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how to have a vector that counts how many repetitive numbers there is in another vector?

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Pedro Vicente
Pedro Vicente 2018-8-17
回答： Andrei Bobrov 2018-8-17
So i have a vector with 100 numbers. And those numbers only goes until 51.
For example A = [ 50 49 32 21 50 38 41 2 46.....]
And what i want is a vector B that has 51 numbers and tells me for example how many 1's there is in vector A, and how many 2's there's in the vector and so on.
Thank you

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采纳的回答

madhan ravi
madhan ravi 2018-8-17
Maybe try this example:
A = [1 2 3 3 4 5 1]
u = unique(A)
Expected_result = histc(A,u)

更多回答（2 个）

Image Analyst
Image Analyst 2018-8-17
Do you mean the histogram?
% Make a vector with 1000 numbers in the range 1 - 51.
A = randi(51, 1, 1000)
% count frequency of each number
histObj = histogram(A)
grid on;
title('Histogram of A', 'FontSize', 17);
xlabel('A Value', 'FontSize', 17);
ylabel('Count', 'FontSize', 17);
% Get counts.
counts = histObj.Values
% Get bin edges.
edges = histObj.BinEdges
% Get bin centers.
binCenters = (edges(1:end-1) + edges(2:end)) / 2
Andrei Bobrov
Andrei Bobrov 2018-8-17
out = [(1:51)',histcounts(A,1:52)']

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