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 May24 answered Inverting a Spline-Function (Bezier or BSpline) May24 comment Mapping multiple functions @PinguinDirk MapThread! :) May24 comment Constraining solution's sign with NSolve @pablo With FindRoot you must provide starting values, seeds. You may want to automate that. See this answer which also links to such function FindAllCrossings2D[] in particular. May24 answered Constraining solution's sign with NSolve May24 comment Constraining solution's sign with NSolve @pablo You may switch to FindRoot. How would you specify x > 0 then? May24 comment Constraining solution's sign with NSolve Solve everything and then Select desired solutions? May24 revised Mapping multiple functions deleted 19 characters in body May24 comment Embed Code Into Image If image is intended for web and HTML only, you can write its code in the alt or title attribute of img tag. May24 answered Mapping multiple functions May21 comment extracting the rows of a matrix satisfying a condition (e.g. all elements negative) @Mr.Wizard 0.093601 May20 comment extracting the rows of a matrix satisfying a condition (e.g. all elements negative) @Mr.Wizard It must be clocking and a newer model I guess, mine is a bit old already (2009) and running at 2.93 GHz. My times are {0.952, 0.0780, 1.84, 2.04} which make approximately same ratios as yours, somewhere 10 : 1 : 25 : 30. P.S. Pick with UnitStep is the fastest here with 0.047. May20 comment extracting the rows of a matrix satisfying a condition (e.g. all elements negative) I'm curious, what computer do you run? For Pick picks a second almost on my i7 (+ Win7 and Mma 9). Can I tweak my system any towards the performance of yours? Another slower method, by a factor of 3.5 with my timing, is to: Scan with levelspec {-2} and Sow rows with negative third element. May18 comment How to get a solution set of a nonlinear system of equations? @J.M. Yes, that's a truly great post and discussion. Should a beginner be pointed to a post like that however, it could scare him s******* easily, no? May18 answered How to get a solution set of a nonlinear system of equations? May17 revised Tricky selection of elements based on their position added 160 characters in body May17 answered Tricky selection of elements based on their position May17 accepted NDSolve with vector function May15 revised NDSolve with vector function added 10 characters in body May15 asked NDSolve with vector function May15 comment Plotting points and functions in one graphic Look Epilog in help.