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Re: Bizarre Error

From: Miquel Cabanas
Subject: Re: Bizarre Error
Date: Wed, 12 Feb 2003 09:44:14 +0100
User-agent: Mutt/1.3.28i

On Wed, Feb 12, 2003 at 03:30:01PM +1100, address@hidden wrote:
> Heres an interesting one:
> I created a menu system to read in all the files in a directory
> and then list them 10 at a time allowing users to change pages
> or to select a file.

why don't you use the menu () m-function available in Octave, it
seems to do the job you want.

as for the error,

> parse error:
> >>> load -force materials/B45505.mtl
> parse error:
> error: invalid character `' (ASCII 0) near line 49, column 45
> [...]
> >>> load -force materials/B45505.mtl
> error: evaluating for command near line 23, column 3

I'm not convinced it's related to str2num. I rather suspect it's
related to the use of "filelist(i,:)" in the eval () within the for

> filelist=filelist(mtlfiles,:);
> for i=Cpage_start:Cpage_finish
> loadline=['load -force materials/',filelist(i,:),' matname'];
> eval(loadline);

String matrices are padded with zeros so that all rows have
the same length, if you want to get a string back and use it without
problems you better strip it down and remove all extra space chars
from its end using deblank (). I.e.

octave:145> filelist
filelist =


octave:146> size (filelist)
ans =

   3  38

octave:147> size (filelist(1,:))
ans =

   1  38
octave:148> size (deblank (filelist(1,:)))
ans =

  1  8

octave:149> deblank (filelist(1,:)) 
ans = getmat.m

Try replacing

> loadline=['load -force materials/',filelist(i,:),' matname'];


> loadline=['load -force materials/',deblank (filelist(i,:)),' matname'];


Miquel E Cabanas ------------------------------------------------------
SeRMN, Universitat Autonoma de Barcelona (address@hidden)

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