# Search Results

Results tagged with Search options answers only user 50
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Questions on exact, symmetric reversal of a definition or functional mapping (i.e. the original form is returned when applied twice). Use this tag for issues on inversion of Mathematica expressions, or general inversion of math constructs.

Split the tangent: ArcTan[c Cos[γ], Sin[γ]] A quick Manipulate[] for fun: Manipulate[Graphics[{{Opacity[1/2, ColorData[97, 1]], Disk[{0, 0}, 1, {0, γ}]}, {Opacity[1/2, ColorDa …
answered Aug 5 '16 by J. M. will be back soon
Here's a short routine for computing the Mach number from the Prandtl-Meyer equation: prandtlMeyerMachNumber[γ_?InexactNumberQ, ν_?InexactNumberQ] := Module[{prec = Precision[{γ, ν}], β, η, λ, m …
answered May 11 '13 by J. M. will be back soon
Henrik has already written on the undocumented second argument of a LinearSolveFunction[], so let me just put out a short demo wrapper showing how to use the built-in, but undocumented LAPACK routines …
answered Mar 21 '18 by J. M. will be back soon
Let me demonstrate two approaches in this answer. P.J. Acklam (WayBack archive of his page) devised a not-too-long method to approximate the quantile of the Gaussian distribution, with absolute error …
answered Sep 24 '18 by J. M. will be back soon
Here's a nice one-liner: TransformationFunction[{{1, 0, 0, 0}, {0, 0, -1, 0}, {0, 1, 0, 3}, {0, 0, 0, 1}}] // InverseFunction TransformationFunction[{{1, 0, 0, 0}, {0, 0, 1, -3}, {0, -1, 0, 0}, {0 …
answered Feb 13 '16 by J. M. will be back soon