Divide each element in a column by the sum of that column

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Leeba Chacko
Leeba Chacko on 4 Nov 2021
Commented: Stephen23 on 4 Nov 2021
I have a 2x10 matrix called A. I would like to find the sum of each column in A and divide individual elements in A by the sum for each column.
ex. A = [12 45 67 23 45 43 23 23 23 56
23 45 65 32 45 67 32 45 88 76];
B = sum(A) i.e [ 35 90 132 55 90 110 55 68 111 132];
Next, I want to divde 12 & 23 by 35, 45 and 45 by 90 and so on. How do I do this?

Answers (1)

Sreedevi K
Sreedevi K on 4 Nov 2021
iwant = A./sum(A)
  3 Comments
Stephen23
Stephen23 on 4 Nov 2021
Specify the dimension argument to avoid bugs if the matrix happens to contain just one column:
A = [12,45,67,23,45,43,23,23,23,56;23,45,65,32,45,67,32,45,88,76];
B = A./sum(A,1)
B = 2×10
0.3429 0.5000 0.5076 0.4182 0.5000 0.3909 0.4182 0.3382 0.2072 0.4242 0.6571 0.5000 0.4924 0.5818 0.5000 0.6091 0.5818 0.6618 0.7928 0.5758

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