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.TH matrix 3 "Ultrasonics Laboratory"
.SH NAME
matrix math routines
.SH SYNOPSIS
inv(a,b) - invert a three by three matrix
.br
mult(a,b,c,n,m,l) - multiply two matrixes
.br
float a[3][3],b[3][3],c[3][3];
.br
long n, m, l;
.SH DESCRIPTION
These two routines are simple math routines that
can be called from either C or Fortran.
The 
.B inv
routine simply calculates the inverse of the 
three by three matrix
.B a.
The result is left in the array
.B b.
.PP
The 
.B mult 
routine will multiply two matrixes of 
arbitrary size.
The files
.B a
and 
.B b
are the input files of
size (n x m) and (m x l)
respectfully.
The result is placed into the
array
.B c.
This result will be a
(n x l) array.
.SH BUGS
The inversion routine does not check for a singular
matrix.