Average of matrix element

Suppose i have a 4X1 matrix like [a;b;c;d]. Now i want the output as [a;(a+b)/2;(a+b+c)/3;(a+b+c+d)/4].

How to do that?

[Jos (10584)]

Answered! Great minds, as well as mine, think alike ;-)

Answer 1

[Walter Roberson]

x = [a;b;c;d];
cumsum(x) ./ (1:numel(x))

Answer 2

[Adam]

cumsum( [a; b; c; d] ) ./ ( 1:4 )';

Answer 3

[madhan ravi]

cumsum(matrix)./(1:numel(matrix)) % where matrix is a column vector

Answer 4

[Jos (10584)]

One easy option

A = [10 20 30 40]
B = cumsum(A) ./ (1:numel(A))