New answers tagged bugs
4
A fix is to give System`Private`DerivativeX the NHoldAll attribute (which it probably should have, since it seems to be used as a dummy indexed variable):
SetAttributes[System`Private`DerivativeX, 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)$
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