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I'm trying to get a frequency plot, or PDF (probability density function) plot for my biometrics project in MATLAB. I have two vectors genuine_scores and impostor_scores, and I need to have a graph like:

x-axis : value of elements
y-axis : frequency of that value

So the graph should look like this : enter image description here

I tried probplot() but it gives the cumulative distrubition function

I also tried normpdf(); but it does not make sense to me. Because I'm not interested in a mean value. I just need how frequent each of the value appears in the vector(s).

Thanks for any help !

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    $\begingroup$ Have you tried stairs(x, y)? $\endgroup$
    – Juan M. Bello-Rivas
    Commented Mar 8, 2014 at 19:03

2 Answers 2

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I think hist (histogram plot) or bar (bar graph) may do the job.

http://www.mathworks.co.uk/help/matlab/ref/bar.html

http://www.mathworks.co.uk/help/matlab/ref/hist.html

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Matlab R2014b has this 'histogram' function which has the 'normalization' property, it may give what you want.

http://www.mathworks.com/help/matlab/ref/histogram.html#namevaluepairarguments

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