Re: Bizarre Error

[Miquel Cabanas]

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
loop.

> 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 =

getmat.m
getmatv.m
pand9613.m

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'];

with

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




Miquel



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