Tagged Questions

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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0answers
48 views

Usage of @ symbol in Mathematica [duplicate]

What is the purpose of @ symbol? Also, I would appreciate if somebody could provide a webpage where such functional special symbols are documented
0
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1answer
15 views

Numeric-type attributes for symbols (analog of NumericFunction)

Is there an attribute for symbols that makes NumericQ give True? For example Pi and ...
2
votes
1answer
57 views

Equivalent command to the Maple indets command

This carries on the discussion here and here. I had mistaken Variable[] to give you ALL variables in an expression, but apparently, it is not meant for that. ...
0
votes
1answer
67 views

About Symbolize and Variables

I do believe this sort of similar questions had been asked many times, so I have read a LOT. For example this and this as well as many other related posts. But a glance at what my main question is ...
1
vote
1answer
63 views

Symbolize Subscript doesn't work

I want Mathematica to interpret subscripted variables as symbols. I found documentation suggesting the Notation package could do this, but if I do: ...
3
votes
1answer
104 views

Is undocumented \.bd = ½ bad to use?

I want to use \.bd which leads to ½ as part of the name of a symbol in the front end (e.g. ...
3
votes
0answers
52 views

How to get Symbol[“x”]=3 to work [duplicate]

This is probably a really simple one, but I'm stumped. I want Symbol["x"]=3 to work just like x=3. However I can't figure out ...
13
votes
1answer
279 views

Is garbage collection broken in version 10.0.0?

Bug introduced in 10.0.0 and fixed in 10.0.1 In version 10.0.0 under Windows I am observing the following behavior: ...
2
votes
0answers
46 views

Is there any way to get Times displayed as $\cdot, *,$ or $\times$ in output form? [duplicate]

In the output of Mathematica, operators $\cdot$ or * or $\times$ are usally displayed as space; e.g., $x * y$ becomes $x \, y$ in output. Is there any option that can be set to make "space" becomes ...
0
votes
0answers
75 views

Displaying subscripted symbols with TraditionalForm

I have pasted this code in from Mathematica 10 ...
7
votes
1answer
106 views

How to convert \[Formal…] symbols to standard ones in an expression?

Mathematica generates an expression sometimes using \[Formal] symbols. This is causing a problem with the TeXForm code generated ...
2
votes
3answers
189 views

How to create a writable and clearable symbol? [duplicate]

I'm trying to create several symbols and assign values to them. Here's what currently appears to work: Evaluate[Symbol["fdds" <> ToString[10]]] = 1 But ...
3
votes
1answer
74 views

Symbolic Output after numerical computation

I have a small question about the symbolic output. I started to write a program that generates the coordinates of n-dimensional polytopes by Wythoff construction. For crystallographic groups, all is ...
2
votes
1answer
44 views

How to joint symbolic expressions together [duplicate]

I want to joint symbolic expressions together to create a another symbolic expressions. one way to do that is as follows: ...
0
votes
1answer
87 views

Some Characters From Custom Font Do Not Show Up

I'm using version 8.0.4.0 on a Mac, and recently made my own .otf and .ttf fonts at PaintFont.com. The font can be based on pretty much anything, including handwriting, and covers everything from ...
2
votes
1answer
132 views

What's the difference between variables with and without a subscript?

If I input $x = a + b$, the $x$, $a$ and $b$ are blue. When I hit Shif+Enter, the $x$ turns black, indicating the kernel now knows this variable. But when I input $x_r = a + b$, and hit Shift+Enter, ...
0
votes
1answer
55 views

Optimizing repeated function calls

Easiest way to keep my library nice, is to naively call some functions many times with same parameters. Doing so prevents from zoo of (library-)global variables and complicated initialisation ...
1
vote
1answer
86 views

Unevaluated symbols [duplicate]

I often find it useful to define a symbol from strings (often in a loop in which I define other symbols). This I accomplish with Symbol (and often ...
0
votes
1answer
93 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. ...
3
votes
2answers
200 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 ...
0
votes
1answer
56 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
91 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: ...
3
votes
2answers
142 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 ...
19
votes
0answers
235 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: ...
0
votes
0answers
41 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 ...
2
votes
3answers
83 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?
7
votes
1answer
233 views

Defining my own invisible operator

There are some invisible operators in Mathematica (\[ImplicitPlus],\[InvisibleTimes],...
3
votes
1answer
129 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
127 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 ...
4
votes
3answers
246 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 ...
1
vote
1answer
86 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
62 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: ...
0
votes
2answers
129 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
111 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 ...
5
votes
0answers
271 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 ...
2
votes
0answers
162 views

Symbol with Subscript but no quotes in it!

If I use the following function to define me a fancy subscript: ...
2
votes
2answers
82 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: ...
9
votes
3answers
1k 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 ...
3
votes
1answer
111 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 ...
6
votes
2answers
215 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
199 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] ...
5
votes
1answer
118 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
262 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
31 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
295 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 ...
8
votes
1answer
140 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: ...
15
votes
2answers
178 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 ...
8
votes
2answers
326 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 ...