Dr. belisarius
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 Oct 16 revised Need help understandig the output of DSolve edited tags Oct 16 comment Need help understandig the output of DSolve It's probably artifact due to the lack of information about the integrability of 1/f^2 Oct 16 answered How to open *.sif files with Mathematica Oct 16 revised Swap LHS's (or equivalently RHS's) of two rules in a list added 76 characters in body Oct 16 answered Swap LHS's (or equivalently RHS's) of two rules in a list Oct 16 comment How can I handle interface thermal boundary conditions? Welcome to Mathematica.SE! I suggest the following: 0) Browse the common pitfalls question 1) As you receive help, try to give it too, by answering questions in your area of expertise. 2) Read the faq! 3) When you see good questions and answers, vote them up by clicking the gray triangles, because the credibility of the system is based on the reputation gained by users sharing their knowledge. Also, please remember to accept the answer, if any, that solves your problem, by clicking the checkmark sign! Oct 16 comment How could I perform this replacement? Please beware that Times is Orderless, so your expression could get reordered automagically Oct 16 comment Swap LHS's (or equivalently RHS's) of two rules in a list Can't check right now, but it looks OK. +1 Oct 16 comment Swap LHS's (or equivalently RHS's) of two rules in a list swapRulesA[{a -> b, c -> a, b -> c}, 1, 2] Oct 16 comment Swap LHS's (or equivalently RHS's) of two rules in a list The order of application alters the result, so swapping the LHS is not always equivalent to swap the RHS Oct 15 comment How could I perform this replacement? @march katlas.org/wiki/Setup Oct 15 revised evaluation of the sum of KroneckerDelta added 1 character in body Oct 15 comment How could I perform this replacement? Quite a strange requirement. Do you mind explaining why do you want to do this ? Perhaps there is a more standard way ... Oct 15 answered Solving a system of vector equations Oct 15 comment Solving a system of vector equations What kind of beasts are your conc[ ] supposed to be?Lists? Reals? Oct 15 comment Find Values of a and b for a Limit From f[x_] := (Sin[a*x] + (b*x))/x^3, Series[f@x, {x, 0, 3}] you may see that b == -a Oct 15 comment Find Values of a and b for a Limit f[x_] := (Sin[a*x] - (a*x))/x^3; Limit[f[x], x -> 0] Oct 15 comment Creating a random complex univariate polynomial See for example RandomVariate, Dot and Array or FromCoefficientRules Oct 15 comment Plot3D is incorrectly returning “1/0. encountered” Not just there ... Reap@Plot3D[(Sow[{x, y}]; 1/y), {x, 0, 1}, {y, x + 1, x + 2}] Oct 15 comment Eigenvalues of a large matrix