Questions tagged [syntax]

Questions on correct (or improved) formulation of Mathematica code to achieve particular results. Use this tag (not "symbol") for questions about all those odd @@ /@ # & and ~ characters.

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14
votes
3answers
3k views

Flatten at a certain level

In an earlier question the brainteasing fourth syntax variant of Flatten was discussed. I see that with ...
5
votes
3answers
444 views

Is $2x$ documented?

According to the official documentation of Times[], multiplication of $x$ and $y$ is represented as one of x*y x×y ...
10
votes
7answers
974 views

How to take the beginning and end parts of a list with simpler syntax?

So basically you have a table of some values, let's call it a: a=Table[n,{n,10}]; (*{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}*) And you ...
5
votes
2answers
473 views

Game schedule where each player meets only once

I am trying to generate a game schedule where $k$ players at the time, out of $n$ participants, meet in each game, but any player meets another player only once. In each game, with $k$ simultaneous ...
6
votes
1answer
212 views

Best way to write an equation with subscripts and superscripts

This post is not about a specific Mathematica problem but about to develop the best way to enter mathematical equations with subscripts and superscripts. I have a ...
5
votes
5answers
263 views

Integral of the integral using NIntegrate

Consider the integral NIntegrate[Exp[-NIntegrate[x, {x, 0, y}]], {y, 0, 2.8}] It displays an error ...
0
votes
0answers
36 views

Definition of a matrix [duplicate]

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2
votes
1answer
81 views

Syntax highlighting indicates I'm unable to comment properly in Mathematica using (**)

I wanted to "comment" some code so the input inside (* *) is ignored. I tried this but the last term z[3] looks like it is not ...
0
votes
1answer
43 views

How to create the progress indicator for the following process?

Consider the code Table1[m_]:=Table[{m,NIntegrate[Exp[-I*m*x],{x,0,1000}]},{i,0,8000,1}] Table2=Join[Table1[1],Table1[5],Table1[0.2],Table1[0.08]] How to create ...
4
votes
3answers
268 views

Through: how to use it with subtraction of functions?

As the documentation says the command Through works as it follows: f[x_]=x; g[x_]=x^2; Through[(f+g)[x]] --> x + x^2 Like ...
80
votes
1answer
2k views

Incompatible Changes since Mathematica Version 7?

There is documentation of the incompatible changes made to Mathematica with each major release: Incompatible Changes since Mathematica Version 1 Unfortunately that documentation simply stopped ...
5
votes
1answer
66 views

How to create a 2D table with varying step?

I would like to produce a table with 2 coordinates, where a step for one coordinate depends on the value of another one. I tried to do this in the following way: ...
0
votes
1answer
66 views

How to make split tables in Join?

I have a command Table0[mS_]:=Table[{mS*i,i^2},{i,1,20}] Table1=Join[Table0[1],Table0[2],Table0[3]] When calling Table1[[1]] I expect to get the element Table0[1]...
5
votes
1answer
73 views

Variable dimensional integrals

I need to Integrate a function, but let the number of dimensions vary. Integrate[Product[Exp[-( t[[i]] )^2], {i,1,4}], options] ...
18
votes
3answers
2k views

How can one define an infix operator with an arbitrary unicode character?

You can setup "UsefulFunction[a, b]" to use custom infix notation "a ↔ b" as follows: ...
1
vote
1answer
30 views

Behavior of PlotLegends

I want to have a plot of $x^{\alpha}$, where $\alpha$ is an input, and a plot legend which displays something like $\alpha = \# \text{ rad}$ on the following plot, where # is determined by the input. ...
4
votes
3answers
92 views

EntityValue timeline

I try to use EntityValue to get the returns of a stock from January 1st 2019 to today. When I use ...
35
votes
3answers
1k views

Prefix operator with low precedence

The question is simple, but I will elaborate on the background as well for those interested in the idea: How to define a new operator with specified precedence value? Background Mathematica was ...
1
vote
0answers
119 views

Light beams reflecting from parabola

How can we show the paths of three light beams in Mathematica which bounce back after hitting the parabola, in a single plot? Suppose we have the following code ...
2
votes
1answer
115 views

Mathematica just takes infinite time to solve this

Can You help? I don't even care about the exact solution. I will be satisfied by the series expansion of the result around a=0. I tried to solve by series expansion and the same result .. infinite ...
0
votes
0answers
53 views

How to handle the instability of the integral evaluation in the following case?

I want to integrate a function \[Kappa][gh, ms, ts, th, ph] (for all definitions, see a code below) with the distribution ...
0
votes
0answers
25 views

RegionPlot fails

Consider a function f[x_,y_]:=NIntegrate[g[x,y,z],{z,1.1*x,3000}] where g[x,y,z] is some function. The function f[x,y] is smooth and works perfectly when Plot it....
0
votes
3answers
56 views

Removing the square-brackets and their contexts from an expression

Suppose I start with an expression like y[t] + x[t]: is there a function that lets me remove the [t] elements, so I obtain the ...
16
votes
3answers
497 views

Language`* documentation project

Language` context is around for a long time. It is also heavily used (APIFunctions / FormFunctions dependencies deployment rely on it). It is undocumented and ...
10
votes
1answer
137 views

Why does Success[…][key] work and Failure[…][key] doesn't work?

