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Subject:

Strange (for me) 'out of memory' problem

From:

Jorge Jovicich <[log in to unmask]>

Reply-To:

Jorge Jovicich <[log in to unmask]>

Date:

Wed, 02 Aug 2000 10:39:00 -0700 (PDT)

Content-Type:

TEXT/PLAIN

Parts/Attachments:

Parts/Attachments

TEXT/PLAIN (87 lines)

Dear SPM Gurus,

I am stuck with an 'Out of memory' problem while estimating the parameters
of a fMRI data set. 

The puzzling thing for me is that in the past I have succesfully estimated
the parameters of design matrices of this very same size (3360x3360) and
even larger. So something is different now and I can't figure out what. Perhaps
somebody can give a tip. I have appended below the error message I get on 
screen. Maybe in that message there is a hint to my problem.

Thanks a lot in advance,
Jorge

PS:
I am working on a DEC alpha workstation with 1GByte swap space. The maxMem
variable in spm_spm.m is set to 2^25 . I have also tried using 2^23 and
2^29 but it didn't help. In the past 2^25 was fine for this and larger matrix sizes.
While running the estimation I am not using the workstation for other things. It
is quite frustrating to find, after approximately one hour of processing,
that the estimation crashed just before getting to the end.

Message on screen:
*******************

SPM99b: spm_spm (v2.28)                            18:49:53 - 01/08/2000
========================================================================
Initialising design space : ...F-contrastsize of MV is:

ans =

        3360        3360

  Name           Size         Bytes  Class

  MV          3360x3360    90316800  double array
  V           3360x3360     4856164  sparse array
  action         1x4              8  char array
  ans            1x2             16  double array
  rk             1x1              8  double array
  sX             1x1        6123904  struct array
  varargin       1x3        7867092  cell array

Grand total is 13238362 elements using 109163992 bytes
  Name         Size         Bytes  Class

  MV        3360x3360    90316800  double array
  action       1x4              8  char array
  ans          1x2             16  double array
  rk           1x1              8  double array

Grand total is 11289607 elements using 90316832 bytes

                       ...done
Output images                  : ...initialised
Plane  46/46 , plank   3/3     : ...done
Design parameters              : ...V, & traces??? Error while evaluating
uicontrol Callback.


>> ??? Error using ==> .*
Out of memory. Type HELP MEMORY for your options.

Error in ==> /usr/local/spm99/spm_SpUtil.m
On line 470  ==>  trRVRV = sum(sum(V.*V)) - 2*sum(sum(V.*MV)) +
sum(sum(MV'.*MV));

Error in ==> /usr/local/spm99/spm_spm.m
On line 897  ==> [xX.trRV,xX.trRVRV] ...  %-Variance expectations


-------------------------------------------------------------------
Jorge Jovicich, Dr. rer. nat.

Dept. of Neurology  	    |  Computation and Neural Systems
Harbor-UCLA Medical Center  |  California Institute of Technology
1124 W Carson St. B-4       |  1200 E California Blv., BI 139-74         
Torrance, CA 90502, USA	    |  Pasadena, CA 91125, USA
310-222-5656/7              |  626-395-2882  
310-222-5658 (fax)	    |  626-796-8876 (fax)   
[log in to unmask]	    |  [log in to unmask]
       



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