y = sum(X)
y = sum(X)
, where X
is a matrix, returns a row y
vector with the sum over each column. If X
is a vector, y
is the sum of the elements of X
.
This is called a magic square because the sum of the elements in each column is the same.M = magic(3)
M =
8 1 6
3 5 7
4 9 2
And the sum of the elements in each row, which can be obtained by transposing twice, is the same.sum(M) =
15 15 15
sum(M')' =
15
15
15
cumsum
,prod
,trace
(c) Copyright 1994 by The MathWorks, Inc.