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.TH prod G "April 1993" "Scilab Group" "Scilab Function"
.so ../sci.an
.SH NAME
prod - product
.SH CALLING SEQUENCE
.nf
y=prod(x)
y=prod(x,'r') or y=prod(x,1)
y=prod(x,'c') or y=prod(x,2)
.fi
.SH PARAMETERS
.TP
x
: real or complex vector or matrix
.TP
y
: real or complex scalar or matrix
.SH DESCRIPTION
For a vector or a matrix \fVx\fR, \fVy=prod(x)\fR returns in the scalar \fVy\fR the prod of all the entries
of \fVx\fR, , e.g. \fVprod(1:n)\fR is n!
.LP
\fVy=prod(x,'r')\fR (or, equivalently, \fVy=prod(x,1)\fR)computes the
rows elementwise product of \fVx\fR. \fVy\fR is the row vector: \fVy(i)=prod(x(i,:))\fR.
.LP
\fVy=prod(x,'c')\fR (or, equivalently, \fVy=prod(x,2)\fR) computes the
columns elementwise product of \fVx\fR. \fVy\fR is the column vector: \fVy(i)=prod(x(:,i))\fR.
.LP
\fVprod\fR is not implemented for sparse matrices.
.SH EXAMPLE
.nf
A=[1,2;0,100];
prod(A)
prod(A,'c')
prod(A,'r')
.fi
.SH SEE ALSO
sum, cumprod
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