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.TH "COMPOSE MATRIX" 3P "29 February 1991"
.SH NAME
COMPOSE MATRIX  \- generate the composition of two homogeneous
\s-2\&2D\s+2 matrices
.SH SYNOPSIS
.SS C Syntax
.ft B
.ta 1.25i 3i
.nf
void
pcompose_matrix ( a, b, error_ind, m )
Pmatrix	a;	\fImatrix a\fP
Pmatrix	b;	\fImatrix b\fP
Pint	*error_ind;	\fI\s-2OUT\s+2 error indicator\fP
Pmatrix	m;	\fI\s-2OUT\s+2 result matrix\fP
.fi
.ft R
.SS Required PHIGS Operating States
(PHOP, *, *, *)
.SH DESCRIPTION
.SS Purpose
Use \s-2COMPOSE MATRIX\s+2 to produce a \s-2\&2D\s+2 (3\ \(mu\ 3) homogeneous matrix
that is the composition (matrix multiplication product) of two specified
3\ \(mu\ 3 matrices.
.LP
The returned matrix may be passed to the \s-2SET LOCAL TRANSFORMATION\s+2
and \s-2SET GLOBAL TRANSFORMATION\s+2 functions, or to any \s-2PHIGS\s+2 function
accepting a parameter of type Pmatrix.
.SS C Input Parameters
.IP "\fIa\fP, \fIb\fP"
The \s-2\&2D\s+2 (3\ \(mu\ 3) matrices used to calculate the composition matrix.
Matrices are specified as a Pmatrix array defined in phigs.h as follows:
.IP
typedef  Pfloat  Pmatrix[3][3];
.LP
.SS C Output Parameters
.IP \fIerror_ind\fP
A pointer to the location to store the error number of any error detected
by this function.
.IP \fIm\fP
The resulting composition matrix.
.SS Execution
\s-2COMPOSE MATRIX\s+2 returns a 3\ \(mu\ 3 matrix that is the result of
multiplying the two specified matrices \fIa\fP and \fIb\fP:
.IP
\fIresult\fP = \fIa\fP \s-2x\s+2 \fIb\fP
.SH ERRORS
.IP 002
Ignoring function, function requires state (\s-2PHOP, *, *, *\s+2)
.SH SEE ALSO
.nf
.IP
.ta 0.5i
.SM "COMPOSE MATRIX 3 (3P)"
.SM "COMPOSE TRANSFORMATION MATRIX (3P)"
.SM "BUILD TRANSFORMATION MATRIX (3P)"
.SM "SET LOCAL TRANSFORMATION (3P)"
.SM "SET GLOBAL TRANSFORMATION (3P)"
.fi