Histogram with counting number of "1" per bin

Hi,

I have the following data: The intensity of a stimulus can be varied on a certain range, subjects have to say then for each intensity, if they can perceive the stimulus. Out of this data I would like to plot a histogram - and so far I have not found any existent Matlab function to do so (?).

So say the data would look like:

A = [100 120 80 85 130 145 160 95 105 110 115 135 150;
      0   1   0  0   1  1   1   1  1   1   0   0   1]

and I would like to split up the range [80,160] into 4 bins and count the number of 1's for each bin.

Answer 1

[Image Analyst]

Try this:

A = [100 120 80 85 130 145 160 95 105 110 115 135 150];
counts = [ 0   1   0  0   1  1   1   1  1   1   0   0   1]
edges = linspace(80, 160, 5) % % 5 edges for 4 bins
myHistCounts = histcounts(A.*counts, edges)

works as long as your counts are only 0 and 1. You can have two of the same value, like 2 at 120 with a 1 as long as the 120's are separate, which I think they would be because each element is for one stimulus.

[Image Analyst]

If you have an old version of MATLAB, you can use histc() instead of histcounts().

[MiauMiau]

And how do I plot that afterwards?

[Image Analyst]

You can use plot() or bar(). I tend to prefer bar() for histograms.

bar(edges(1:end-1), myHistCounts, 'BarWidth', 1, 'FaceColor', 'b');

or something like that

Answer 2

[Ahmet Cecen]

A trick for that would be to covert that data into this:

 B=[120, 130, 145, 160, 95, 105, 110, 150];

basically keeping the only the values that has 1s below. Now you can use the hist function properly to get a histogram easily.

You can use the binranges argument to specify those bins from 80 to 160 by 20. Check:

 doc hist