demo1.py

"""
pyrsb demo
"""

import numpy
import scipy
from scipy.sparse import csr_matrix
from pyrsb import *

V = [11.0, 12.0, 22.0]
I = [0, 0, 1]
J = [0, 1, 1]
c = csr_matrix((V, (I, J)))
print(c)
# several constructor forms, as with csr_matrix:
a = rsb_matrix((V, (I, J)))
a = rsb_matrix((V, (I, J)), [3, 3])
a = rsb_matrix((V, (I, J)), sym="S")  # symmetric example
print(a)
a = rsb_matrix((4, 4))
a = rsb_matrix(c)
nrhs = 1  # set to nrhs>1 to multiply by multiple vectors at once
nr = a.shape[0]
nc = a.shape[1]
order = "F"
x = numpy.empty([nc, nrhs], dtype=rsb_dtype, order=order)
y = numpy.empty([nr, nrhs], dtype=rsb_dtype, order=order)
x[:, :] = 1.0
y[:, :] = 0.0
print(a)
print(x)
print(y)
# import rsb # import operators
# a.autotune() # makes only sense for large matrices
y = y + a * x
# equivalent to y=y+c*x
print(y)
del a