Hi,,is there anyone who could suggest any way of calculating the weight of a matrix row-wise?

Example,,say I have a matrix

 A=[1 0 0 1;
    0 1 0 1; 
    1 1 1 1; 
    1 1 0 1]

how do I calculate that how many rows have one 1's? how many have two 2's and so on?

Answer 1

[John BG]

with

h=histogram(sum(A,2),[0:5])
count=h.Values
     0     0     2     1     1

you have the result in the variable count, reading:

0 rows have null '1', 0 rows have one '1', 2 rows have two '1', 1 row has three '1' and 1 row has four '1'.

the histogram field to the right, filled with [0:5] defines the histogram bin edges: 4 bins need 5 edges.

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thanks in advance

John

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Answer 2

[Andrei Bobrov]

accumarray(sum(A,2)+1,1)