Two questions about "hist" function - Programmers Heaven

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# Two questions about "hist" function

Posts: 4Member
I have two questions about "hist". As you know, [n,xout] = hist(...) returns vectors n and xout containing the frequency counts and the bin locations.

a = [7 3 8 4 2 6 9 4 3];

[n,x] = hist(a,2);

Result:

n =

5 4

x =

3.7500 7.2500

1. How can I obtain the elements (or indexes of elements) which exist in the first interval or second interval? For instance, at the above example for first interval the elements {2,3,3,4,4} and for second interval the elements {6,7,8,9}.

2. How can I use the hist function when I have a Three dimensional vector (a matrix(3*3)) instead of a single dimensional vector?

• Posts: 217Member
1. In this case you can find the mean value of xout:

sep=mean(xout);

use the function find to have the positions of the elements of the two groups:

pos_group1=find(asep);

Find the values of the elements:
group1=a(pos_group1);
group2=a(pos_group2);

2. for matrixes you can use the hist function in this way:
b=[1 1 1 ; 2 1 1; 3 2 1];
hist(b(:),n);

b(:) signify "consider all the elements of b"
• Posts: 4Member
Very Thanks