MATLAB Central Newsreader - Standard Deviation Calculation: Out of Memory?

Standard Deviation Calculation: Out of Memory?

Stephen — Thu, 26 Jul 2007 15:11:19 -0400

Hi,

I was trying to calculate the standard deviation of a 3,000,000 by 9 matrix using function "std". But I got an "Out of Memory" error message. Is it because Matlab couldn't handle stdev calculation if the underlying data is too big?

Thanks,
Stephen

Re: Standard Deviation Calculation: Out of Memory?

Titus — Thu, 26 Jul 2007 17:54:11 -0400

Hi Stephen,

your matrix needs about 200MB of memory. The function std creates one copy
of this matrix during the computation, so that's another 200MB, which seem
not to be there anymore, therefore the error message...

Titus

"stephen " <huangj5@nationwide.com> schrieb im Newsbeitrag
news:f8adin$e8n$1@fred.mathworks.com...
> Hi,
>
> I was trying to calculate the standard deviation of a 3,000,000 by 9
> matrix using function "std". But I got an "Out of Memory" error message.
> Is it because Matlab couldn't handle stdev calculation if the underlying
> data is too big?
>
> Thanks,
> Stephen

Re: Standard Deviation Calculation: Out of Memory?

Rick Rosson — Thu, 26 Jul 2007 15:06:39 -0400

See MathWorks Technical Note 1106:

http://www.mathworks.com/support/tech-notes/1100/1106.html

"stephen " <huangj5@nationwide.com> wrote in message
news:f8adin$e8n$1@fred.mathworks.com...
> Hi,
>
> I was trying to calculate the standard deviation of a 3,000,000 by 9
> matrix using function "std". But I got an "Out of Memory" error message.
> Is it because Matlab couldn't handle stdev calculation if the underlying
> data is too big?
>
> Thanks,
> Stephen