adding each element of a matrix by previous elements of that row.

Hey guys,

I have a matrix and I want to make a new matrix in such a way in each row, each element is the summ of the prevous elements + current element divided by the number of elements. for example if

a = [1 2 3;4 5 6;7 8 9]

a = 3×3

1 2 3 4 5 6 7 8 9

is the first matrix, the second matrix should be;

b = [1 3/2 6/3; 4 9/2 15/3; 7 15/2 24/3]

b = 3×3

1.0000 1.5000 2.0000 4.0000 4.5000 5.0000 7.0000 7.5000 8.0000

Answer 1

[Star Strider]

Try this —

a = [1 2 3;4 5 6;7 8 9]

a = 3×3

1 2 3 4 5 6 7 8 9

acs = cumsum(a,2)

acs = 3×3

1 3 6 4 9 15 7 15 24

b = acs ./ (1:size(a,2))

b = 3×3

1.0000 1.5000 2.0000 4.0000 4.5000 5.0000 7.0000 7.5000 8.0000

ratsb = rats(b)

ratsb = 3×42 char array
    '       1            3/2            2      '
    '       4            9/2            5      '
    '       7           15/2            8      '

Experiment to get different results.

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[mohsen ebneali]

tnx

[Star Strider]

As always, my pleasure!

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