save and load bug.

[Ben Abbott]

On Dec 24, 2008, at 11:55 PM, GARY FORBIS wrote:

> OK, it's been awhile since I've tried GNU Octave.  I'm running vista  
> with octave-3.0.3.
> It's much better than 3.0.1.  I'm back to learning the language by  
> running an existing program.
> It did a save in several places then loaded the files back in  
> later.  Unfortunately they didn't load.
>
> I used this unix command to help me track down the problem:
>
> $ head -n 6 mnistvhclassify| cut -d\  -f-1000 >garytest2;tail -n 1  
> garytest2 | wc
>       1     500   10420
>
> and modified the number of rows and columns until it quit failing.
>
> This one worked:
> $ head -n 6 garytest2| cut -d\  -f-190 >garytest1;tail -n 1  
> garytest1 | wc
>       1     189    3943
>
> This one failed:
> $ head -n 6 garytest2| cut -d\  -f-191 >garytest1;tail -n 1  
> garytest1 | wc
>       1     190    3964
>
> There's nothing interesting about the number of characters near  
> these numbers so I wrotethis:
>
>  a=0.0877672686001518
>  b=[]
>  for x=1:500
>  b=[b,a]
>  save stest b
>  load stest
>  end
>
> and it worked all the way thru.
>
> $ tail -n 1 stest | wc
>       1     500    9502
>
> so I took the last value in the file that failed,  
> -0.03597396637549816, and reran the program and it fail with this  
> size:
>
> $ tail -n 1 stest | wc
>       1     384    8066
>
> The problem appears to have nothing to do with the number of  
> characters in the row.
> Then I counted the number of negative number:
>
> $ tail -n 1 garytest1 | sed 's/[^-]//g' | wc
>       1       1     191
>
> but that's only half of the place where the simple program failed.
> I don't get it.
>
> Any ideas?
>
> Thanks.

I tried a simple version

	a = -rand (1, 500);
	save -text test.txt a
	clear all
	load test.txt
	whos a

Running both 3.0.3 and the developers sources load() appears to work.

I you are unable to produce a simple example which demonstrates the  
problem, can you attach a file that doesn't load so that it may be  
examined?

Ben