/usr/lib/python2.7/dist-packages/SparsExamples/umftest.py is in python-sparse-examples 1.1-1.2build1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 | from pysparse import spmatrix
from pysparse import umfpack
import Numeric
from pysparse import poisson
l = spmatrix.ll_mat(5, 5)
l[0,0] = 2.0
l[0,1] = 3.0
l[1,4] = 6.0
l[1,0] = 3.0
l[1,2] = 4.0
l[2,1] = -1.0
l[2,2] = -3.0
l[2,3] = 2.0
l[3,2] = 1.0
l[4,1] = 4.0
l[4,2] = 2.0
l[4,4] = 1.0
b = Numeric.array([8.0, 45.0, -3.0, 3.0, 19.0], "d")
x = Numeric.zeros(5, "d")
umf = umfpack.factorize(l)
umf.solve(b, x, 'UMFPACK_A')
print umf.getlists()
print x
print "------------------------------"
n = 50
L = poisson.poisson2d_sym_blk(n)
b = Numeric.ones(n * n, 'd')
x = Numeric.zeros(n * n, 'd')
umf = umfpack.factorize(L)
umf.solve(b, x, 'UMFPACK_A')
r = Numeric.zeros(n * n, 'd')
L.matvec(x, r)
r = b - r
print 'norm(b - A * x) = %f' % Numeric.sqrt(Numeric.dot(r, r))
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