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Jan
17
revised One less arrow vector than asked for
added 37 characters in body; edited tags
Jan
17
comment One less arrow vector than asked for
Desired result in v8.0.4 and v9.0.1. I think it's reasonable to consider it as a bug.
Jan
17
revised Least effort to handle a point source inside the domain of PDE(s)
edited tags
Jan
17
comment Least effort to handle a point source inside the domain of PDE(s)
@Jens Yeah, that sounds reasonable. Maybe you can consider giving an answer?
Jan
17
revised Modelling the effect of a structure on a “tsunami” (hyperbolic wave equation)
deleted 252 characters in body
Jan
16
revised Least effort to handle a point source inside the domain of PDE(s)
a FDM example added. Notice this isn't the fastest implementation, but it's relatively simple.
Jan
16
asked Least effort to handle a point source inside the domain of PDE(s)
Jan
16
reviewed Approve Excessive memory use by Mathematica kernel in 10.0.2 after executing simple commands
Jan
16
comment The default ColorFunction of DensityPlot before v10?
@BrettChampion Oh……I see. You can make this into an answer, anyway it's not that obvious, I think.
Jan
16
asked The default ColorFunction of DensityPlot before v10?
Jan
13
awarded  Announcer
Jan
10
reviewed Edit Decimal-to-ASCII conversion
Jan
10
revised Workarounds for a possible bug in the linearity of FourierTransform
improve the rule a little
Jan
10
comment Why is my data 10 times slower than random data when doing matrix multiplication
@xslittlegrass 15.954589770191005 == MachinePrecision does return True, but when using as precision, they're different, the latter represents machine precision, while the former represents arbitrary precision, they lead to 2 different algorithm… well, it's a little hard for me to explain in my own words, but there're many related posts in this site, for example this one.
Jan
9
comment Workarounds for a possible bug in the linearity of FourierTransform
Seems this hasn't been done yet. Hello, welcome to Mathematica.SE! I suggest the following: 1) As you receive help, try to give it too, by answering questions in your area of expertise. 2) Read the faq! 3) When you see good questions and answers, vote them up by clicking the gray triangles, because the credibility of the system is based on the reputation gained by users sharing their knowledge. Also, please remember to accept the answer, if any, that solves your problem, by clicking the checkmark sign!
Jan
9
comment Computation time depends on the matrix elements!
A better check is {Or @@ PackedArrayQ /@ matrix, And @@ PackedArrayQ /@ matrix2} :)
Jan
9
comment Can I force Mathematica to use machine precision?
The only thing I can think of at the moment is Compile, is it of interest?
Jan
9
comment Inverse Fourier Transform - wolfram alpha vs Mathematica 9.0
It's simply because the InverseFourierTransform of your expression doesn't exist. Try InverseFourierTransform[Exp[ -b v^2], v, w, Assumptions -> #] & /@ {b > 0, b < 0}
Jan
9
comment Possible bug with FourierTransform linearity
Just wrote a "shell" for FourierTransform here, which (I think) is a little more stable than the Distribute approach.
Jan
9
answered Workarounds for a possible bug in the linearity of FourierTransform