Peak to Peak Distance Help

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Jake Larson
Jake Larson 2013-1-22
回答： Greg Dionne 2014-2-6
So I have a large data set of monthly averages which came in as a vector of 5000 or so points. I converted into 12x235 a matrix and then averaged each column to give me a vector of yearly averages for the data. The data resembles a sin curve and I need to find the distance between each peak. When I tried to use the peak to peak function, [pks,locs]=findpeaks(data,'minpeakdistance',3), it told me it could not compute it for type double. I tried converting to int and no luck. Please help.
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Image Analyst
Image Analyst 2013-1-23
Are you sure it says it "could not compute it for type double", or does it really say "
Error using findpeaks (line 43)
Input arguments must be 'double'.
"? Because that's the complete opposite of what you said.
Jake Larson
Jake Larson 2013-1-23
[pks,locs]=findpeaks(x,'minpeakdistance',3)
Undefined function 'findpeaks' for input arguments of type 'double'.
I have no clue why it won't work for type double?

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回答（2 个）

Leandro
Leandro 2013-1-22
编辑：Leandro 2013-1-22
The findpeaks needs data to be a double variable, not ints.
data=double(data)
[pks,locs]=findpeaks(data,'minpeakdistance',3)
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Jake Larson
Jake Larson 2013-1-23
I have it in doubles. This is the error i get
Undefined function 'findpeaks' for input arguments of type 'double'.

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Greg Dionne
Greg Dionne 2014-2-6
It looks like you don't have the Signal Processing Toolbox.
You get that error when you try accessing a function that doesn't exist.
Try:
>> [pks,locs]=completelyundefinedfunction(x,'minpeakdistance',3) Undefined function 'completelyundefinedfunction' for input arguments of type 'double'.

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