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 Oct 8 awarded Popular Question Mar 2 awarded Nice Question Mar 2 awarded Yearling Nov 3 awarded Notable Question May 19 awarded Popular Question Apr 22 awarded Popular Question Aug 12 awarded Popular Question Aug 11 awarded Yearling Apr 5 comment How to approximate a given WAV file with trigonometric series? Thanks! Is it possible to export this as a WAV file? I did try Export["file.wav",...], whith various things as ... (i.e., Sound[...], SampledSoundList[...], ...), but didn't succeed. Mar 26 asked How to approximate a given WAV file with trigonometric series? Sep 29 comment How to speed up drawing a tangent plane? OK, thanks. For the moment I thought that somehow the Limit one is chosen if the D doesn't work (e.g., when the function is given by a separate rule for one point). And thanks for the nicety - the large point! (I did it using a one-element list in ListPointPlot3D, definitely less elegant.) Sep 29 comment How to speed up drawing a tangent plane? Thanks! I just discovered With myself, too, but I've put it inside Show; I guess this doesn't make much difference. Sep 29 comment How to speed up drawing a tangent plane? Interesting. Why do you provide two rules for fx[x_,y_]? Sep 29 comment Are there any offline tutorials for Mathematica? Well... 70 EUR - waaay above my price range. I'd pay, say up to 10 USD; this price looks more like a joke for me. Of course, with 1200+pages it might be fair, but I guess 80% of those pages would be of no use to me. Anyway, thanks. Sep 29 asked How to speed up drawing a tangent plane? Sep 29 accepted Are there any offline tutorials for Mathematica? Sep 29 accepted How to find (numerical) value of a derivative at point? Sep 29 comment How to find (numerical) value of a derivative at point? Exactly, I just thought there's another way. Sep 29 comment Are there any offline tutorials for Mathematica? Nope, thanks! BTW: thank you for your book on Mma programming, I already have it on my Kindle and have read quite a bit! (And could you make this an answer, so that I can accept it?) Sep 29 comment How to find (numerical) value of a derivative at point? Thanks, but formally, this is the limit of the derivative as the point tends to zero, not exactly the derivative at zero (though in this case they are equal). Do I have to resort to Limit and the definition of a derivative to do it in the general case?