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 Apr 13 comment Strange Integrate messages / \$RecursionLimit being ignored For odd n -> 1/2^n Pi Tr@ Table[Binomial[n, Floor[n/2] - j ] BesselJ[0, 2 j + 1], {j, 0, Ceiling[n/2]}] Apr 13 comment Fixed colors for fixed values in contourplot legend Use ColorFunction -> ColorData[{"Rainbow", {0, 3}}], ColorFunctionScaling -> False on both plots Apr 13 comment Plotting six chosen rows of a matrix @johnhenry Please try the code with Wab = RandomReal[{0, 1}, {n, n}]; . If it works .... it's your matrix :) Apr 13 comment Plotting six chosen rows of a matrix @johnhenry Then your W isn't a 4x4 (or larger) matrix ... Apr 13 revised Plotting six chosen rows of a matrix deleted 21 characters in body Apr 13 answered Why NDSolve cannot solve such a simple set of differential equations? Apr 13 answered Plotting six chosen rows of a matrix Apr 13 revised Why NDSolve cannot solve such a simple set of differential equations? added 25 characters in body Apr 13 reviewed Close Consistent Graphics3D object size from different view points Apr 13 comment How to draw a tropical surface? Perhaps fns[u_, v_, w_] := {u, v, w, 0}; k = 20; RegionPlot3D[ First@Differences[Sort[fns[u, v, w]][[1 ;; 2]]] == 0, {u, -k, k}, {v, -k, k}, {w, -k, k}, PlotPoints -> 50] Apr 13 comment Complex numbers from two arrays with Real and Imaginary parts 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! Apr 13 comment Complex numbers from two arrays with Real and Imaginary parts Complex @@@ (Transpose@{re, im}) Apr 12 answered Vector Plot of a linearly varying cantilever Apr 12 revised Vector Plot of a linearly varying cantilever deleted 19 characters in body Apr 12 reviewed Close Create an array with certain conditions and use it to fill a matrix Apr 12 comment Changing the ExtrapolationHandler Function in Any Interpolation @MichaelE2 Thanks! Apr 12 comment Changing the ExtrapolationHandler Function in Any Interpolation @MichaelE2 I used If[ ] just because of its fourth argument Apr 12 revised Changing the ExtrapolationHandler Function in Any Interpolation added 14 characters in body Apr 12 answered Changing the ExtrapolationHandler Function in Any Interpolation Apr 12 comment How can I generalize this interpolation function? What is an i-number?