Mathematica symbols are the ultimate atoms of symbolic data. Every symbol has a unique name, exists in a certain Mathematica context or namespace, and can have a variety of types of values and attributes.
1
vote
1answer
80 views
Longest string of special characters [closed]
I was answering a question the other day and my answer had several special characters in a row -- it was something like FindRoot[#, {2}] & /@ {f1, f2, f3} which ...
6
votes
1answer
92 views
Telling mathematica to output * instead of space for multiplication, so I can copy as plain text
I am trying to get some symbolic expressions in Mathematica
which I would like to paste into my C/MATLAB codes. This can be accomplished
nicely by selecting the expression and right-clicking to ...
3
votes
1answer
99 views
Manipulate a Plot that contains a variable that contains symbol
This snippet
mm = m
Manipulate[{mm, Plot[mm x, {x, 0, 1}]}, {m, 0, 1}]
(m is not defined anywhere) produces a sadly fixed ...
14
votes
5answers
370 views
How do I reassign canonical ordering of symbols?
I have a big polynomial that evaluates to:
$$A^2 e^2 \phi ^- \phi ^++A e \phi ^- \phi ^+ c_{2 w}
g_Z+\frac{1}{2} A e g h W^- \phi ^+ +\ll13\gg,$$
which is supposed to represent some terms in the ...
3
votes
1answer
97 views
FeynCalc “May shadow or be shadowed by other definitions”
So I've downloaded the latest FeynCalc from this site and put the extracted folder in user/me/library/Mathematica/application, but when I write the command
...
1
vote
2answers
171 views
How to define a vector with automatically added symbolic elements with subscripts
I want to define a vector lets say k containing elements Symbolize[Subscript[k, 1]], k2, k3 ... etc. When I define lets say k4 . I want the symbol automatically added to vector k. Something like ...
5
votes
1answer
271 views
Using the symbol I for electrical current [duplicate]
I would like to use the I as a symbol for the electrical current. How can I redefine it, so it is not interpreted as the imaginary unity?
2
votes
1answer
51 views
strange output from ToExpression
I want to set constraints to my parameters, e.g., "m", but Mma gives nonsensical output. How could I avoid this phenomenon by using another but "equivalent expression"?
Or, is this just in my computer ...
2
votes
3answers
140 views
How to make a defined symbol stay in symbol form?
How to make a defined symbol stay in symbol form?
w = 3; g = 4;
{w, g}[[2]]
3
I want the output to be ...
6
votes
1answer
97 views
Functions, Options and Symbols
In the normal Mathematica language, where no built-in symbols are redefined and no evil things happen, is it a valid assumptions, that no function symbol (Plot, ...
1
vote
1answer
69 views
How can one type a box with “x” marked?
In some text portion of my notebook, I would like to be write check boxes which are empty, check marked or "x" marked.
The following commands work for the first two:
...
27
votes
3answers
650 views
Is there an equivalent of MATLAB's Workspace window in Mathematica?
For example, in MATLAB, a panel is available where one can see straightaway which variables are used and their dimension sizes. Is such a feature available in Mathematica? I really find it hard to ...
4
votes
0answers
55 views
Is there a way to check whether two notebooks share the same variables?
When I code in Mathematica, I often re-use code from old notebooks which fulfilled a specific purpose; for example, one testing for soft matches in strings, or one that identifies outliers on a graph ...
2
votes
0answers
74 views
Transfer of symbols between contexts
As many others (I guess) I'm struggling with the handling of contexts within Mathematica. I'm working on a new package definition with the usual syntaxt specified by the Mathematica documentation:
...
6
votes
1answer
81 views
Go to definition of symbol/variable
Is there any easy way of directly jumping to the definition of a Variable like it is implemented in some good IDEs? Currently I have to search manually (ctrl+f) through the whole workbook to find it ...
13
votes
1answer
182 views
Is the sharing of variables in Module/Block within Compile documented behavior?
Today I noticed something, I think for the first time.
When used inside Compile variable values within Module (and ...
7
votes
3answers
134 views
How to set a TraditionalForm output for a symbol
How do I set a TraditionalForm output for a particular symbol/function?
In particular I would like my user-defined symbol ...
12
votes
6answers
338 views
How to clear all variables except one?
I have a lot of variables: $a,b,c,d, \ldots $
I want to clear the values of all of them except $b$. It's really lengthy to write
Clear[a];
Clear[c];
...
Is ...
3
votes
1answer
117 views
Using external variable as a variable inside WhenEvent & NDSolve
I'm trying to use the new WhenEvent functionality of NDSolve in Mathematica 9, in order to perform an action when a variable in the system reaches a certain value. I would like this variable to come ...
