calculating weighted sum of values in a matrix

Hello

I have a short question. I have csv file called "input.csv" which is a 51x3 matrix. I am reading the file and I have to calculate the sum and the weighted sum of the numbers. Weighted sum is the sum of any number multiplied by its row and column index starting at 1 and the sum is addition of all values of a matrix. I have done the sum but how to do the weighted sum. here is my code and I am attaching the file with the question.

a = csvread('input.csv');
S = sum(a,2);
S = sum(S); %1st part 

A picture of how the file looks like:

Answer 1

[Jonas]

short example for the weighting: each number is multiplied by its column index and row index

in=ones(3,2);
[X,Y]=meshgrid(1:size(in,2),1:size(in,1));
out=in.*X.*Y

the rest should be easy :)

[Chris Dan]

Thanks :))