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.

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0
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1answer
43 views

Append subscript to variable name [duplicate]

I'm importing equations from Word document and transforming them into input form. But subscripts look ugly. Is is possible to programmatically append subscript to variable name? e.g. ...
0
votes
0answers
37 views

What does K[1] represent? [closed]

I am trying to solve this recurrence relation: RSolve[a[n]==k*a[n-1]+t[n], a[n], n] Mathematica returns: $\left\{\left\{a(n)\to j^{n-1} \left(\sum ...
3
votes
2answers
159 views

Replace every Minus to Plus in Expression

Thought this is a rather simple thing, but I was not able to find a solution: I have a polynomial expression like: expr1=a^2-b+c*d expr2=a-b expr3=-a+b-c and ...
18
votes
5answers
582 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 ...
0
votes
1answer
46 views

Why won't Manipulate work with symbols generated by Symbol?

Suppose I am provided with two data lists. (Assume for the moment that they are lists of integers.) I would like a function that generates bar charts that I can manipulate. Here is what I have: ...
1
vote
0answers
86 views

Auto-complete for user defined functions [duplicate]

If I define a symbol in Mathematica, it doesn't show up in the autocomplete list that works for symbols in System. Test code: ...
4
votes
3answers
191 views

Running out of variables

I am running symbolic calculations with Mathematica. Simplification of algebraic expressions is an important part of them as very often final results can be simplified considerably. Typically my ...
3
votes
2answers
115 views

Stopping a head from evaluating more than once

While attempting to answer my own question, Is there a way to "hold" prefix / infix / postfix notation?, I came across the need to evaluate a recursive function only one level deep. For ...
15
votes
0answers
143 views

Are greek symbols causing different evaluation?

I've updated today to Mathematica 9.0.1.0 from version 8 and found something that absolutely confuses me. Let us define a piecewise function: ...
7
votes
1answer
208 views

Defining my own invisible operator

There are some invisible operators in Mathematica (\[ImplicitPlus],\[InvisibleTimes],...
0
votes
0answers
40 views

Explicit multiplication * sign in Mathematica [duplicate]

I need to turn my Mathematica output (in string form) to a form that I then need to feed to Maple, and specifically I'd need all multiplications to be marked by * (as opposed to x or, as it happens ...
14
votes
2answers
161 views

How to find the package file that stores a certain symbol?

Is it possible to figure out in what file a certain packaged symbol lives in (assuming there is no shadowing between multiple identical symbol names)? I would like to have a function that if, given a ...
1
vote
3answers
69 views

Assigning symbolic operators to built-in functions

Can I do something like this: $$\partial_t = D[f, t]$$ i.e. create a symbol instead of a function so that each time I call it, it executes the operation as defined?
3
votes
1answer
106 views

Dynamic generation of Buttons

The Project I am trying to dynamically turn on/off the display of data for a circos-esque plot that I generated. The Code I have data stored in mfData and a ...
3
votes
2answers
106 views

How to open directly the help/reference window from a notebook

I'm used to do ??symbol when I want the reference for a given symbol, then I click on the >> arrows to open the help window. Would it be possible to ...
1
vote
1answer
77 views

Experiment with TagSetDelayed involving Part

Reading Associating Definitions With Different Symbols, I was intrigued by this: You can think of upvalues as a way to implement certain aspects of object-oriented programming. A symbol like ...
6
votes
1answer
50 views

How to reset the $ModuleNumber?

According to the documentation, we can reset $ModuleNumber to a positive machine integer. There is even an example in the doc: ...
23
votes
2answers
1k views

How can I use the Klingon alphabet symbols?

Mathematica apparently supports the Klingon alphabet: MemberQ[$CharacterEncodings, "Klingon"] True UnicodeFontMapping.tr excerpt: ...
10
votes
2answers
471 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 ...
0
votes
2answers
115 views

Getting new symbols into Mathematica

What is the easiest way get new symbols into Mathematica 9? For example I want to be able to write the Symbol \mathfrak{A} that you have in Latex. I know that ...
0
votes
1answer
86 views

How can I type "aprox symbol in Mathematica? [closed]

I want to obtain a value of the Normal Distribution, but I can´t type "approx symbol" before Normal Distribution" to tell Mathematica that x FOLLOWS N[0,1] How can I do it? Probability[z >= 8.49, z ...
4
votes
0answers
206 views

Whats the best practice of using subscripts in symbols?

I have stumbled over several issues about subscripted symbols recently. I would like that I can enter subscripted variables with my keyboard and that they are treated as symbols. I would also like to ...
1
vote
0answers
129 views

Symbol with Subscript but no quotes in it!

If I use the following function to define me a fancy subscript: ...
30
votes
1answer
687 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 ...
2
votes
2answers
72 views

How to make a function work on symbols in a specific context

Let us say we have two sets of symbols $(x, y, z)$ with the same names that live in two different contexts: ...
7
votes
3answers
566 views

Guidelines on giving readable names to variables [closed]

I know that one cannot use underscore to a variable name, like degree_of_The_First_Polynomial. But for a long variable name, it ...
6
votes
2answers
208 views

Not FullDefinition for Save. MachineID not Protected?

Is there a way to set what symbols's definitions I do not want to store? Consider the following code: ...
0
votes
3answers
178 views

Given a Boolean representation of a system, how can the Reliability Function be displayed as symbolic algebra?

Can Mathematica 9 convert a Boolean representation of an RBD to its symbolic algebraic form? If I have a simple series Reliability Block Diagram made up of 2 components, c1 and c2 bexpr1=And[c1,c2] ...
3
votes
1answer
95 views

Displaying the meaning of an operator using Information

I'm using CircleTimes ($\otimes$) operator defined as a_\[CircleTimes]b_ := KroneckerProduct[a, b] so I can use ...
4
votes
1answer
88 views

Remove Removed From Output

How might I remove Removed[..] symbols from the output of an expression? For example Clear[b]; b := Sin[a + a]; Remove[a]; b ...
1
vote
4answers
214 views

converting between forms - symbols/subscripts - matrix products

If I have a vector of the form (xp+y, x+yp) do you have a simple way of creating the following matrix and vector from it: {{p, 1}, {1, p}} * {x, y}, such that ...
1
vote
0answers
30 views

Symbol created in unevaluated second argument of If [duplicate]

Apologies for the long question title, but I couldn't come up with something shorter to describe the following. Starting with a clean session, there are no symbols in, let's say, ...
4
votes
2answers
190 views

Using Greek letters with subscripts as symbols

I'd like to use Subscript[ϕ, 1] as a function name: Subscript[ϕ, 1][x_] = C1 + C2*x + C3*Exp[α*x] + C4*Exp[-α*x] But as I use ...
4
votes
1answer
181 views

Manipulate a Plot that contains a variable that contains symbol [duplicate]

This snippet mm = m Manipulate[{mm, Plot[mm x, {x, 0, 1}]}, {m, 0, 1}] (m is not defined anywhere) produces a sadly fixed ...
8
votes
1answer
125 views

Is it possible to write a function immune to symbol redefinitions in any Block surrounding its invocation?

Normally, semantics of symbols used in a function definition can be changed by their redefinitions in Blocks surrounding the function invocation: ...
13
votes
3answers
192 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 ...
19
votes
5answers
1k views

How to pass a symbol name to a function with any of the Hold attributes?

Given a function with the attribute HoldFirst, HoldAll or similar, and a variable, list, how ...
2
votes
1answer
164 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
196 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 ...
4
votes
1answer
455 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
295 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
373 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
90 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
168 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 ...
5
votes
1answer
118 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
115 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
944 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
72 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 ...