Casting MapResult

[jmh530 via Digitalmars-d-learn]

On Tuesday, 16 June 2015 at 16:38:55 UTC, John Colvin wrote:
>
> What OS are you on? See http://wiki.dlang.org/Compilers

I'm on Windows 7 at work, and I have both Win7 and linux at home. 
I figure I can try it on linux at home. Sometimes the work 
computer is a bit funky with installing things, so I didn't want 
to bother.

On Tuesday, 16 June 2015 at 16:37:35 UTC, John Colvin wrote:
>
> If you want really fast exponentiation of an array though, you 
> want to use SIMD. Something like http://www.yeppp.info would be 
> easy to use from D.

I wasn't familiar with yeppp. Thanks. I'll probably keep things 
in as native D for now, but it's good to know there are other 
options.

I compared the results with Julia and R while I was at it. The D 
code was quite a bit faster than them. It's just that numpy's 
doing something that is getting better performance. After some 
investigation, it's possible that my version of numpy is using 
SSE, which is a form of SIMD from Intel. It doesn't seem to be 
easy to check this. The one method I found on stackoverflow 
doesn't work for me...

It looks like D has some support for simd, but only for a limited 
subset of matrices.