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sum(1) Scilab Function sum(1)
NAME
sum - sum (row sum, column sum) of vector/matrix entries
CALLING SEQUENCE
y=sum(x)
y=sum(x,'r') or y=sum(x,1)
y=sum(x,'c') or y=sum(x,2)
PARAMETERS
x : vector or matrix (real, complex, sparse or polynomial)
y : scalar or vector
DESCRIPTION
For a vector or a matrix x, y=sum(x) returns in the scalar y the sum of
all the entries of x.
y=sum(x,'r') (or, equivalently, y=sum(x,1)) is the rowwise sum. It returns
in each entry of the row vector y the sum of the rows of x (The sum is per-
formed on the row indice : y(j)= sum(x(i,j),i=1,m)).
y=sum(x,'c') (or, equivalently, y=sum(x,2)) is the columnwise sum. It
returns in each entry of the column vector y the sum of the columns of x
(The sum is performed on the column indice: y(i)= sum(x(i,j),j=1,n))).
EXAMPLE
A=[1,2;3,4];
trace(A)-sum(diag(A))
sum(A,'c')-A*ones(2,1)
sum(A+%i)
A=sparse(A);sum(A,'c')-A*ones(2,1)
s=poly(0,'s');
M=[s,%i+s;s^2,1];
sum(M),sum(M,2)
SEE ALSO
cumsum, prod
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