Problem saving a file

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Shani Gal
Shani Gal 2012-9-21
I
I tried saving a file, got this error message
{Warning: Variable 'Res' cannot be saved to a MAT-file whose version is older than 7.3. To save this variable, use the -v7.3 switch. Skipping...}
( by using save function: save('a.mat','Res','-mat')
What does it mean?
Thanks,
Shani
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Roberto Herrera
Roberto Herrera 2012-10-24
Hi Shani, I am dealing with the same problem saving a large 4-D matrix (>10GB) using -v7.3. It takes ages saving due to the compression in HDF. Reading is not a problem. You can map your file as a mat object (matObj), just read the "matfile" help, it works amazingly fast. Henry

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Walter Roberson
Walter Roberson 2012-9-21
It means that the variable is either more than 2 gigabytes, or contains a type of object that is not supported in older .mat files.
You should switch to
save('a.mat', 'Res', '-mat', '-v7.3');
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Walter Roberson
Walter Roberson 2012-9-21
In some cases, fwrite() and then fread() can be faster.
Shani Gal
Shani Gal 2012-9-21
Hi again,
My problem is that I have a lot of large files. Each file has a matrix with 4 columns and unknown number of rows. I need to search the 4th column of this matrix for a specific value and to retrieve the entire row the search finds.
I do the following:
a=load(a1.mat);
J=a(:,4)==Value
Out=a(J,:)
And it takes a lot of time to go over all the files. Have any idea how to speed it up?
Shani

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