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15 votes
3 answers
1k views

substitution rules excluding subscripted variables

Suppose I have an expression containing p,Subscript[p,1],Subscript[p,2],etc. I want to replace p with a numerical value while keeping the other two variables intact. How can I do it? If I naively use …
wdg's user avatar
  • 1,189
1 vote
0 answers
54 views

plot[] with subsititution rule [duplicate]

I encounter this problem in Mathematica 9.0.1, I'm not sure if it ever happens in other version. Plot[{x, x + 1}, {x, 0, 10}, PlotStyle -> {Red, Green}] This will show a red curve and a green curve …
wdg's user avatar
  • 1,189
3 votes
1 answer
197 views

obtaining real roots of negative numbers in a long expression [duplicate]

I only need the real root after replacement, but Power[] function in Mathematica most of the time gives me a complex number instead. … (it seems that realPower only work with numerical values) What should I do to get only the real root after replacement? …
wdg's user avatar
  • 1,189
10 votes
1 answer
728 views

error when defining a compiled function with ReplacePart

I always have difficulty in writing a non-trivial compiled function. I'm using Mathematica 9. Please see the following code Clear[longtermCompiled]; longtermCompiled = Compile[{{M, _Real, 2}}, …
wdg's user avatar
  • 1,189