Creating a frequency table

2013 5 31
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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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Azzi Abdelmalek
Azzi Abdelmalek 2013-5-31
This is not clear
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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Azzi Abdelmalek
Azzi Abdelmalek 2013-5-31

0 个投票

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

1 个投票

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

0 个投票

x=[1 1 2 2 1 2 ]
y=[x 5]
out=tabulate(y)
out(end,:)=[]

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googo
googo 2013-5-31
>> x=[1 1 2 2 1 2 ];
y=[x 5];
out=tabulate(y);
out(end,:)=[];
>> out
out =
1.0000 3.0000 42.8571
2.0000 3.0000 42.8571
3.0000 0 0
4.0000 0 0
it was suppose to be
0 0 0%
1 3 50%
2 3 50%
3 0 0%
4 0 0%
didn't understand the purpose of the "5" in your code. Thank's!
Azzi Abdelmalek
Azzi Abdelmalek 2013-5-31
You said between 1 and 4
googo
googo 2013-5-31
编辑：googo 2013-5-31
ho... sorry.. my mistake but anyway why it's 42.85% an not 50%?
Azzi Abdelmalek
Azzi Abdelmalek 2013-5-31
编辑：Azzi Abdelmalek 2013-5-31
If there is no 4 in your list, tabulate will not show 4 0 0 like you said, To resolve the problem,I've added 5 and removed its result
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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