MATLAB Central Newsreader - overcoming the limit of repmat

overcoming the limit of repmat

Sourav Roy — Wed, 07 May 2008 03:43:03 -0400

Hi,
I tried the below code :-
>> z = rand(1,(666),10000);
>> x = repmat(z,300,1);

The code gave the below error:-

??? Maximum variable size allowed by the program is
exceeded.

Error in ==> repmat at 97
B = A(subs{:});

While this one worked,

>> ab = z(:,:,1);
>> z = rand(1,(666),100);
>> x = repmat(z,300,1);

Kindly suggest how I can overcome this.

Re: overcoming the limit of repmat

helper — Wed, 07 May 2008 04:03:02 -0400

"Sourav Roy" <souravroy1@rediffmail.com> wrote in message
<fvr8g7$sep$1@fred.mathworks.com>...
> Hi,
> I tried the below code :-
> >> z = rand(1,(666),10000);
> >> x = repmat(z,300,1);
>
> The code gave the below error:-
>
> ??? Maximum variable size allowed by the program is
> exceeded.
>
> Error in ==> repmat at 97
> B = A(subs{:});
>
> While this one worked,
>
> >> ab = z(:,:,1);
> >> z = rand(1,(666),100);
> >> x = repmat(z,300,1);
>
> Kindly suggest how I can overcome this.

You are trying to create a 300-by-666-by-10000 matrix of
double precision (8 byte) values. This requires
300*666*10000*8/1024^3 = 14.88 GB of memory. It ain't
gonna happen with 32-bit MATLAB. Check out the following
technical note:

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

Get 64-bit MATLAB and a 64-bit machine.

By the way... love the tags "matlab" and "code".

Re: overcoming the limit of repmat

Sourav Roy — Wed, 07 May 2008 04:43:03 -0400

"helper " <spamless@nospam.com> wrote in message
<fvr9lm$nkk$1@fred.mathworks.com>...
> "Sourav Roy" <souravroy1@rediffmail.com> wrote in message
> <fvr8g7$sep$1@fred.mathworks.com>...
> > Hi,
> > I tried the below code :-
> > >> z = rand(1,(666),10000);
> > >> x = repmat(z,300,1);
> >
> > The code gave the below error:-
> >
> > ??? Maximum variable size allowed by the program is
> > exceeded.
> >
> > Error in ==> repmat at 97
> > B = A(subs{:});
> >
> > While this one worked,
> >
> > >> ab = z(:,:,1);
> > >> z = rand(1,(666),100);
> > >> x = repmat(z,300,1);
> >
> > Kindly suggest how I can overcome this.
>
> You are trying to create a 300-by-666-by-10000 matrix of
> double precision (8 byte) values. This requires
> 300*666*10000*8/1024^3 = 14.88 GB of memory. It ain't
> gonna happen with 32-bit MATLAB. Check out the following
> technical note:
>
> http://www.mathworks.com/support/tech-notes/1100/1106.html
>
> Get 64-bit MATLAB and a 64-bit machine.
>
> By the way... love the tags "matlab" and "code".
>
>
Thakns Helper,
I have realised that, just exporing how to go about doing
this .

Re: overcoming the limit of repmat

Loren Shure — Wed, 07 May 2008 12:06:00 -0400

In article <fvr9lm$nkk$1@fred.mathworks.com>, spamless@nospam.com
says...
> "Sourav Roy" <souravroy1@rediffmail.com> wrote in message
> <fvr8g7$sep$1@fred.mathworks.com>...
> > Hi,
> > I tried the below code :-
> > >> z = rand(1,(666),10000);
> > >> x = repmat(z,300,1);
> >
> > The code gave the below error:-
> >
> > ??? Maximum variable size allowed by the program is
> > exceeded.
> >
> > Error in ==> repmat at 97
> > B = A(subs{:});
> >
> > While this one worked,
> >
> > >> ab = z(:,:,1);
> > >> z = rand(1,(666),100);
> > >> x = repmat(z,300,1);
> >
> > Kindly suggest how I can overcome this.
>
> You are trying to create a 300-by-666-by-10000 matrix of
> double precision (8 byte) values. This requires
> 300*666*10000*8/1024^3 = 14.88 GB of memory. It ain't
> gonna happen with 32-bit MATLAB. Check out the following
> technical note:
>
> http://www.mathworks.com/support/tech-notes/1100/1106.html
>
> Get 64-bit MATLAB and a 64-bit machine.
>
> By the way... love the tags "matlab" and "code".
>
>
>

Depending on what you are ultimately trying to achieve, you might be
able to circumvent repmat and still get useful results using bsxfun.
--
Loren
http://blogs.mathworks.com/loren/