Help to build the logic to plot peak vs time
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t = 0:0.1:10;
y = 15*sin(pi*t);
[a,b]=peakdetection(y,0.5);
if y(i) == a;
y(i) = y(i);
else
y(i)= 0;
end
In this i want to detect peak and valley from any type of signal. After detecting i want to plot only peak against time. All other value of y (except peak) should be zero as per my requirement.
I will appreciate if anybody help me to build this logic. I tried to use if loop but it is given error
??? Subscript indices must either be real positive integers or logicals.
Error in ==> Untitled at 7
if y(i) == a;
Regards
Jeevan Patil
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David
2012년 1월 19일
i is an imaginary number by default causing your error.
Wrap your code in a for loop
for ii=1:length(y)
if y(ii)~=a
y(ii)=0;
end
end
However you might find difficulties comparing floating point numbers. You may need to have some sort of compare function:
realCmp = @(x,y) abs(x-y)<1000*sqrt(eps)
And use
if ~realCmp(y(ii),a)
However even better that that you should use
y(~realCmp(y,a))=0;
and avoid the for loop altogether
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