From help-octave-request at bevo dot che dot wisc dot edu Sat Dec 27 16:58:37 2003
Subject: Re: Syntax befuddlement
From: "Dmitri A. Sergatskov" <dmitri at unm dot edu>
To: Joe Koski <jkoski11 at comcast dot net>
Cc: Octave_post <help-octave at bevo dot che dot wisc dot edu>
Date: Sat, 27 Dec 2003 15:59:22 -0700


Joe Koski wrote:
>
> 
> octave:2> t=[0.002:0.001:0.007]
> t =
> 
>   0.0020000  0.0030000  0.0040000  0.0050000  0.0060000  0.0070000
> 
> octave:3> fnormhat=0.5*(angle(-x(t+1).*conj(x(t-1)))+pi)/(2*pi)
                                    ^^^          ^^^^
t here is an index for x vector. For your t,  t-1 is rounded to -1
and x(-1) is undefined (index should be a positive integer)...

> error: invalid vector index = -1
> error: evaluating argument list element number 1
...

Also conj(x)==x, if x is real.

Regards,

Dmitri.



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