# Tag Info

4

A fix is to give SystemPrivateDerivativeX the NHoldAll attribute (which it probably should have, since it seems to be used as a dummy indexed variable): SetAttributes[SystemPrivateDerivativeX, NHoldAll] f[x_] = BesselI[0, 1.0 x]; f'[x] (* 1. BesselI[1, 1. x] *)

0

Wolfram let me know that this is not supported in the Wolfram cloud!

2

Not certain what is going on but you can work around with Interpolation. ifoo = Interpolation[ha, InterpolationOrder -> 1]; Show[ ListPointPlot3D[ha, PlotRange -> All, AxesLabel -> {"x", "y", "z"}, ImageSize -> Large], Plot3D[ifoo[x, y], Evaluate[Sequence @@ MapThread[Prepend, {ifoo["Domain"], {x, y}}]], PlotStyle -> Opacity[...

1

There is a simple workaround: ClearAll[a, x]; f = (4 x^2)/((-a^2 - 4 x^2 + a Sqrt[a^2 + 4 x^2]) (a^2 + 4 x^2 + a Sqrt[a^2 + 4 x^2])); Series[f, {x, 0, 1}, Assumptions -> Re[a] > 0] *-(1/a^2)+O[x]^2 * Series[f, {x, 0, 1}, Assumptions -> Re[a] < 0] *-(1/a^2)+O[x]^2 * The case $\Re a=0$ makes a trouble.

4

This is a major bug in version 12.0.0. Frankly, I am puzzled by why they didn't release a 12.0.1 to fix this ... for me it is a recurring major inconvenience. The file in which the settings are stored can be found in this directory: SystemOpen@FileNameJoin@{$UserBaseDirectory, "FrontEnd"} Close Mathematica before editing it. First try init.m. If it ... 2 That changed for the better in version 12.0. E.g. f[z_, n_] := 2^(n - 1)/Sqrt[z] (PolyLog[n, Sqrt[z]] - PolyLog[n, -Sqrt[z]]); FullSimplify[Series[HurwitzLerchPhi[1-Sqrt[z],3,1/2]-f[1-Sqrt[z],3],{z,0, 8}],0<z<1]$ O\left(z^{17/2}\right)\$

Top 50 recent answers are included