Re: ARG?

[Ben Abbott]

On Jun 21, 2011, at 6:02 AM, Bazman76 wrote:

> Hi there,
> 
> The code below was posted at the following address:
> 
> http://www.quantcode.com/modules/mydownloads/singlefile.php?lid=495
> 
> Just wondered what significance the "1;" has (I am compltetly new to octave)
> 
> Also what does the following section do?
> 
> badidx=find(abs(arg(S))>0);
> nBad_values=size(badidx,1) %should ideally be zero
> goodidx=find(abs(arg(S))==0);
> 
> S=S(goodidx);
> 
> Also what does the arg function do? (more generally is there a resource
> where I can type in an octave function name and find out what it does?)
> 
> Thanks
> 
> Baz

The "1;" has no significance.

badidx is a vector in the indices of S where its phase is greater than zero.

nBad is the number of indices of S where its phase is greater than zero.

goodidx is a vector containing the indices of S where its phase is equal to 
zero.

Ben