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Topic: parfor: keep outputs with same output filename
Replies: 12   Last Post: Aug 1, 2013 2:35 AM

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Mike

Posts: 336
Registered: 4/17/07
Re: parfor: keep outputs with same output filename
Posted: Jul 23, 2012 5:45 AM
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Hi, dpb

thank you for your info.
To be more clear, I simply my question with follows:
1) I create a fortran file with following:

program main
integer:: i
open(10,file='inputpar.dat',status='old')
read(10,*) i
write(30,*) i
write(*,*) 'fortran main :', i
end

I compile it within the project and have Console2.exe in 'D:\temp\Console2\Console2\Debug'.

2) in matlab, I have following:
fid2=fopen('test.dat','a'); % this file should be run parallel'
matlabpool open local 3
parfor i=1:100
fid1=fopen('inputpar.dat','w'); % be read by Console2.exe
fprintf(fid1,'%2d\n',i);
fclose(fid1);
dos('Console2.exe<inputpar.dat');
out=importdata('fort.30')
fprintf(fid2,'%2d\n',out);
end
matlabpool close
s=load('test.dat')

Then I run this cell (step 2), I have the results:
Starting matlabpool using the 'local' configuration ... connected to 3 labs.
fortran main : 64
fortran main : 64
fortran main : 64
??? Error using ==> parallel_function at 598
Error in ==> parallel_function>make_general_channel/channel_general at 894
Invalid file identifier. Use fopen to generate a valid file identifier.

I've checked the content in inputpar.dat is 64.
I've also checked the content in fort.30 is also 64.
I also check
>> out=importdata('fort.30')

out =

64

I don't understand the error message shown above.
May you explain for me?

Thank you in advance.

Mike
On Sunday, July 22, 2012 2:20:58 AM UTC+8, dpb wrote:
> On 7/20/2012 10:56 PM, Mike wrote:
> &gt; Hi,
> &gt;
> &gt; If I run an exection file which output the same filename for many
> &gt; times using parfor, the output files will be overwritten. At last, I
> &gt; have only one output file. How to keep the output file in every run?
> ...
>
> I presume you&#39;re looking for the &#39;append&#39; option for fopen???
>
> doc fopen
>
> --





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