# Meschach: Matrix computations in C

Meschach is a C-language library of routines for performing matrix
computations.
It has a collection of data structures which are self-contained, can be
created, destroyed and resized at will which includes permutations,
vectors, matrices, integer vectors, complex vectors and matrices and sparse
matrices.

## Example of use

Meschach code looks like this:
main()
{
MAT *A, *Acopy;
VEC *b, *x;
PERM *pivot;
A = m_input(MNULL); /* read in matrix from stdin */
Acopy = m_copy(A,MNULL); /* create & copy matrix */
b = v_input(VNULL); /* read in vector from stdin */
pivot = px_get(A->m); /* get pivot permutation -- size = # rows of A */
LUfactor(A,pivot); /* LU factorisation */
x = LUsolve(A,pivot,b,VNULL); /* ... and solve A.x = b; result is in x */
/* .... and print out solution with a comment */
printf("# x =\n"); v_output(x);
}

For information on the manual, see the bottom of this page.
## What's here?

The files in this directory include:
README

FAQ.meschach: Meschach's Frequently Asked
Questions (with answers)

mesch12a.announce: Announcement notice for
version 1.2

User's contributions

Partial online manual

mesch12b.index:
Netlib index entry for new version

mesch12b.tar.Z: tar file containing complete
library (compress'd)

mesch12b.tar.gz ....(gzip'd)

mesch12b.zip ....(zip'd)

BinHex4.0'd Mac setup file for Think C
courtesy of Brent Boyer (boyer@jumpjibe.stanford.edu)

meschach0.shar.Z: shar file containing core
routines (compress'd)

meschach0.shar.gz ....(gzip'd)

meschach1.shar.Z: shar file containing basic
matrix operations (compress'd)

meschach1.shar.gz ....(gzip'd)

meschach2.shar.Z: shar file containing matrix
factorisations (compress'd)

meschach2.shar.gz ....(gzip'd)

meschach3.shar.Z: shar file containing sparse
and iterative methods (compress'd)

meschach3.shar.gz ....(gzip'd)

meschach4.shar.Z: shar file containing
complex operations (compress'd)

meschach4.shar.gz ....(gzip'd)

oldmeschach.shar.Z: shar file containing
old iterative routines (compress'd)

oldmeschach.shar.gz ....(gzip'd)

rcs_logs: Change log a la RCS

version1.1b: Directory for version 1.1b

version1.2a: Directory for version 1.2a

## For more information...

For more information about Meschach, email
*david.stewart@anu.edu.au* or *zbigniew.leyk@anu.edu.au*
The Meschach 1.2 manual (*Meschach: Matrix Computations in C*)is
published by the *Centre for Mathematics and its Applications, School of
Mathematical Sciences, Australian National University, Canberra, ACT 0200,
Australia*.
To order your copy send a message to the above address by paper mail, or
send an order over email to *jillian.smith@anu.edu.au* with your paper
mail address.
Cost: about A$30 (that's roughly US$22) + postage and handling.
You can pay on delivery by international money order, credit/charge card
etc. on delivery.

Note: There is also the tutorial chapter of the manual in ASCII form
distributed with Meschach.

David Stewart,
Advanced Computation Group,
School of Mathematical Sciences,
Australian National University
des@thrain.anu.edu.au