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Re: writing integer with fwrite
From: |
John W. Eaton |
Subject: |
Re: writing integer with fwrite |
Date: |
Tue, 14 Dec 2004 09:38:27 -0500 |
On 14-Dec-2004, David Bateman <address@hidden> wrote:
| According to address@hidden <address@hidden> (on 12/14/04):
| > Hello and thanks for the quick answer,
| >
| > But it doesn't solve the problem.
| > The statement:
| > cnt=fwrite(fid, bytes,'uint32')
| > Returns cnt=2, so it uses two uint32 values to store the one variable,
| > in Matlab it returns cnt=1, converting the value bytes to a
| > 32bit-Integer before writing. I need it to store as a 4byte value when
| > using uint32.
| > Any ideas?
| > I am using the precompiled windows version 2.150 from sourceforge.
| > Is this perhaps a known bug?
|
| Use the uint32 from the latest versions of octave (2.1.64 for example)
| and cast as uint32 before calling fwrite
|
| cnt=fwrite(fid, uint32(bytes), 'uint32')
It seems that with 2.1.64 the explicit type conversion is not
necessary:
octave:1> fid = fopen ("x.out", "w");
octave:2> cnt = fwrite (fid, pi, "ulong")
cnt = 1
octave:3> cnt = fwrite (fid, pi, "uint32")
cnt = 1
octave:4> fclose (fid);
octave:5> fid = fopen ("x.out", "r");
octave:6> fread (fid, 1, "ulong")
ans = 3
octave:7> fread (fid, 1, "uint32")
ans = 3
This is on an x86 system running Debian.
BTW, the 2.1.50 snapshot was made almost 1-1/2 years ago. You should
really try a later version. 2.1.64 is the current "testing" or
"recommended" version.
jwe
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-------------------------------------------------------------
- Re: writing integer with fwrite, Reiner.Suikat, 2004/12/14
- Re: writing integer with fwrite, Robert A. Macy, 2004/12/14
- Re: writing integer with fwrite, David Bateman, 2004/12/14
- Re: writing integer with fwrite,
John W. Eaton <=
- Re: writing integer with fwrite, David Bateman, 2004/12/14
- Re: writing integer with fwrite, John W. Eaton, 2004/12/14
- Re: writing integer with fwrite, Andy Adler, 2004/12/14
- Packaging Octave for Windows and OS X (was: writing integer with fwrite), John W. Eaton, 2004/12/14
- Re: Packaging Octave for Windows and OS X (was: writing integer with fwrite), Joe Koski, 2004/12/14
- Re: Packaging Octave for Windows and OS X (was: writing integer with fwrite), John W. Eaton, 2004/12/14
- Re: Packaging Octave for Windows and OS X (was: writing integer with fwrite), Joe Koski, 2004/12/14
- Re: Packaging Octave for Windows and OS X (was: writing integer with fwrite), Paul Kienzle, 2004/12/14
- Re: Packaging Octave for Windows and OS X (was: writing integer with fwrite), Per Persson, 2004/12/16
- Re: Packaging Octave for Windows and OS X (was: writing integer with fwrite), Samir Sharshar, 2004/12/17