how can i do that for all columns?

hi , i have a matrix (length(a),length(b)) and i want to write a function that calculates the sum of all a in a column. how can i do that for all columns?

Answer 1

[Suraj Mankulangara]

Hi Ach

The "sum" function in MATLAB returns the total of all elements in a column (or row) of a matrix. For more information on how to use the sum function, you can refer to the link below:

https://in.mathworks.com/help/matlab/ref/sum.html

By default, the "sum" function computes column-wise total of elements in a matrix, so in your case,

sum(matrix)

should get you the result that you want.

[Stephen23]

although to be safe, in case the size of the matrix might change in future:

sum(matrix,1)