Gregory Rut
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 Jan 31 awarded Yearling Jan 22 comment $\tt DiracDelta$ behaves incorrectly on multidimensional integral Seems to work fine in my case. Have you tried restarting the kernel? Maybe there's a definition of F that's altering the result. Jan 12 comment Black lines at the border of graphics @YvesKlett, will do that. It happens on two of my machines. I thought it might be a more common problem. Jan 12 comment Black lines at the border of graphics An exported. But I get these lines on the screen as well. Jan 12 comment Black lines at the border of graphics Yeah, it's weird. I'm getting these lines on two different machines (both with w7 64). Jan 12 revised Black lines at the border of graphics Specified the operation system. Jan 12 asked Black lines at the border of graphics Jun 6 comment DSolve returns a “wrong” solution Haha, right:-). Jun 6 comment DSolve returns a “wrong” solution What does this equation represent? Jun 6 comment Improve speed in module with NIntegrate and FindRoots I can help: use Print to mark different points in your code. Jun 5 comment How to make a twice-differentiable function that approximates some data? What about splines? They should work pretty well. Jun 5 comment Traces of the level surface $z=4x^2+y^2$ How about changing ContourStyle -> {Opacity[0.3]} to ContourStyle -> {Opacity[0.0], Opacity[0.3], Opacity[0.3], Opacity[0.3], Opacity[0.3]} ? May 25 comment Solve wave equation using DSolve? Bichoy, kattern, thanks. Seems I was a little bit ignorant. May 23 revised Recurrence equation Corrected spelling, corrected formating. May 23 suggested approved edit on Recurrence equation May 23 revised Using NDSolve within Manipulate Added some description. May 23 comment Solve wave equation using DSolve? Here's an awkward question: shouldn't the wave equation have a second order derivative of x insted of the fourth? Have you seen this one mathworld.wolfram.com/WaveEquation1-Dimensional.html May 23 comment Using NDSolve within Manipulate Glad it works:-). May 23 comment Using NDSolve within Manipulate This would require adding addition variables con1, con2,... in the revised1 function just as I've defined the dependence on k1 and others. May 23 comment Using NDSolve within Manipulate I've seen the changes of the plot and they are very small. Perhaps one could change the initial conditions for a "better" result (less static one).