Re: More DLD mysteries

[JD Cole]

Al,
   This is a shot in the dark, but I imagine any() and all () return a 
Matrix so that no generality is lost when dealing with N-dimensional 
matrices.

JD

Al Niessner wrote:

> Sorry it took so long, but I am just getting back to this. So, if Matrix
> is two dimensional and any() and all() reduce the order by one, then why
> do they return a Matrix? ColumnVector and RowVector are the one
> dimensional counterparts. I would then think that ColumnVector any() or
> all() would reduce to a scalar (boolean actually). However, there is no
> any() or all() for {Column,Row}Vector.  So, I have to do something like:
>
> ColumnVector c;
>
> ...
> c = ...;
> if ((Matrix(c) < SomeDelta).bool_matrix_value().any()(0,0))
> {
>   ...do something significant maybe...
> }
>
> The point here being I have no idea if the conditional in the C++ if
> statement is the same as my m-file of 'if (any(c < SomeDelta))'. There
> is nothing in any header file in the include/octave... directory that
> helps to clear it up. It does compile, so we will see.
>
> Thanks for the help.




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