Re: Unable to use findpeaks : Error:subscript indices must be either positive integers or logicals

[Ben Abbott]

On Jun 17, 2013, at 4:52 PM, debatri wrote:

> Hi,
> I am a new octave user. I tried to use "findpeaks" in the following block of
> code and is getting Error: subscript indices must be either positive
> integers or logicals. 
> t=[1:400]';
> f1=500;
> f2=4000;
> fs=24000;
> ts=1/fs;
> y1=sin(2*pi*f1/fs*t);
> y2=sin(2*pi*f2/fs*t);
> data1=2+(0.2*y1+y2);
> [pks idx] = findpeaks(data1);
> 
> Please help....

Looks like a bug.  Please file a bug-report.

        https://savannah.gnu.org/bugs/?group=octave

As a work around, try

         idx = find (circshift (data1, 1) < data1 & data1 > circshift (data1, 
-1));
        pks = data(idx);

Does that what you need?

Ben