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 Aug 23 awarded Necromancer Aug 18 awarded Nice Answer Aug 18 awarded Necromancer Aug 18 awarded Nice Answer Aug 16 awarded Popular Question Jul 3 awarded Nice Question Jun 23 comment Excel column label from integer To clarify: if, say, the function is named spreadsheetColumn[], then spreadsheetColumn[27] should return "AA"? Jun 23 comment How to choose three points on the circle so that the triangle is not a right triangle? Maybe include Circle[{-2, -1}, 5] too, to facilitate visualization. Jun 23 comment Solving this system of equations produces an error message about badly conditioned matrix You'll want to look at Eigensystem[]. Jun 23 comment Measuring the area of non analytical regions in a plot I don't see you mentioning your "different reasons"; if you have the points comprising your curves, you can at the very least use the "shoelace formula" or fancier methods to get a good estimate of the area. Jun 23 revised How to choose three points on the circle so that the triangle is not a right triangle? edited tags Jun 23 revised Malliavin Derivative with Mathematica is it possible? edited tags Jun 23 comment Numerical Integration with InverseErfc This is an answer, but apparently not for this question. Jun 23 revised Numerical Integration with InverseErfc edited tags Jun 22 revised I can't understand FindShortest Tour edited tags; edited tags Jun 22 comment Trace of FullSimplify "if it is possible for Mathematica to show the steps" - not in this case, I believe. Jun 22 comment Trace of FullSimplify In general, the simplification methods internally used by Mathematica do not necessarily correspond to how one might simplify by hand; remember that a method that is simple for computers to do is not necessarily simple for humans, and vice-versa. Jun 22 comment How to maximize a function over a rotation matrix? I don't have Mathematica on me at the moment, but you might try {Array[K, {3, 3}], {p, q, r}, a, b} /. Last[NMinimize[Flatten[{Total[MapThread[SquaredEuclideanDistance, {f[#, Array[K, {3, 3}], {p, q, r}, a, b] & /@ x, y}]], Thread /@ Thread[Transpose[Array[K, {3, 3}]].Array[K, {3, 3}] == IdentityMatrix[3]], Det[Array[K, {3, 3}]] == 1, a > 0, b > 0}], Flatten[{Array[K, {3, 3}], {p, q, r}, a, b}]]]... Jun 22 comment How to maximize a function over a rotation matrix? ...and some example points would be, y'know, cool too... Jun 22 comment How to maximize a function over a rotation matrix? Some more definiteness would be appreciated; in particular, what would your $f$ typically look like?