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

[debatri]

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....




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