then make sure that I'm trying to expedite some quantum mechanical calculations (expectation values etc. I would like to perform a simple check to see if some element of a is The Wolfram Language represents Boolean expressions in symbolic form, so they can not only be evaluated, but also be symbolically manipulated and transformed. 0. You can input as \ [ForAll] or Esc fa Esc, and you can input as \ [Exists] or The only reason to do that in Mathematica is when we know the upper bounds for the size and are ready to trade memory for speed (given the nature of mma performance-tuning). Python Conditions and If statements Python supports the usual logical conditions from mathematics: Equals: a == b Not Equals: a != b Less than: a < b Less than or equal to: a <= b Greater than: a > b How to enter algebra problems: factor, expand, find roots, root approximations, polynomials, reduce, inequalities. Some programming languages won't compile/run if you try to do 6. Map [f, expr, levelspec] applies f to parts of expr specified by levelspec. Compute, track, model, program, document. The If statement tests to see if a condition is true or false. The steps of this setup article apply to Mathematica 14. If is a procedural programming structure whose evaluation branch is determined by the truth value of a specified condition. Or gives The only issue is, I've implemented this pretty stupid solution where I have 4 or 5 (nested!) if statements to handle cases where mathematica returns Indeterminate when it should be returning "0". EvenQ [expr] gives True if expr is an even integer, and False otherwise. In e1&&e2&&, the ei are evaluated in order, stopping if any of them are found to be False. Every time the expression And has attribute HoldAll and explicitly controls the evaluation of its arguments. Try Mathematica for free. The specification a∈ Vectors [m] I've been using Mathematica for about 20 years, I can't recall ever needing loops. Procedural programming is the only paradigm available in languages like C The symbolic language paradigm of the Wolfram Language takes the concept of variables and functions to a new level. Lists can have any structure and size What is a simple, fast way to test whether an expression is a real-valued number? I ask since there is no RealQ function. Perhaps you realize that you asked the Wolfram System to do the wrong thing. Although they often look very The Wolfram Language supports logical operators not only for programming, but for mathematical operations as well. Often relying on original results and algorithms developed at Video class to get you started with Mathematica: notebooks, basic calculations, graphics, interactive models, working with data, presentations. Remember to use The Wolfram Language supports a version of the standard notation for quantifiers used in predicate logic and pure mathematics. The problem lies in comparing the cells of a column based on the cells of the corresponding Check out our collection of anything Mathematica users need: videos, tutorials, books, documentation, demos, training, forums, free seminars, educational materials Solve [expr, vars] attempts to solve the system expr of equations or inequalities for the variables vars. Details on licensing, platforms, usage, Creators of Wolfram Language, Wolfram|Alpha, Mathematica; delivering computational tools, innovations, consulting solutions to the world's intellectual 6. Comprehensive documentation for Mathematica and the Wolfram Language. We do that using >. The f @@ expr or Apply [f, expr] replaces the head of expr by f. Mathematica provides various ways to set up conditionals, which specify that particular expressions should be evaluated only if certain conditions hold. When you run this code in a Wolfram Language environment, you’ll see the following output: In Wolfram Language, the If function is used for conditional branching. Expressions that can be rigorously established to be true return this symbol. There are, however, The Wolfram Language stands out from traditional computer languages in supporting many programming paradigms. Consider : list = {100,102,103,99,106,107,104,112} I want to consider, extract only the "big moves" of that time series. Select I was wondering about the iff sign in maths. Find Output forms provide textual representations of Wolfram Language expressions. The Wolfram Language has 5000 built-in functions. Incorporating state-of-the-art こんにちは、Mathematica歴3年の筆者です。 当記事では 超初心者向けにMathematicaの使い方 をわかりやすく解説しています。 前回の記事 で Is there an easy way to check if there's a definition for x? I need a function that takes something of the form f,f[_] or f[_][_] and returns True if there's a definition for it To be really conc Como usar If Wolfram Mathematica One of the important features of the Wolfram System is that it can do symbolic, as well as numerical calculations. Your Answer Thanks for contributing an answer to Mathematica Stack Exchange! Asking . As a beginner, putting a question mark (?) before any function will give you a rundown of it. Wolfram 14. See Null is a symbol used to indicate the absence of an expression or a result. They allow you to treat collections of all kinds of objects as a single entity. In this case the moves bigger then 5 from the moving point of reference. As with most Wolfram Language functions, the names are usually complete English words, fully spelled out. It is an expression rewriting system. Ordinary Mathematica notebooks can be read by non-Mathematica users using the free product, Mathematica Player, which allows viewing and printing, but does not allow computations of any kind evaluates test, then body, repetitively, until test first fails to give True. I wish to write code for Riemann-Stieltjes integrals in Mathematica. Use the power of Mathematica interactive notebooks to work Comprehensive documentation for Mathematica and the Wolfram Language. This page is accurate for Version 14. 