Re: Error with pkg.m (== isspace does work with cell arrays anymore)

[Daniel J Sebald]

John W. Eaton wrote:
> On 24-Feb-2008, Michael Goffioul wrote:
>
> | I have an error with recent mercurial code, in pkg.m. It reduces to
> | the fact that isspace does not work anymore on cell array of
> | strings. The error occurs around line 1299:
> | 
> |   if (! all (isspace (filenames)))
> | 
> | where filenames is a cell array of strings. I'm not sure what's
> | the correct way to fix this.
>
> I could probably help if I knew what isspace should do for a cell
> array.  Matlab appears to do this:
>
>   >> isspace ({' ', ' ', ' '})      
>
>   ans =
>
>        0     0     0
>
>
> Which makes no sense to me.  Is this behavior useful in some way that
> I'm not seeing?

Well, in that case the question is whether the cell is a space, which I suppose 
it isn't.  Consider:

octave:14> ['left' ' ' 'right']
ans = left right
octave:15> ['left' {' '} 'right']
error: concatenation operator not implemented for `sq_string' by `cell' 
operations
octave:15> ['left' {' '}{} 'right']
ans = left right

Dan