I'm trying to figure out what is a quick way to add error reporting to my user defined functions. I was experimenting with Success and ...
0
votes
0answers
17 views

Dot product returns symbolically when undesired [duplicate]

StateProb[state_, projector_] := Dot[state, projector, state]; StateProb[state1, Projector[{-(I/Sqrt[2]), 0, 0, 1/Sqrt[2]}]] State is {1/Sqrt[2], 1/Sqrt[2], 1/...
11
votes
6answers
8k views

Notation of partial derivative

I want to write partial derivatives of functions with many arguments. Why is it that when I type f[x,y] ctrl+6 (0,1) it turns out to be bad syntax? The output of ...
9
votes
3answers
197 views

How can I automatically replace [[ and ]] with the \[LeftDoubleBracket] and \[RightDoubleBracket] operators?

When you type ->, it is automatically turned into the \[Rule] character. Can we configure our frontends to do the same for ...
3
votes
1answer
168 views

What does “ Im' ” mean? [closed]

I am trying to take the curl/derivative of the function A. What does " Im' " mean here? Why does Mathematica attempt to take the derivative of the Im function here? ...
3
votes
1answer
106 views

Where to find order of arguments for default functions

Lets take for example the Laplacian. So I want to apply it in spherical coordinates, so I go the the associated documentation page (https://reference.wolfram.com/language/ref/Laplacian.html?view=all) ...
1
vote
0answers
61 views

Difficulty with ExternalEvaluate

I am trying to import a Python function or execute a Python script from inside Mathematica, but the ExternalEvaluate command drives me nuts. I proceed cautiously ...
3
votes
2answers
102 views

Overloading a function to pass in an expression rather that the name of a function

This is an example of procedural programming borrowed from Paul Wellin's book. It's a simple implementation of the Newton-Rhapson method. I overloaded the findRoot ...
0
votes
0answers
29 views

Having difficulties using results returned by Solve

I'm new to Mathematica, and I am still having some issues figuring out the general syntax. I've got to use Mathematica, as my research requires a powerful symbolic math program. I'm having trouble ...
6
votes
2answers
113 views

Separation of statements vs “space mul”, formal definition of Mathematica syntax?

In Mathematica, space can often be used to indicate multiply. For example "a b" = "a * b". On the other hand, in a *.m file, we also have multiple statements separated by newlines. How does the ...
2
votes
1answer
125 views

SyntaxForm not correctly parsed by FrontEnd

When using TagBox with SyntaxForm, I noticed sometimes it is not well parsed by the FrontEnd....
21
votes
1answer
464 views

Is there a linter to help write good Mathematica code?

I don't do much real programming, but I've recently been turned on to Atom, which has linter plugins for over 50 languages to make coding easier (most drawing on pre-existing lint-like programs). In ...
0
votes
0answers
108 views

Remove background image and redraw lines in black

I do not know if the title is correct. The image that I upload has liked me a lot because of the characteristic that no matter the angle it seems that it is looking at you, you could indicate me how ...
16
votes
2answers
747 views

What kind of hypergeometric function is it?

I found a formula for an integral of a product of three Bessel functions at The Wolfram Functions Site: I cannot understand what kind of hypergeometric function it is. The Mathematica code given for ...
2
votes
1answer
61 views

How to pass parameter to an API function?

I have a very simple question. I don't know how to pass multiple parameters to a web deployed APIFunction. I created a function: ...
1
vote
1answer
47 views

ListCountourPlot does not show any result [closed]

I was trying to show the heat conduction of Laplace equation problem.But the plot does not show properly ...
5
votes
2answers
95 views

Converting prefix to infix

Is there a way in Mathematica to convert prefix to infix notation (where precedence order is preserved)? For example, how would I convert S[a, S[b, c]] to ...
8
votes
2answers
214 views

Finding the point closest to a parameteric curve produced by a numerical method

Question How can I find the closest point to a parametric curve produced by a numerical method. General Context I have a parametric curve (which I will call $g$) produced from a averaging many ...
3
votes
2answers
83 views

Trying to plot the norm of the solutions to NDsolve

I have been tried to do two things with the solutions from NDSolveValue plot the norm of the solutions of a differential equation system versus time. plot one component of the solutions of a ...
0
votes
0answers
30 views

How to automatically see user defined function arguments list?

Having typed a user-created function's name I would like to be able to see either the concise syntax dropdown available for inbuilt functions (shown below left) or alternatively to be able to see the ...
0
votes
1answer
44 views

Maximize function subject to condition [closed]

What commands should I use in Mathematica to obtain the maximum or minimum of a function subject to conditions? For example, find the maximum of the following function? $\qquad T=\sqrt[3]{2\,x+5} + \...
1
vote
1answer
67 views

Defining iterative algorithms [closed]

Assume the iterative algorithm of interest to be as follows: ...
0
votes
0answers
30 views

Syntax Error, Text Style and escaping characters

I have a weird error (I guess it could be called a bug), where a file containing the text line (as in in a cell you create with Alt-7) gives a syntax error when called from the terminal using ...
1
vote
1answer
102 views

Rotation in physics [closed]

I have a mathematica problem in theoretical physics: There is a rotation axis $\vec{n}$ with $|\vec{n}|=1$. Each other vector $\vec{v}$ can be seperated in relation to $\vec{n}$ in a parallel part ...
2
votes
1answer
44 views

What's the difference between $Context<>“*” and “`*”?

When set context unique to this notebook: ClearAll @@ { $Context<>"*" } Clear["`*"] can both clear the variables I assigned. I just wonder what's the ...
2
votes
1answer
68 views

center of mass, total momentum

Has someone an idea how to solve the 1. question for ANY number of mass points and a clue to the 2. question? center of mass system, momentum