# 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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### 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) ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 (...
157 views

### RSolve not reducing for a certain recurrence relation

I'm trying to use RSolve as follows to solve a recurrence relation: ...
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? ...
86 views

### How to remove a line from the ListPlot?

Consider the following ListPlot: ...
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 ...
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 ...
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 ...
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-...
164 views

### How to align the plot legends in the following way?

Consider example ...
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 ...
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 ...
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....
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 (...
80 views

### ImplicitRegion evaluates the region incorrectly when it must be empty

Consider the following implicit region: ...
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, ...
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?
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 ...
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'; ...
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 ...
100 views

### FullSimplify of Dirac Delta Function failed

I have t1 and t2 whose difference should be 0. But ...
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: ...
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 ...
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 ...
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 ...
77 views

### Combine two options lists [duplicate]

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

### Joined -> True works incorrectly for the given data set

Consider a set of data ...
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. ...
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 ...
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 : ...
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: ...
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 ...
69 views

### When to expect increment to add 2? [duplicate]

I expected 3 from both of these ...
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
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 ...
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 ...
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 ...
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 ...
333 views