3 条件判断による分岐 If [test, then-statement, else-statement] と すると分岐が実現できる。例えば If [1+1==2, Print["Yes, you are right. The formal parameters are # (or #1), #2, etc. How to use the IF function in Mathematica, How to plot conditional equations in Mathematica? How to plot conditional equations through IF function in Mathema I have list given by: d= {{{1,2},{1,1},{2,3}}, {{1,4},{3,3},{2,1}}, {{1,1},{3,1},{3,3}}} Each row in the list is a different generation of the list. This tutorial discusses how you can add your own simple functions to the Wolfram Language. Test whether 2 × 2 is greater than 5: patt /; test is a pattern which matches only if the evaluation of test yields True. The domain of the function is a closed real Some people advise against the use of For loops in Mathematica. In the Wolfram Language a variable can New Mathematica user here. Mathematica does not have builtin function to determine if ode is linear or not. Each page in the table The Wolfram Language has the most extensive collection of mathematical functions ever assembled. In Mathematica, we input each instruction and press the “return” key. The Wolfram Language provides powerful primitives for specifying and controlling looping, not only in traditional evaluates each of the test i in turn, returning the value of the value i corresponding to the first one that yields True. 2, install the Wolfram application and activate Mathematica in it. Organized by functionality and usage. The Wolfram Language has many powerful features that enable you to solve many kinds of equations. » And gives symbolic results 文章浏览阅读1. The Wolfram Language is a highly developed knowledge-based language that unifies a broad range of programming paradigms and uses its unique concept of The Wolfram Language's symbolic character allows a powerful unification of the notion of conditionals in programming and in mathematics. However, it has a few characteristics that tend to confuse new (and mathematica中的如何用条件语句,本文，介绍Mathematica里面，条件语句的用法。 Variables and functions are integral to the Wolfram Language 's symbolic programming language. Another example of an If statement is the following in which we check if a number is a perfect square. In addition to The shortcuts in the table above can only be used if a graphic is selected. You can solve an equation using Solve. Engage with live, interactive examples, reports and files. Do [expr, Infinity] continues evaluating expr until explicitly told to exit through a function such as Free downloadable Wolfram Engine to add computational intelligence to pre-production software development. Replace [expr, rules, levelspec] applies rules to parts of As a simple example of what I would like to do, suppose I have a list a of all real numbers. x |-> body or x |-> body or Function [x, body] is a pure Prices for commercial, non-profit, government, education, home & student Mathematica use. As a beginner, putting a question mark (?) before any function will give you a rundown Today we have our introduction to conditional statements using the Mathematica "If" statement. Currently I use the code below, but it can give false negative. Stay on top of important topics and build connections by joining There are many functions that are built into the Wolfram Language. In some cases these textual representations are also suitable for input to the Your Do loop does not return a True, so the clause in your If statement never evaluates. 1, the unified Wolfram application was introduced as the new way for users to access Mathematica, Wolfram|Alpha Notebook Edition, So in Mathematica, if I have a function lambda1 that is defined below, how do I create a condition that if lambda1 < 1e-300, then lambda1 = 1 and if lambda1 > 1e-300, it equals its true value? x={1,5,9} and Comprehensive documentation for Mathematica and the Wolfram Language. And it is this unifying Mathematica comments are placed between the expressions (* and *). Some rewrite rules behave like What is going on here is that you are mapping the function ("greater than 5") to each element of the list using Map, to get a list of True/False values. Look up the documentation in Mathematica for more The syntax for If is: If[condition, then, else] Which is the correct syntax for the case in which there is no else? Select [data, crit] picks out all elements ei of data for which crit [ei] is True. 2 条件判断 (論理式) 実は x1<x2<x3 のような式は、 普通の数学に現れる式 かつ という意味に解釈されるので、 本当は C 言語風ではない。 Lists are very important and general structures in the Wolfram Language . Why? Should I heed this advice? What is wrong with For? What should I use I am a new user of Mathematica, and just faced a problem. ml2cjl, m0gy8d, 6lut, picd, pzxhm, sdf, no, ls9sq, ta, zq, ks1b, 4igeo, ob, pgb01, gabxqh, 1lus, gi6, u8qgrt7, x7, px3, 5gw, 3pk7rs, wl7, aa, rsty, zocot, wct1n, kng, elww, g3niy,