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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.

1
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1answer
87 views

Rotation in physics

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
36 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
53 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
76 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
37 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
58 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
66 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
28 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
59 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
68 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
79 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
136 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
52 views

How to remove a line from the ListPlot?

Consider the following ListPlot: ...
0
votes
3answers
81 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
42 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
126 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
39 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
126 views

How to align the plot legends in the following way?

Consider example ...
5
votes
1answer
40 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
76 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
180 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
29 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
60 views

ImplicitRegion evaluates the region incorrectly when it must be empty

Consider the following implicit region: ...
2
votes
0answers
51 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
66 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
111 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
63 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
41 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
64 views

FullSimplify of Dirac Delta Function failed

I have t1 and t2 whose difference should be 0. But ...
3
votes
1answer
76 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: ...
0
votes
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
87 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
41 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
49 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 ...
1
vote
1answer
63 views

NDsolve and Coupled first order ODE solving [closed]

I am new to this community and also to Mathematica. I am trying to solve a set of coupled first order differential equations related to the shape of a liquid drop. The code is as follows : ...
1
vote
0answers
21 views

Need explanation for specific expression syntax that starts with an integer and a period [duplicate]

I have a Table statement that I don't understand: ...
1
vote
0answers
86 views

“What is” command in Mathematica [duplicate]

I'm looking for "What is" command in Mathematica. For example, the command WhatIs[function[x]] gives a definition of the function given anywhere in the notebook or generally in kernel. Could anyone ...
3
votes
1answer
51 views

When to expect increment to add 2? [duplicate]

I expected 3 from both of these ...
-1
votes
1answer
55 views

Operations between sets of integers [closed]

sorry it was impossible to put the code in Latex, he said that there were problems of indentation, I put the image
4
votes
2answers
166 views

Mathematica syntax with combined Prefix and Times operator: @* [duplicate]

In a post on the Mathematica Community, Anton Antonov uses a syntax that I have never seen. It is the prefix function @ combined with the Times operator *. The combination appears to bind the ...
6
votes
1answer
122 views

Is (x|y|…)∈set the same as x∈set&&y∈set&&…?

I've sometimes seen that this operator is used to specify that each of given variables is in some set, e.g. Reals. Like ...
5
votes
2answers
222 views

Where to look up information about some symbols, such as “,”, “[” and “]” (not string)?

Searching { in F1 documentation, one at least gets an item for List. But the same thing is not happening for ...
1
vote
0answers
63 views

Run function as loop over two matrices

I'm still wrapping my head around Mathematica syntax. I have a matrix clustersAll that looks like ...
17
votes
2answers
313 views

When to name a variable with $

There are some symbols in the Wolfram Language that start with $, including $Abort, ...
2
votes
1answer
111 views

Evaluating functions out of expressions stored in list

I have a method that takes an integer $n$ and returns a list of variables vars = {x1,...,xn} and down the line a list of expressions in $x_{1},\cdots,x_{n}$ is ...
3
votes
1answer
46 views

Manipulate's LocalizeVariables and initial values of variables

Manipulate[a, {{a, 0.25, "label"}, 0, 1}, LocalizeVariables -> False] The initial value is then set to 0. On the other hand,...
1
vote
1answer
72 views

Why do I need a second Function in SortBy for Association?

I cannot understand why I need a second pure function when trying to sort Association by Key. Here is an example ...