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Re: Avoiding loop in stats [message #52147]

Sun, 21 January 2007 08:01

Foldy Lajos
Messages: 268
Registered: October 2001

Senior Member

On Sun, 21 Jan 2007, yp wrote:

> On Jan 19, 8:26 pm, FÖLDY Lajos <f...@rmki.kfki.hu> wrote:
>> Some speedup can be achieved with optimized memory access (if you have
>> enough memory for two copies of data):
>>
>> temp=transpose(data, [2,0,1])
>> for j=0l,2000l-1 do for i=0l,4000l-1 do data_st[i,j]=st_func(temp[*,i,j])
>>
>> regards,
>> lajos- Hide quoted text -- Show quoted text -
>
> Thanks Lajos,
> It does improve the speed by >35%. Quite useful :)
> btw is it necessary to copy data into temp var? I did not see any
> difference when I overwrote data with transposed data.
> --yas
>

I didn't want to destroy your original data structure. You can use data
instead of temp if you like (but transpose will still use extra memory).

regards,
lajos

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		Re: Avoiding loop in stats By: Foldy Lajos on Sun, 21 January 2007 08:01
		Re: Avoiding loop in stats By: yp on Sun, 21 January 2007 05:11

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