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Feb
2
comment How to apply a user-defined function to a list
I have no idea what is possible in W|A Pro, but when it takes real Mathematica syntax, then you should try to define your function as f[n_]:=351n^(-7/10)
Jan
30
comment Parallel compiled functions running on parallel sub-kernels
I'm not sure I understand. Or maybe you misunderstand what I'm doing. In the first example, I run f[data] on the main kernel exactly one time. Takes 9.1 seconds on V10.3.1. Then, I'm calling it 8 times because I have 8 subkernel and it only needs 24 seconds which tells you that one single run indeed only needed 24/8=3 seconds. We are talking about two different parallelizations here. Parallel threads and parallel sub-kernels and I combine both to squeeze the last bit out of my CPU. Ping me in Mathematica Chat if you have further questions.
Jan
28
awarded  bugs
Jan
27
awarded  Popular Question
Jan
26
comment Convert (rescale) 16 Bit png image
Have you inspected your data carefully? It seems that image histogram leaves out values > 250, because the gap of 8 does not hold for all your data. Please look at DeleteDuplicates[imageData] // Sort and after that BitShiftRight[% + 1, 3]...
Jan
24
comment Fast loading of png files
The Import/Export framework is pretty large because it needs to check for all kinds of possibilities. You can distill it down to a call of the function Image`ImportExportDump`ImageReadPNG["tmp/test.png"], but even that does only speed it up a small amount. I'm not sure you can make it really fast without writing external code that calls a fast library. Can you provide your exact system and a sample "PNG"?
Jan
24
comment How can I create a random symmetric matrix in this way?
Sorry. Saw it and thought I need to clear this up as quick as possible so that no one believes it is a good way.
Jan
24
answered How can I create a random symmetric matrix in this way?
Jan
23
revised List of Mathematica related acronyms and their real meaning
added 39 characters in body
Jan
22
awarded  Good Question
Jan
22
awarded  Good Answer
Jan
22
revised List of Mathematica related acronyms and their real meaning
added 57 characters in body
Jan
22
comment List of Mathematica related acronyms and their real meaning
@Mr.Wizard and all others: I made my answer community wiki. Please help to make this a useful post and clear up some of the vague Wolfram marketing speech.
Jan
22
revised List of Mathematica related acronyms and their real meaning
added 544 characters in body
Jan
22
awarded  Nice Answer
Jan
22
awarded  Nice Question
Jan
22
revised List of Mathematica related acronyms and their real meaning
added 1071 characters in body
Jan
22
comment List of Mathematica related acronyms and their real meaning
@Moo Let me work this in later.
Jan
22
comment List of Mathematica related acronyms and their real meaning
@MikeHoneychurch I have added the Bloomberg information.
Jan
22
revised List of Mathematica related acronyms and their real meaning
added 59 characters in body