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19h
comment Generate a list of symbols for the planets
@ChipHurst Good call! Or even Through[EntityClass["Planet", All]["Glyph"]["Name"]]
20h
comment How can I stop PlotRangePadding from cutting off points in a ListPlot?
argh that should have been PlotRangeClipping->False, PlotRange->All
2d
comment List Operations: how to combine two lists (pattern given)
even shorter: MapThread[List, {a, b}, 2]
May
21
comment Binary file gymnastics
@PabloGalindoSalgado if I were to guess, I would suspect they are in fact complex doubles
May
20
comment How to speed up Colorize
and finally before this get likely gets locked: Graphics[Raster[ImageData[A, DataReversed -> True], ColorFunction -> "AvocadoColors"]]
May
20
comment How to speed up Colorize
Although it might not save speed in terms of computation time, you might find ImageFileApply to be a useful function, especially when processing a large number of images.
May
19
comment Evaluation problems with NDSolve using the fixed step ExplicitEuler-Method
try defining your b and g as follows: b[t_?NumericQ]:=pulseTrain[0,1/32,1,10][t];g[t_?NumericQ]:=32 b[t]
May
15
comment Orthogonality relations of Hermite polynomials
Which version of Mathematica are you using. Using 10.1 it takes less than a second to calculate n=m=10.
May
12
comment Curious solutions of x' = Sqrt(x), x(0)=4
DSolve[{x'[t] == Surd[x[t], 2], x[0] == 4}, x[t], t]
May
12
comment Make the map of rivers and lakes of the country
You can try CTRL+= rivers in belarus.
May
12
comment How to rotate a “completegraph” without image rescaling while rotating
....you will send chuy nonconsecutive $20 bills...
May
12
comment Want apply “Position” in my list of Entities
alternatively Through[(GeoEntities[CountryData["Belarus"],"Lake"|"Canal"])["Position"]]
May
11
comment Bug: Export sometimes adds unwanted background to PDF files
You might try specifying Background->None as an option to Export
May
11
comment A Query using Select and Quiet fails but Select by itself works
You can use either data2[Select[StringMatchQ[ToString@#a, "hey*"] &]] or the wordier data2[Select[ Length[Cases[{#a}, x_String /; StringMatchQ[x, "hey*"] ]] > 0 &]] if you feel the need to avoid ToString
May
11
comment A Query using Select and Quiet fails but Select by itself works
Isn't the issue entirely that you want StringMatchQ to work with non-Strings?
May
8
comment Why is zero times vector of reals not zero?
TensorExpand[Refine[a.b]]
May
8
comment Dataset fails on StringMatchQ warning due to Missing value
Select[StringMatchQ[ToString[#a], "hey"] &]?
May
7
comment Does Mathematica store hidden information for matrix objects?
Indeed there is something certainly amiss. See this: f = (Print[Equal[##]]; Equal[##]) &; AntihermitianMatrixQ[m, SameTest -> f] as opposed to HermitianMatrixQ[m, SameTest -> f].
May
7
comment Does Mathematica store hidden information for matrix objects?
I think a workaround might be to use an explicit SameTest. {AntihermitianMatrixQ[m, SameTest -> (Simplify[#1 - #2] == 0 &)], HermitianMatrixQ[m, SameTest -> (Simplify[#1 - #2] == 0 &)], AntihermitianMatrixQ[m, SameTest -> (Simplify[#1 - #2] == 0 &)]}
May
7
comment NDSolve with external function
Perhaps you can use Derivative[1,0,0][g][a,s0,t]