how to count number of values exceeding given threshold in moving window

I want to calculate # of values exceeding specified threshold (m) with a moving window of length w (so that we omit the 1st sample and add another sample) I have a data of 1500 samples. In matlab r2013 thanx

Answer 1

[Guillaume]

If I understood correctly:

v = [1 2 3 4 5 6 5 4 3 2 1 2 3 4 5 6];  %demo data
threshold = 4;
windowsize = 5;

abovethreshold = v > threshold;
inwindowabovethreshold = conv(abovethreshold, ones(1, windowsize), 'same')

If you were using R2016a or later, you could use movsum instead of the awkward convolution.

[riki ragùa]

 v = [1 2 3 4 5 6 5 4 3 2 1 2 3 4 5 6];  %demo data
threshold = 4;
windowsize = 5;

abovethreshold = v > threshold; inwindowabovethreshold = conv(abovethreshold, ones(1, windowsize), 'same') Error using conv2 First and second arguments must be single or double.

Error in conv (line 39) c = conv2(a(:),b(:),shape);

[Guillaume]

inwindowabovethreshold = conv(double(abovethreshold), ones(1, windowsize), 'same')

Should solve that problem (which isn't one in newer versions)

[riki ragùa]

thank yoù

[Image Analyst]

Same answer I would have given. If it solves your problem, you can "Accept this answer", and vote for it, to thank Guillaume by giving him reputation points.

[riki ragùa]

it's done .