Tagged Questions

Questions on the use or manipulation of *Mathematica* variables (i.e. names associated with a changeable value). Use [variable-definitions] or [assignment] for questions on variable context localization, or assignment.

42 views

Can you unpack a list of values into variables in a With expression?

For instance, if I am trying to draw a graph with 5 vertices labeled a through e, and I want to draw edges connecting a and b, a and c, a and d, a and e, b and c, b and d, and c and e, I would run the ...
103 views

56 views

Create a list of variables of a function

How can I create a list of variables of simple functions with arguments? These functions will be defined by the user, to be manipulated with some code later. ...
31 views

How to list all user-defined variables with current values? [duplicate]

How to get a list of all user-defined variables and those current values in the current .nb? Maybe it's a (too) simple question, sorry if so, but the answer would help me a lot in debugging some ...
236 views

Duplicate Mathematica functionality in Mathematica clone or lisp [closed]

What is the easiest way to accomplish the following in a Mathematica clone or in any version of Lisp? Also it doesn't appear in any lisps have a similar replace function. ...
220 views

How to make Mathematica express an equation in terms of previously defined functions

I was given a problem for my physics class, and perhaps I have taken it too far, but I wish to finish what I started. I have a function (i warn you that this does not look pretty) ...
59 views

Global variables [closed]

I have a workbook I am writing, there are 2 cells in it and then each cell is divided into sub cells. At the top of the first cell i made a bunch of variable assignments such as length=10, x=6, d=4, ...
73 views

Assiging random values to an array of variables [closed]

I want to create a number of variables and assign random values to them. This is possible in Python using a single line of command. To be more specific say I want to create 10 variables whose value ...
55 views

How to give more importance to a variable in a chart

I have two variables, x and y. x goes from 0 to 10, 10 being best. ...
40 views

How to avoid import evaluation until if wil return true

My goal is to import a data from url that depends of 1 parameter, this initialy value is null or undifined en yo have to selec some popup and then the variable has value, what is the method to do that?...
163 views

Adding letters and numbers to create a variable name [duplicate]

Let's say I have several variables, named R1, R2 and R3. I wanted to have a function ...
53 views

Defining a function which takes lists as it arguments and threads over them [closed]

I want to define a function with lists as variables, which has the form like m = Table[2, {i, 5}]; f[x_, y_] = m*x + x*y; x and y are list variables; m is a ...
71 views

How to choose variables of specific form

I am trying to work on a problem with a probability distribution. I wanted to get the result in analytical form. Suppose I need to keep p1, p2, p3, p4 variables such that p1+p2+p3+p4=1; How to use ...
108 views

Is it possible to find the size of a variable in a notebook?

I have a fairly large a list of matrices matsLst, which takes about 15 minutes to compute (but computes successfully each time). I can test in the notebook that ...
314 views

How to use Table to assign values to variables in a list?

I'm trying to do the following: R = {a, b, c, d, e, f, g, h, i}; Table[R[[n]] = RandomInteger[{0, 20}], {n, 1, Length[R]}] My intention is to assign a random ...
40 views

Symbol-handling, force-replace instanced variables within functions! [duplicate]

Currently I am stuck with the issue of renaming an instanced variable like r1\$23314 to a global one. This issue arises as I need to use a "localizeAll" Module in ...
49 views

Need help with notations [duplicate]

I can't create a custom variable with notation. Where is my problem? I have a big computation and I need to convert it to LaTeX. ...
86 views

Plotting data with four variables; two labels for one of the axes [closed]

I am having difficulty related to 3D plotting task. I have a set of data points in the following form : ...
126 views

Printing names of indexed variables instead of values

I'd like to display only the variable (indexed variable) name (in symbol form, not in string form) instead of its value in Mathematica. Say I have a variable foo[i] ...
89 views

Can i change AutoStyles colors for undefined variables?

I want to change from blue to red the color of the undefined variables; but only for the current Notebook
65 views

Can I name a variable as D(1,0,+1/2)? [closed]

I am trying to use variables with names as D(0,0,0), D(1,1/2,+1/2), etc. but I don't know how to do it.
78 views

Is it possible to assign a value where the target is itself a variable

If I have a variable x := "a". Is there a way I can use it to assign a value to a, by just referring to ...
97 views

Change of variables—Galilean transformation

I have a function of two variables, f[x, y], and I wish to do a Galilean transformation, i.e., y = z - v t, where ...
135 views

How to specify the domain of a variable?

How can I specify for every expression the domain of a variable without using assumptions everytime i have to simplify it?
93 views

How to make strong assumptions?

Or put in another way, how to make a variable behave as it belongs to a specific domain, even outside the use of simplify or other commands alike? For example: ...
84 views

Variable change

If I have the following Hamiltonian: ...