Load binary data from XML file

[Martin Weiser]

On Thu, 4 Jun 2009, Matthias Brennwald wrote:

> Dear all
>
> I'm trying to get some data in binary format from an XML file into
> Octave. I tried two approaches:
>
> 1. I tried xmlread that comes with Octave forge. This does not like my
> XML file, so I gave up.
>
> 2. I tried XML Tools from Matlab Central (
> http://www.mathworks.ch/matlabcentral/fileexchange/1742 ) with its OCT
> file incarnation discussed at
> https://www-old.cae.wisc.edu/pipermail/octave-maintainers/2006-June/000277.html
> . This works nicely by doing the following in Octave:
>
> fid=fopen('~/Desktop/F004.mzML');
> s=char(fread(fid,[1,Inf],'char'));
> fclose(fid);
> list=xmlstruct(char(s));
>
> Now 'list' is a struct containing the different XML elements, including
> the block of binary data stored in the XML file. However, the
> corresponding struct element in Octave is a string/char variable
> containing the hex code, which reflects my binary data. Here's the
> beginning of the hex code:
>
> APDDxQCkA8YAzAPGAOCwxQBAtcUAbA7GAPDmxQC8GMYAGAjGAIwbxgAo/8UAaPbF...
>
> This should correspond to a series of float numbers. How can I convert
> this string/char variable into numbers?
>
> Matthias
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>
>
Hello,
just a wild guess: try to find the character that separates them (xQ ?), 
separate them (see string manipulating functions in the manual) and use 
octave function hex2dec
HTH.
Martin