# 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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43 views

### Code not working when I'm breaking it up into different lines

The following code works perfectly For[i=1,i<4,i++,Print[i]] However, when I break this into different lines, it stops working. Moreover, the braces appear to ...
30 views

### what is the difference between /. and /; in mathematica? [duplicate]

What is the difference between /. and /; in Wolfram Mathematica How would you apply them both and what situations are each of them appropriate to use?
30 views

### ContourPlot a list of equations generated by the Table command

The first command below produces proper contour lines while the second command produces an empty plot. I would think that the two commands should produce the same output. What's going on? ...
85 views

### Adding plot options after @ in ListLinePlot [closed]

How can plot options like PlotLabel and PlotRange be added after @ in ListLinePlot? For example: ...
598 views

### Correct way of simplifying the result of an integral

Many times Mathematica gives enormous results to simple problems. One uses the program more for trouble than for not knowing how to solve the problem. As an ejemplo I present this integral that ...
1k 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 ...
465 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 ...
477 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 ...
36 views

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271 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 ...
83 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 ...
271 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 ...
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: ...
228 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 ...
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] ...
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. ...
47 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 ...
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]...
120 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 ...
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 ...
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....
54 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 ...
60 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 ...
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/...
202 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 ...
108 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) ...
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 ...
106 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 ...
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 ...
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 ...
114 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 ...
109 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 ...
138 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 ...
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 ...
97 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 ...
215 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 ...
87 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 ...
31 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 ...