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Finding peaks with a set amplitude range?

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HC98
HC98 2023-2-10
回答： Star Strider 2023-2-12
I'm findint the peaks in a signal wich have an amplitude between 0.2 and 1. Trouble is when I call findpeaks via
[pks,locs] = findpeaks(data(1, :),x); %,x);
logicalIndexes = (pks > 0.8) & (pks < 1);
It just returns a bunch of zeros even though I told it not to. Any ideas?

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回答（2 个）

Mathieu NOE
Mathieu NOE 2023-2-10
Ran in:
hello
see the demo code below :
n = 100;
x= 1:n;
y = rand(1,n);
[pks,locs] = findpeaks(y,x);
logicalIndexes = (pks > 0.8) & (pks < 1);
ind = locs(logicalIndexes);
plot(x,y,x(ind),y(ind),'dr');
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HC98
HC98 2023-2-10
How can I get the corresponding x value for the peaks?
Mathieu NOE
Mathieu NOE 2023-2-12
hello again
the x and y values of the peaks as shown above in my demo code are x(ind),y(ind)
n = 100;
x= 1:n;
y = rand(1,n);
[pks,locs] = findpeaks(y,x);
logicalIndexes = (pks > 0.8) & (pks < 1);
ind = locs(logicalIndexes);
plot(x,y,x(ind),y(ind),'dr');

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Star Strider
Star Strider 2023-2-12
‘It just returns a bunch of zeros even though I told it not to. Any ideas?’
It may seem that a logical vector is returning zeros (false values, and there may be many zeros in it), however if you use:
NonZeroNr = nnz(logicalIndexes)
to find the number of true values, or:
NumericalIndices = find(logicalIndexes)
to return the subscript indices associated with the true values.
.

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