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 Aug27 comment Operator and VariationalMethods You should use an expression for first argument of VariationalD not a function. So just replace g with last expression %. Apr12 comment Creating centered inline cell in text cell Maybe there is, I just tried to do this and didn't find anything. Apr12 comment Creating centered inline cell in text cell Are you sure it was created in the front end? Maybe it was imported from TeX, MathML or something. Or it was modified manually, adding GridBoxItemSize option there. Apr11 comment Symbolic scalar-by-matrix derivative Until there is no actual tensor inside Tr it's just a symbolic expression, is up to you how to interpret it. Apr11 comment Symbolic scalar-by-matrix derivative @cryo111 Wouldn't a matrix derivative of a matrix be a fourth rank tensor? Therefore its trace should be a matrix, not a scalar. Apr5 comment Fit two intersecting straight lines in Mathematica I would estimate an error from the distance between closest to k data points . Feb13 comment Defining my own invisible operator @Öskå Yes, basically I need an invisible infix operator of my choice. Jan4 comment Different integral when used with assumptions I would say it's a bug that there is not every conditional in the first result. But the results are the same if you assume this condition. Oct17 comment Too much whitespace in a GraphicsGrid containing Legended Plots Adjust AspectRatio parameter inside your Plot function. For example AspectRatio -> 1. Maybe move your legend down. Sep21 comment Extracting variables from Hold expression It works perfectly! Thank you! Jun8 comment How do I extract the middle element(s) of a given list? @Mr.Wizard I already anticipate the answer with time comparisons of all solutions to be made ;) May27 comment Row Alignment in Grid Quick fix would be changing spacing for second column to 1.75. May26 comment How to define a pure function with a Module? Classic mistake fpiecewise[x_?NumberQ, ... May25 comment rule-based implementation of an algorithm Probably you need ReplacePart and FixedPoint. May10 comment How can I create a 3D FilledCurve object? @Silvia I don't have any errors. May10 comment How can I make a Plot over a discrete set of domain points? No problem. You can start from here and here. May10 comment How can I make a Plot over a discrete set of domain points? ListPlot. To connect the dots: Joined->True or ListLinePlot. May8 comment How to compare power towers in Mathematica? I hate that expressions like 4^4^3^3^3 totally freeze my computer instead of just telling me to stop trying evaluating this and quietly abort :(. May8 comment How to compare power towers in Mathematica? That's pretty impressive! I would like to see an example when this will fail, if it exists of course :). May5 comment Error invoking Information on functions containing Legended @Silvia The problem appears again if I evaluate plot somewhere else. And then even f[x_]:=Legended[1,x] produces this error.