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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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) ...
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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 ...
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0answers
61 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 ...
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1answer
85 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 ...
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0answers
34 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
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1answer
70 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
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1answer
81 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
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2answers
157 views

RSolve not reducing for a certain recurrence relation

I'm trying to use RSolve as follows to solve a recurrence relation: ...
3
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1answer
177 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? ...
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3answers
86 views

How to remove a line from the ListPlot?

Consider the following ListPlot: ...
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3answers
91 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 ...
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0answers
56 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
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1answer
167 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 ...
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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
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2answers
164 views

How to align the plot legends in the following way?

Consider example ...
5
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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 ...
3
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1answer
141 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 ...
8
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1answer
328 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....
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1answer
39 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
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1answer
80 views

ImplicitRegion evaluates the region incorrectly when it must be empty

Consider the following implicit region: ...
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0answers
61 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
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1answer
90 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
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1answer
132 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
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1answer
74 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'; ...
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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 ...
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0answers
100 views

FullSimplify of Dirac Delta Function failed

I have t1 and t2 whose difference should be 0. But ...
3
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1answer
83 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
42 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
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0answers
94 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
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1answer
79 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 ...
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0answers
77 views

Combine two options lists [duplicate]

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

Joined -> True works incorrectly for the given data set

Consider a set of data ...
0
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0answers
95 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
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1answer
152 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
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1answer
76 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 : ...
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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
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0answers
87 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
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1answer
69 views

When to expect increment to add 2? [duplicate]

I expected 3 from both of these ...
-1
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1answer
59 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
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2answers
217 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
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1answer
128 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
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2answers
234 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 ...
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0answers
72 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
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2answers
333 views

When to name a variable with $

There are some symbols in the Wolfram Language that start with $, including $Abort, ...
2
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1answer
199 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
60 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,...
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1answer
86 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 ...
0
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1answer
93 views

Compute inner product of using a double sum vector [closed]

I am struggling to create a vector in Mathematica to compute an inner product. The first vector whose elements are generated over the sum over $m$ is $$a = \sum_{m=0}^n\sum_{r=0}^m C_r a_m + \sum_{m=...
1
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0answers
101 views

List plot DataRange doesn't work [duplicate]

I have a set of coordinates for 0.4 < x < 5.6 and -10 < y < -4. When I use ListPlot, it plots the data in the ranges 0 < x < 5.6 and -10 < y < 0: I tried to use ...
1
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0answers
35 views

Trouble Plotting the maximum values of a function

First off, I apologize if this question is either incredibly obvious, or has been clearly asked and answered before. I've been searching the forum for a while, and the questions and answers thusfar ...