in reply to Re^6: Write Matlab binary MAT-files from Perl (repeat)
in thread Write Matlab binary MAT-files from Perl

Hi tye,
I'm sorry, but it didn't work...

Just to make sure I understood correctly:
I changed the print line from this:
print ($h pack ('l5Z*d*', $type, $m, $n, $imag, $len, $name, @a));
to this:
print ($h pack ('l5Z*'.('Z*'x@s), $type, $m, $n, $imag, $len, $name, @a));

and from the main routine called:
mat4_write ('foo', 3, 1, ('aaa','bbb','ccc'), *MAT);

If you have another idea I would love to try it.
If not, I will give it up and save string arrays as their ascii numbers representations and convert back to strings inside matlab...

Thanks and good night,
Koby

p.s: Does Perl has a built-in function that converts a string to an array of its ascii numbers representation?
i.e.: 'ABC' -> (65,66,67)

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Re^8: Write Matlab binary MAT-files from Perl (repeat)
by Anonymous Monk on Jul 26, 2014 at 00:36 UTC

    What's your perl version? Try this perhaps: 

    print $h pack 'l4 l/Z (Z*)*', $type, $m, $n, $imag,  $name,  @a;

    [download]
    Re: ascii string to characters—that's simple: my @arr = unpack 'C*', $x;

[reply]
[d/l]
[select]
      Re: ascii string to characters—that's simple: my @arr = unpack 'C*', $x;

      Not if its packed with 'Z*'.

      Plus: Your '(Z*)*' is no substitute for 'd*'. Remember the OP said that d* worked for arrays of less than 10 values.

      Tye called it above with binmode; your addition is unnecessary and wrong.

      With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
      Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
      "Science is about questioning the status quo. Questioning authority".
      In the absence of evidence, opinion is indistinguishable from prejudice.
[reply]

        Thank you both very much for your comments!

        Tye,
        my Perl version is:
        perl 5, version 12, subversion 2 (v5.12.2) built for MSWin32-x64-multi-thread

        The second format you gave me didn't work either...
        It creates a file matlab refuses to load.
        Here is the comparison between this file and the expected one (created by matlab for reference):
        http://srv1.jpg.co.il/10/53d36c18b62cc.jpg

        BrowserUK,
        My strings are "simple" ones (not packed with 'Z*') and the command Tye wrote worked in converting the string to array of ascii numbers.

        Re: Tye called it above with binmode; your addition is unnecessary and wrong.

        I don't understand what you mean... How should I change the format to save the strings in the format matlab needs them...?

        Thanks,
        Koby

[reply]
[d/l]
Re^8: Write Matlab binary MAT-files from Perl (repeat)
by Anonymous Monk on Jul 25, 2014 at 23:44 UTC

    Forgot to mention that the created file was loaded correctly to Matlab, but the matrix has 3 zeros instead of the 3 desired strings.

    Thanks,
    Koby

[reply]

      In case this helps, here's the binary comparison between the file the Perl script created (on the left) and the file by matlab as a reference (on the right):
      http://srv2.jpg.co.il/8/53d2ed38850fb.jpg

      I'm going to sleep now,
      it's really late here :)
      Will return in the morning.

      Thanks tye for all your help!
      Koby

[reply]

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