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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2
votes
1answer
51 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 ...
4
votes
3answers
261 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 ...
5
votes
1answer
61 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: ...
6
votes
1answer
171 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
1answer
70 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] ...
1
vote
1answer
28 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. ...
0
votes
1answer
39 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 ...
0
votes
1answer
63 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]...
1
vote
0answers
116 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
113 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
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
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0answers
48 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
3answers
51 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 ...
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/...
9
votes
3answers
195 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
105 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
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0answers
59 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
91 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 ...
4
votes
3answers
85 views

EntityValue timeline

I try to use EntityValue to get the returns of a stock from January 1st 2019 to today. When I use ...
0
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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
109 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 ...
0
votes
0answers
106 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 ...
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 ...
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
92 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
212 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
79 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
29 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
42 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
66 views

Defining iterative algorithms [closed]

Assume the iterative algorithm of interest to be as follows: ...
0
votes
0answers
28 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
0
votes
1answer
84 views

center of mass system, momentum

when I have systems with 3 mass points ($m_i, i=1,2,3$) to a time $t=t_0$ on positions $\vec r_i(t_0)$ and velocity $\vec v_i(t_0)$. How could a syntax look like to calculate 1) center of mass 2) ...
3
votes
0answers
46 views

Pure function: using T[[#]] where # indicates a position [duplicate]

When using T[[#]] in which # indicates a position, how do you pass on the position # (which ...
0
votes
0answers
60 views

Implementing a function that exhibits linearity

I am trying to define a function $\mathbb{E}_t$ such that $\mathbb{E}_{t}[f[x_{s}]] = f[x_{s}]$ if s<=t, and $\mathbb{E}_{t}[f[x_{s}]] = \mathbb{E}_{t}[f[x_{s}]]$ if s>t. $\mathbb{E}_{t}$ is ...
0
votes
1answer
75 views

Plotting the condorcet jury theorem [closed]

I am trying to create a simple plot of the condorcet jury theorem: The function is: F[n_,i_,p_]:=((n!)/((n-i)!*i!))*((p^i) *(1-p)^(n-i)) embedded in a sum ...
0
votes
0answers
32 views

Is there a difference between these two ways to define a function? [duplicate]

(I took this example from another question) f[0] = 0; f[n_] := f[n] = DigitCount[n, 10, 1] + f[n - 1]; f[1016] I notice that this example defines f(n) in a ...
1
vote
1answer
68 views

Harmonic number of $r$ with order $r$ [closed]

Mathematica recently offered me this expression as the result of an evaluation: HarmonicNumber[r, -r]. I initially thought this must be equivalent to ...
2
votes
1answer
78 views

How to fit dated stock market data with non-linear model fit?

I am new to Mathematica and I am currently doing a project on predicting stock market trends using log-periodic power law. I am trying to fit stock market data to the following equation. y(t) = A + B (...
4
votes
2answers
141 views

RSolve not reducing for a certain recurrence relation

I'm trying to use RSolve as follows to solve a recurrence relation: ...
3
votes
1answer
166 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? ...
-1
votes
3answers
74 views

How to remove a line from the ListPlot?

Consider the following ListPlot: ...
0
votes
3answers
86 views

Finding the integer terms of a binomial expansion [closed]

What functions can I use to find how many integer terms the following expression has? $$\left (\sqrt[19]{19}+\sqrt[95]{95}\right )^{1995}$$ Edit 1 In the development of that binomial, at some point ...
0
votes
0answers
53 views

magic square with prime numbers of any order

how could you create a script in Mathematica that generates magic squares of order n, but that the numbers that form the square are all primes I've looked at what's in other answers but I can not ...
3
votes
1answer
150 views

Using “?” to get function details has changed?

I'm running Mathematica 11.0 (I should upgrade, I know) and it used to be that if I entered something like ?Integrate, Mathematica would output basically a mini ...
0
votes
0answers
43 views

Define a new Front End Syntax for Function Argument Checking & Debugging

In this question I asked a basic question about how to check argument types such that there was useful output from the front end when calling functions. Based on elements of the nice answer by @j-m-is-...
3
votes
2answers
156 views

How to align the plot legends in the following way?

Consider example ...
5
votes
1answer
48 views

how to comfortably concatenate substitutions

Often I have to do perform a succession of substitutions on some expression, and in a notebook the way I know to do that is ...