Hi,

I tried to post results but the file is too big, anyway, here is the benchmark program if you want to run it:

Nicolas

-----

import time
import numpy
from scipy import sparse

def benchmark(xtype = 'numpy.array', xdensity = 0.1,
              ytype = 'numpy.array', ydensity = 1.0, n = 1000):

    x = numpy.zeros((n,n), dtype = numpy.float64)
    xi = int(n*n*xdensity)
    x.reshape(n*n)[0:xi] = numpy.random.random((xi,))
    y = numpy.zeros((n,1), dtype = numpy.float64)
    yi = int(n*ydensity)
    y.reshape(n)[0:yi] = numpy.random.random((yi,))
    x = eval('%s(x)' % xtype)
    y = eval('%s(y)' % ytype)
    t0 = time.clock()
    if xtype == 'numpy.array' and ytype == 'numpy.array':
        for i in range(1000):
            z = numpy.dot(x,y)
    else:
        for i in range(1000):
            z = x*y
    tf = time.clock() - t0
    text = ''
    text += (xtype + ' '*20)[0:20]
    text += (ytype + ' '*20)[0:20]
    text += '%4dx%4d   %4dx%4d   %.2f        %.2f        %.2f' % (n,n,n,1,xdensity, ydensity, tf)
    return text



xtypes = ['numpy.array',
          'numpy.matrix',
          'sparse.lil_matrix',
          'sparse.csr_matrix',
          'sparse.csc_matrix']
ytypes = ['numpy.array',
          'numpy.matrix',
          'sparse.lil_matrix',
          'sparse.csr_matrix',
          'sparse.csc_matrix']
xdensities = [0.01, 0.10, 0.25, 0.50, 1.00]
ydensities = [1.00]

print '=================== =================== =========== =========== =========== =========== ======='
print 'X type              Y type              X size      Y size      X density   Y density   Time   '
print '------------------- ------------------- ----------- ----------- ----------- ----------- -------'
n = 100
for xdensity in xdensities:
    for ydensity in ydensities:
        for xtype in xtypes:
            for ytype in ytypes:
                print benchmark(xtype, xdensity, ytype, ydensity, n)
        print '------------------- ------------------- ----------- ----------- ----------- ----------- -------'
n = 1000
for xdensity in xdensities:
    for ydensity in ydensities:
        for xtype in xtypes:
            for ytype in ytypes:
                print benchmark(xtype, xdensity, ytype, ydensity, n)
        print '------------------- ------------------- ----------- ----------- ----------- ----------- -------'
print '=================== =================== =========== =========== =========== =========== ======='