New answers tagged evaluation
2
votes
Mathematica doesn't evaluate an expression
I think your expression E[t] inside Solve should be Exp[t]. Try this instead, where I ...
- 63.1k
2
votes
5
votes
How to Thread lists elementwise with the If function?
Inner is more suitable for this task then Thread.
...
- 41.7k
3
votes
12
votes
Accepted
How to Thread lists elementwise with the If function?
Thread doesn't hold its arguments unevaluated. In
Thread[If[#1 > #2, 1, 0] &[list1, list2]]
the "body", ...
- 8,628
3
votes
'Update' and how to use variables to define patterns in functions' arguments...?
If I'm understanding the semantics, you want to define testF as:
if the single argument matches the expression currently saved as $symbols, then return "It works!!!"; otherwise return "...
- 8,628
3
votes
'Update' and how to use variables to define patterns in functions' arguments...?
Perhaps better answers will come, but I have found two on my own:
The easy answer:
One cannot use 'variable patterns' ($symbols) 'directly' within the LHS of ...
- 1,335
1
vote
Replacement inside held expression
Trott-Strzebonski is great, but there is a case when some additional trick is required. At least I couldn't figure this out any other way...
Consider this slightly silly example. You have some ...
- 7,285
3
votes
Accepted
Replacing symbolic variables inside of a compile
It's not really an error, only a warning message, if w is atomic. It's not an error in the sense that w[[1]] is the result of <...
- 222k
2
votes
Replacing symbolic variables inside of a compile
This would fix the issue (it might not be the cleanest solution though)
...
4
votes
Preventing evaluation of $Exp[\pm i\pi]$ until the end of a calculation
Something like this?
ClearAll[f]
SetAttributes[f, HoldFirst]
f := Hold[Exp[I Pi]]
And once you want you can do
f // ReleaseHold
...
- 6,579
2
votes
Can every usage of While be changed into NestWhile?
One approach to change While to NestWhile is to incorporate variable increments, such as i++, as part the repeated function application. The idea of incorporating increments is similar to what Simon ...
- 1,286
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