Re: How to leave out selected elements from a vector?

[Ben Abbott]

On Jul 18, 2008, at 5:28 PM, Jaroslav Hajek wrote:

> On Fri, Jul 18, 2008 at 11:17 PM, Shaun Jackman <address@hidden>  
> wrote:
> > Jaroslav Hajek wrote:
> > > On Fri, Jul 18, 2008 at 7:07 PM, Shaun Jackman <address@hidden>  
> > > wrote:
> > > > Bill Denney wrote:
> > > > ...
> > > > > or with a logical vector
> > > > > mask = false(size(list));
> > > > > mask(m:n) = true;
> > > > > list(mask)
> > > >
> > > > Woah! This blows my mind. How does a logical vector differ from a  
> > > > vector
> > > > of
> > > > integers? Example:
> > >
> > > Indexing by a boolean vector b is essentially the same as indexing  
> > > by find
> > > (b).
> >
> > How does octave know that the vector is of booleans and not  
> > integers? Where
> > is this type information stored, and how do I display it?
>
> Each high-level (i.e. not internal) value in Octave has type
> information associated with it. You can use "class" and "typeinfo" to
> inquire about the type.

You can type "whos" as the command line as well.

Ben