Re: C++ template

[Stefan van der Walt]

I am not sure what you mean, since all the examples listed under "Linear
Indexing" in the document below works as stated.

octave:1> a = ones(5,5)
a =

  1  1  1  1  1
  1  1  1  1  1
  1  1  1  1  1
  1  1  1  1  1
  1  1  1  1  1

octave:2> a(6)==a(1,2)
ans = 1

Which compares the 6th element of 'a' to the second in the first row.
If you want to compare a(6) to the first two elements, you have to do

octave:6> a(6)==a(1:2)

or 

octave:7> a(6)==a([1 2])

Regards
Stefan

On Mon, Oct 04, 2004 at 04:46:22AM -0500, Fredrik Bulow wrote:
> hmm....
> 
> Linear indexing (i.e. a(6)==a(1,2) for a 5x5 matrix) does not seem to be
> implemented yet. Or can it be turned on in some way? (Linear indexing is
> described in the below link.)
> 
> The "find" function seems to be built on the idea that linear indexing
> is available since find(eye(5)) does return [1 7 13 19 25]'.
> 
> /Fredrik
> 
> On Mon, 2004-10-04 at 07:19, Paul Thomas wrote:
> > Fredrik Bulow wrote:
> > 
> > >Thank you!
> > >  
> > >
> > You are more than welcome.
> > 
> > >  
> > >
> > Most octave programmes can be vectorised, although it is not always 
> > obvious how.  All that applies to Matlab, in this area, applies to 
> > octave as well.  The following technical note is therefore very useful 
> > and should be read by all octave/Matlab/Scilab/... users, regardless of 
> > which they use:
> > 
> > http://www.mathworks.com/support/tech-notes/1100/1109.html
> > 
> > The speedup that can be obtained is often more than that from writing a 
> > dynamically linked function - especially if the development time of the 
> > latter is taken into account.
> > 
> > Best regards
> > 
> > Paul T
> > 
> 
> 
> 
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Octave is freely available under the terms of the GNU GPL.

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