Library Functions -- $%MTXMUL^MATH

Approved for inclusion in a future ANSI M[UMPS] language standard as part of the library for Matrix Mathematics.

This function multiplies two matrices, and returns the result in a third matrix. The result matrix may not be either of the source matrices.

Assuming that the matrices DEMO and INV are as in the example with the function MTXINV, then the function call


will return the value 1 in X and as matrix R:

1   0   0   0
0   1   0   0
0   0   1   0
0   0   0   1

Assuming that the matrices A and B contain:

        A                        B      
 1    2   -1    0           3    1    2
 4    0    2    1          -4    5   -2
 2   -5    1    2           1    0    3
                            2    3   -1

then the function call SET X=$%MTXMUL^MATH(.A,.B,.R,3,4,3) will return the value 1 in X and as the matrix R:

 -6   11   -5
 16    7   13
 31  -17   15

The MDC has approved code to approximate the return value of this function. Implementors are encouraged to provide more accurate and efficient code). Click here to view or download the code for this function. Click here to view or download the code for all M[UMPS] Library Functions.

This document is © Ed de Moel, 1995-2005.
It is part of a book by Ed de Moel that is published under the title "M[UMPS] by Example" (ISBN 0-918118-42-5).
Printed copies of the book are no longer available.

This document describes the various library functions that are defined for the M[UMPS] programming language.

The information in this document is NOT authoritative and subject to be modified at any moment.
Please consult the appropriate (draft) language standard for an authoritative definition.

In this document, information is included that will appear in future standards.
The MDC cannot guarantee that these 'next' standards will indeed appear.