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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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0answers
28 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
88 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 ...
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0answers
49 views

What does the '.' in the following code mean? [closed]

Int[x_^m_.,x_Symbol] := x^(m+1)/(m+1) /; FreeQ[m,x] && NeQ[m,-1] What does the '.' in 'm_.' mean? The rest of the syntax makes sense. the '.' confuses ...
0
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0answers
97 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
116 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
77 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
205 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
68 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
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0answers
27 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
40 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
62 views

Defining iterative algorithms [closed]

Assume the iterative algorithm of interest to be as follows: ...
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0answers
23 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
97 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
39 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
64 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
80 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
1answer
44 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
69 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
30 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
62 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
71 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
108 views

RSolve not reducing for a certain recurrence relation

I'm trying to use RSolve as follows to solve a recurrence relation: ...
2
votes
1answer
142 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
57 views

How to remove a line from the ListPlot?

Consider the following ListPlot: ...
0
votes
3answers
84 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
46 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
130 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
40 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
138 views

How to align the plot legends in the following way?

Consider example ...
5
votes
1answer
43 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 ...
3
votes
1answer
82 views

Use of semi-colons in If[]

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 ...
6
votes
1answer
211 views

Solve PDEs with finite difference scheme by modifying NDSolve-based solver

Motivation As discussed here, NDSolve uses different difference orders for various spatial derivatives and the implicit design could cause trouble in certain cases....
1
vote
1answer
30 views

Replace function arguments multiple times?

I have a very large function f[x_,y_,z_] and it's too cumbersome to type it directly. So I wish to break the definition and use (...
1
vote
1answer
62 views

ImplicitRegion evaluates the region incorrectly when it must be empty

Consider the following implicit region: ...
2
votes
0answers
52 views

How do decrease uncertainty of Monte-Carlo integration?

I have some function of many arguments and need to integrate it over the region given by the products of Heaviside theta functions. Namely, I write, say, ...
3
votes
1answer
68 views

Own markers on the axis of the plot

Could you please tell me how to make the ticks on the axes not in the numeric form (say, 0, 0.1, 0.2) but in symbolic form (say, "zero", "zero point one" and so on), in the plot command?
3
votes
1answer
115 views

Force a function to report argument type mismatches

As a relative newcomer to Mathematica, I am still frequently caught out by coding errors that, at least by default, MMA does not indicate to the front end, in particular when I define a function and ...
1
vote
1answer
68 views

Evaluating an expression on one line

Is it possible to evaluate an expresson on one line? I have a linear algebra problem to re-write the straight line $-x=1-3y=-1-2z$ to a 'vector form'; ...
1
vote
0answers
42 views

Mathematica is acting as though d is a variable when it isn't [closed]

I have the Airy Stress Function ϕ[x_, y_] = 1/120 (P/(d^3))[5*(x^3 - x*L^2)*(y + d)^2*(y - 2*d) - 3*x*y*(y^2 - d^2)^2] That I need to take 2nd and 4th ...
0
votes
0answers
74 views

FullSimplify of Dirac Delta Function failed

I have t1 and t2 whose difference should be 0. But ...
3
votes
1answer
77 views

Application example of RuleDelayed in options

In this question: Options which require RuleDelayed , an example was given, where the an option has to be given as a RuleDelayed: ...
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0answers
41 views

How to use === with condition?

I have two expressions, and they are same when k is positive and x is non-zero real number. Below code gives me ...
8
votes
0answers
89 views

What is the philosophy behind \[Rule] (a.k.a. `->`) for assigning options?

Today I was banging my head against my desk when I realized that the problem I was experiencing was due to having typed ImageSize[Large] instead of ...
1
vote
1answer
78 views

What resources can I use to become familiar with high level syntax?

I was reading a question about dropping higher order terms and realized that I have a serous gap in knowledge when it comes to the finer points of mathematica computational programming. Are there any ...
1
vote
0answers
72 views

Combine two options lists [duplicate]

I have 2 functions Top and Bottom that each have an options list parameter. ...
2
votes
1answer
95 views

Joined -> True works incorrectly for the given data set

Consider a set of data ...
0
votes
0answers
58 views

Hyperbola ContourPlot missing input

I'm trying to plot a hyperbola using ContourPlot, but I can't understand what I'm missing on its call. The error says it's incorrect syntax, although I can't see any errors. ...
0
votes
1answer
53 views

If without else [closed]

The syntax for If is: If[condition, then, else] Which is the correct syntax for the case in which there is no ...