help please why ??
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A = [ 1 3 2 6 ; 5 7 7 0 ; -2 6 -2 1 ] ;
j = sum(A(1))
j= 1 why ???
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Accepted Answer
Jim Riggs
on 28 Feb 2018
the statement
sum(A(1))
is summing only the first element in A, which is 1.
If you want to sum the first row, it should be
sum(A(1,:))
and if you want to sum the first column, it is
sum (A(:,1))
3 Comments
Jim Riggs
on 28 Feb 2018
The matrix A is:
1 3 2 6
5 7 7 0
-2 6 -2 1
The first element in A is A(1) which is 1. So the statement
sum(A(1))
is the same as
sum(1)
and has a value of 1.
More Answers (1)
elham kreem
on 28 Feb 2018
WHAT are you want? IF YOU want to sum all the values then use Sum (A) BUt you sum the first element only. IF you help this answer then except to it.
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