# New Features for Mx 1.19

#### Multiple matrix algebra formulae within a group.

Example:
Title demonstrate algebra function
Data calc NGroups=1
Matrices
M Full 2 2
N Full 2 2
Begin algebra;
Y = M*N;
C = Y|N;
End algebra;
Compute C|Y ;
Matrix M
1 2 3 4
Matrix N
5 6 7 8
Opt rs
End

Note that the left hand side of algebra statements (Y and C in the above
example) must be matrices that have not yet been defined in that group.
Computed matrices will be printed in the output (unless suppressed by option
No_Output). This feature should greatly reduce the complexity of scripts that
previously required a calculation group for each matrix formula desired.

Also note the use of ; as a synonym for / to indicate the end of a
formula. Beware of forgetting the end algebra statement.

#### Command line length

The previous limit of 120 characters has been raised to 1200 on most
systems,
though the IBM RS6000 compiler won't buy more than 500 which is therefore the
limit under Aix.

**Mike Neale, neale@gems.vcu.edu, Medical College of
VA**