plot pdf for a large size sequence

I have got a sequence with size of 1 million. I want to plot a pdf for this sequence by putting same values together. Does anyone have any idea?

[Azzi Abdelmalek]

putting same values together: What do you mean?

[EEE]

Thank you for your comment. For example, a sequence [1 1 1 1 1 1 2 2 2 2 3 3 3], so there are 5 1s, 4 2s and 3 3s. I want cumulate them so 1 has a magnitude of 5 and 2 has a magnitude of 4 and 3 has a magnitude of 3. Is this clear?

Answer 1

[Azzi Abdelmalek]

A=[1 1 1 1 1 1 2 2 2 2 3 3 3]
[a,b,c]=unique(A)
out=accumarray(c,A')  % corresponding to a'
[a' out]

[EEE]

Thanks!

Answer 2

[Image Analyst]

A million elements is not large at all - just a very small fraction of the number of elements in an ordinary digital image for example. It sounds like you just want the histogram. If you have all integers:

data = [1 1 1 1 1 1 2 2 2 2 3 3 3]
edges = 1 : max(data(:));
counts = histc(data, edges)

counts =
     6     4     3

Though perhaps I misunderstood because you have 5,4,3 instead of 6,4,3. Can you explain how you got the 5? Did you just ignore the first element or something???