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Jul
31
comment Mma 10: Half the parallel power (Macs)?
@Szabolcs As I wrote below (comment to the proposed answer) even if you set manually the number of kernels to 4 the performance is not as good as it was with Mathematica 9. I think this is very funny and, as suggested, I contacted Wolfram support.
Jul
31
comment Mma 10: Half the parallel power (Macs)?
One more bit of information: if in Mathematica 10 I manually set the number of local kernels to 4 it takes 83.5s: 20% slower than in Mathematica 9... quite funny and roughly agrees with what wolfs has seen.
Jul
31
comment Mma 10: Half the parallel power (Macs)?
@Szabolcs I don't agree that this change is beneficial. I have been using all the available virtual cores with very good efficiency, it is just a matter of reducing the overhead. As a concrete example, to run my turboGL code (www.turbogl.org - set the parameter nst to nst=10^6) on my MacBook Air with Intel i7 it takes 69s with Mathematica 9 and 123s with Mathematica 10 (default configuration).
Jul
31
comment Mma 10: Half the parallel power (Macs)?
I have the same issue on my MacBook Air: by default Mathematica 10 uses 2 instead of the 4 cores that Mathematica 9 would use.
Jul
10
awarded  Popular Question
Jul
10
asked Bug in NDSolve (Mathematica 9.0.1)?
Jul
10
accepted Funny behavior of Ellipsoid function
Jul
2
awarded  Curious
Jun
26
comment Funny behavior of Ellipsoid function
Did you find this syntax in the documentation? Where? Also, how do you generalize this syntax to three dimensions?
Jun
26
comment Funny behavior of Ellipsoid function
thanks, but i need to use vectors as directions (which may not be aligned with the axes)
Jun
26
asked Funny behavior of Ellipsoid function
Mar
29
awarded  Yearling
Dec
14
comment Import selected columns from a tab delimited text file
@image_doctor How can I use this solution if 'my file.txt' is given as ToFileName[...]? Also, how is the command for reading the first four columns only?
Sep
13
comment Function to marginalize a table over given parameters
It's working alright, thanks!
Sep
12
comment Function to marginalize a table over given parameters
thanks! only one thing: the parameters pp have to be sorted. Or, would it be possible to modify your function such that if i give pp={3,2}, then i get a table which has the third parameter in the first dimension and the second parameter in the second dimension? Otherwise i can do this later using: newtab = newtab[[All, All, {2, 1, 3}]]; newtab = Transpose[newtab, {2, 1}]
Sep
12
awarded  Benefactor
Sep
12
accepted Function to marginalize a table over given parameters
Sep
10
awarded  Promoter
Jul
18
comment Function to marginalize a table over given parameters
@bill s I added some explanations, is it now clear?
Jul
10
revised Function to marginalize a table over given parameters
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