[SciPy-user] strange ValueError in scipy_core
Chris Fonnesbeck
fonnesbeck at gmail.com
Thu Nov 10 15:29:07 EST 2005
I am converting some code over to scipy_core which involves populating
a relatively sparse matrix, so I am generating an array of zeros, and
substituting the non-zero elements. However, this substitution does
not seem to be allowed. Here is the relevant section of code.
# Initialize projection matrix
matrix = zeros((10,10),typecode='d')
# Populate with non-zero elements
matrix[0,4] = 0.5*s1
matrix[1,0] = s2
matrix[2,1] = s3
matrix[3,2] = s4*(1.-g4)
matrix[3,3] = sP*(1.-gP)
matrix[4,2] = s4*g4
matrix[4,3] = sP*gP
matrix[4,5] = sA*gB
matrix[5,4] = sA
matrix[5,5] = sA*(1.-gB)
matrix[6,4] = 0.5*s1
matrix[7,6] = s2
matrix[8,7] = s3
matrix[9,8] = s4
matrix[9,9] = sA
But I get the following:
--> 777 matrix[0,4] = 0.5*s1
matrix = [[ 0., 0., 0., 0., 0., 0., 0., 0., 0., 0.,]
[ 0., 0., 0., 0., 0., 0., 0., 0., 0., 0.,]
[ 0., 0., 0., 0., 0., 0., 0., 0., 0., 0.,]
[ 0., 0., 0., 0., 0., 0., 0., 0., 0., 0.,]
[ 0., 0., 0., 0., 0., 0., 0., 0., 0., 0.,]
[ 0., 0., 0., 0., 0., 0., 0., 0., 0., 0.,]
[ 0., 0., 0., 0., 0., 0., 0., 0., 0., 0.,]
[ 0., 0., 0., 0., 0., 0., 0., 0., 0., 0.,]
[ 0., 0., 0., 0., 0., 0., 0., 0., 0., 0.,]
[ 0., 0., 0., 0., 0., 0., 0., 0., 0., 0.,]]
s1 = 0.78583498304255861
778 matrix[1,0] = s2
779 matrix[2,1] = s3
ValueError: cannot handle misaligned or not writeable arrays.
--
Chris Fonnesbeck
Atlanta, GA
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