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.

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.

The files in this directory include:

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

mesch12a.announce: Announcement notice for version 1.2

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 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, Department of Mathematics, University of Iowa.