Re: Memory allocation error

[Sergei Steshenko]

>________________________________
> From: asha g <address@hidden>
>To: Sergei Steshenko <address@hidden> 
>Cc: "address@hidden" <address@hidden> 
>Sent: Tuesday, December 4, 2012 10:14 AM
>Subject: Re: Memory allocation error 
> 
>
>
>
>> 
>>
>>I keep getting this error message when I try to run certain programs. Is 
>>there some way I can increase the memory so this error does not happen. 
>>Thanks Asha G
>>
>>error: memory exhausted or requested size too large for range of Octave's 
>>index type -- trying to return to prompt
>>error: popen2: process creation failed -- Cannot allocate memory
>>error: called from:
>>error:   /usr/share/octave/3.2.3/m/plot/__gnuplot_open_stream__.m at line 28, 
>>column 44
>>error:   /usr/share/octave/3.2.3/m/plot/gnuplot_drawnow.m at line 85, column 
>>19
>>octave3.2:1> 
>>
>>>
>
>You don't
show your code.
>
>I assume the problem occurs when you call some *plot function. If it's the 
>case I suggest to check sizes of the function arguments.
>
>Your problem begins with
>
>"
>memory exhausted or requested size too large for range of Octave's index type 
>-- trying to return to prompt
>",
>
>i.e. you have to find out why "memory [is] exhausted". 
>
>Regards,
>  Sergei.
>
>
>
>
>
> 
> I am attaching the script files. There are many function files. Not sure 
>whether I shd send them or this will do.
>Thanks
>Asha G 
>


I, of course, cant't tell just looking at files what's wrong.

How much memory does this:

vvvv=zeros(niter,N); abmm = zeros(niter,N); abnn = zeros(niter,N); abhh = 
zeros(niter,N); V= zeros(1,N);alphan = zeros(1,N);

need ?


Anyway, you need to perform basic debugging.

I dislike debuggers in general; in order to find which exactly line chokes the 
script I do the following:
1) I introduce a diagnostic print statement:

fprintf(stderr, "CHECKPOINT 1\n");

2) I copy-paste the statement into several places of the top level script, 
_not_ forgetting to increment '1' above in each copy-paste;

3) I run the top level script and see what's the last CHECKPOINT number printed.


So, if the last one is 'CHECKPOINT 3', the problem occurs obviously between 
'CHECKPOINT 3' and 'CHECKPOINT 4'.

In such a manner I pretty quickly narrow down the area to just one line, and 
then investigate what's wrong with that line.

Regards,
  Sergei.