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Creating a frequency table

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googo
googo 2013-5-31
Hello,
suppose I have a vector in legnth of 100 that contains a number between 1-4 how can I make a frequncy vector using the data in the vector? I'd tryed the function tabulate but if there is no 4 or 3 for example it will not be in the table and I want it to be there just with the value 0.
Thank's!
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googo
googo 2013-5-31
编辑：googo 2013-5-31
Ok, sorry.
For example : [4 3 2 2 4 3 3] {only numbers between 0-4}
I'm looking for a function that will return a frequency vector :
0
0
2
3
4
Image Analyst
Image Analyst 2013-5-31
编辑：Image Analyst 2013-5-31
That's simply the histogram - I think - and you can use histc() or hist(). It's "I think" because I'm not sure why you say there are four 4's when I only see 2. The histogram would say there is two 4's in [4 3 2 2 4 3 3]. Perhaps you can explain your thought process around how you came up with four 4's.

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采纳的回答

Azzi Abdelmalek
Azzi Abdelmalek 2013-5-31
a=arrayfun(@(z) sum(ismember(x,z)),0:4)'
out=[(0:4)' a 100*a/numel(x)]

更多回答（2 个）

Andrei Bobrov
Andrei Bobrov 2013-5-31
x=[1 1 2 2 1 2 ];
a = histc(x(:),0:4);
out = [(0:4)', a, a/sum(a)*1e2];
Azzi Abdelmalek
Azzi Abdelmalek 2013-5-31
x=[1 1 2 2 1 2 ]
y=[x 5]
out=tabulate(y)
out(end,:)=[]
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Iman Ansari
Iman Ansari 2013-5-31
x=[1 1 2 2 1 2 ];
[0:4 ;histc(x,0:4)]'
Azzi Abdelmalek
Azzi Abdelmalek 2013-5-31
Iman , make it as an answer

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