8
votes
1answer
110 views
Get the name of a symbol passed to a function
I'm trying to get the name of a symbol passed to a function with this:
f[x_] := {SymbolName[x], x}
SetAttributes[f, HoldFirst]
x = 5;
f[x]
But ...
4
votes
1answer
293 views
How to create symbol whose name has subscript?
I can do
Symbol["foobar"]
to create a symbol foobar. How to create a symbol $\theta_1$?
...
2
votes
2answers
287 views
Generating a vector of dummy variables
So I'm the situation of needing analytical solutions to a family of equations of the form Ax=b, where A is an nxn matrix. I've written a function that does what I want, but I'm currently using a bit ...
4
votes
2answers
90 views
Lesser and greater symbols in the axeslabels
I need a plot with $\Gamma^<$ as axeslabel using:
AxesLabel -> { $\Gamma^<$}
But I get an error.
AxesLabel -> { $\Gamma^{a<b}$} works though.
I think I've to tell mathematica that ...
15
votes
5answers
3k views
How do I clear all user defined symbols?
Is there some way to do this other than going to Evaluation -> Quit kernel and firing a new one up?
17
votes
2answers
707 views
How can I use the Klingon alphabet symbols?
Mathematica apparently supports the Klingon alphabet:
MemberQ[$CharacterEncodings, "Klingon"]
True
UnicodeFontMapping.tr excerpt:
...
5
votes
2answers
166 views
Delete contexts from a string representation of a symbol
I want to delete the string representing the context of a symbol.
For info I need such a functionality in my ShowIt function defined here
I'd like to know how I ...
18
votes
1answer
354 views
Local variables in Module leak into the Global context
From the Mathematica documentation on Module:
Module allows you to set up local variables with names that are local to the module.
But after using ...
7
votes
2answers
372 views
List of Mathematica textual symbols
Context
I am using Mathematica to create live documents - documents that are both interactive and show mathematical derivations. Now, I'm aware that there are certain symbols that are available via:
...
10
votes
2answers
268 views
Defining symbol shortcuts in the Front End
I was wondering (because I could not find any documentation on this) if it is possible to do shorthand abbreviations for domains or could one define them?
E.g.
In[1]:= Element[p,Complexes]
...
11
votes
5answers
624 views
How to pass a symbolname to a function with any of the Hold attributes?
Given a function with the attribute HoldFirst, HoldAll or similar, and a variable, list, how ...
22
votes
1answer
286 views
What is the story with Removed symbols?
The system function Remove evidently exists primarily to turn a fatal problem into an annoying one, by giving the user a (rather blunt) instrument with which to ...
0
votes
1answer
287 views
Symbolic Optimisation
I'm trying to solve symbolically the following optimisation:
$$
\min_{q_uu}\ \Biggl[ q_u q_{uu}\psi B_{uu} + q_u q_{ud}\psi B_{ud} + q_d q_{du}\psi B_{ud} + q_d q_{dd}\psi B_{dd}
$$
$$
+ ...
28
votes
2answers
677 views
Is there a way to separate variables between multiple notebooks?
I often correct homework by checking the calculations in Mathematica. Sometimes you would like to have two solutions open at once. However often defined symbols such as ...
8
votes
1answer
269 views
How to properly DumpSave & Get Global`s symbols inside packages while not touching Global context?
For efficiency reasons I prefer to use DumpSave instead of Save.
For ease of access I prefer to save symbols in ...
16
votes
2answers
321 views
Automated testing for compatibility with older Mathematica versions
I have several packages which I actively develop and maintain. I try to stay up to date with new releases of Mathematica and usually update within a couple of months of a new version coming out. As a ...
10
votes
2answers
367 views
How to unload automatically loaded packages?
I know that this has been discussed here (How do I clear all user defined symbols?), but my case is somewhat different. How does one unload packages during runtime that were loaded with the start of ...
2
votes
2answers
255 views
Single dot textual form
How do I render a letter with a single dot above it?
I see \[DoubleDot] and \[TripleDot] are readily available, but what about ...
10
votes
2answers
330 views
How do you programatically load data into symbols?
I am trying to convert a list of string names into symbols, which will then be used to store data. I have 24 files (where the name of each file is a member of the list mentioned above) that I need to ...
8
votes
3answers
153 views
How can I test properties of a symbol from the string name without the symbol completely evaluating
Suppose I have a few symbols, one of which has a value:
{abc1, abc2 = 5, abc3};
I can use Names to get the list of names, as ...
16
votes
4answers
480 views
How can I randomly generate a unique, unused symbol?
In a previous question on collecting terms for a multivariable polynomial, I answered with a solution that required a unused symbol to be used for a temporary substitution and back substitution.
It ...
