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cumsum(1) Scilab Function cumsum(1)
NAME
cumsum - cumulative sum
CALLING SEQUENCE
y=cumsum(x)
y=cumsum(x,'r') or y=cumsum(x,1)
y=cumsum(x,'c') or y=cumsum(x,2)
PARAMETERS
x : vector or matrix (real or complex)
y : vector or matrix (real or complex)
DESCRIPTION
For a vector or a matrix x, y=cumsum(x) returns in y the cumulative sum of
all the entries of x taken columnwise.
y=cumsum(x,'c') (or, equivalently, y=cumsum(x,2)) returns in y the cumula-
tive sum of the columns of x: y(i,:)=cumsum(x(i,:))
y=cumsum(x,'r') (or, equivalently, y=cumsum(x,1)) returns in y the cumula-
tive sum of the rows of x: y(:,i)=cumsum(x(:,i))
EXAMPLE
A=[1,2;3,4];
cumsum(A)
cumsum(A,'r')
cumsum(A,'c')
a=rand(3,4)+%i;
[m,n]=size(a);
w=zeros(a);
w(1,:)=a(1,:);
for k=2:m;w(k,:)=w(k-1,:)+a(k,:);end;w-cumsum(a,'r')
SEE ALSO
cumprod, sum
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