how can i do that for all columns?

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Ach
Ach 2018-3-5
编辑： Stephen23 2018-3-13
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?

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回答（1 个）

Suraj Mankulangara
Suraj Mankulangara 2018-3-13
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.
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Stephen23
Stephen23 2018-3-13
编辑：Stephen23 2018-3-13
although to be safe, in case the size of the matrix might change in future:
sum(matrix,1)

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