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3
votes
2answers
129 views

What is the fastest way to get a list of subexpressions and their positions?

I have spent quite some time trying to figure out what the fastest way is to get a list lists of all subexpressions and their positions. I have tried things with MapIndexed, which seems ideal in cases ...
16
votes
3answers
312 views

What does None mean in a control specification for Manipulate?

I am now struggling to understand code that contains the following (simplified) Manipulate structure. ...
14
votes
3answers
163 views

What does `: Hold[$IterationLimit]` mean?

In this answer, what does the : Hold[$IterationLimit] part of the following construct do? ...
9
votes
2answers
2k views

What does # mean in Mathematica?

I asked Mathematica to compute the following Solve[c (1-x)^2-x^(1/4) == 0, x] and it returned this: x = Root[#1^8 c^4 - 8 #1^7 c^4 + 28 #1^6 c^4 - 56 #1^5 ...
0
votes
1answer
67 views

Substituting Data from File

I have sets of Diff. Eq. that I'd like to solve symbolically, then substitute in numerical values for some of the symbols. I'd like to store the value for each symbol in a file, e.g., an excel ...
8
votes
3answers
186 views

Functions that creates symbol in a specific context

I'm trying to make a function f that takes a symbol, a value, and a context, and creates the symbol in the requested context and assigns it the passed value. The ...
4
votes
1answer
405 views

Behavior of expression evaluation in Plot

I'm confused with Mathematica's way of parsing expressions. I've been struggling with this for a while and never found an exhaustive answer, sometimes things don't parse the way I think they would ...
1
vote
0answers
71 views
1
vote
2answers
69 views

Factor inside argument

How do you use Factor so that it will factor expressions inside the arguments of some bigger expression. For example Factor[ Cos[t w - t z]] gives ...
0
votes
0answers
63 views

Mathematica Workspace [duplicate]

Possible Duplicate: Is there equivalence within Mathematica to view currently used variables similar to Matlab? In Matlab, I can type: ...
18
votes
1answer
422 views

Using Transpose with a list as the second argument

I'm having difficulty understanding the Transpose function. I know what the transpose of a matrix is, not a problem, and I see that applying the ...
13
votes
3answers
339 views

Make mathematica treat $e_i^2$ as numeric

With NumericQ[symbol] = True, I can declare that a symbol is numeric. I want the expressions matching: $$e_{\text{i$\_$}?\text{IntegerQ}}^2$$ to be treated as ...
2
votes
1answer
132 views

Difference between function definitions [duplicate]

Possible Duplicate: Functions vs. patterns I thought about describing the context in which I faced this problem, but I figured it is general enough and clear enough to pose it as it is. ...