how to improve this cycle (extracting data from structured array)?

Alexzive zasaconsulting at gmail.com
Thu Feb 11 12:44:55 CET 2010


Hello guys,

I am just wondering if there is a quick way to improve this algorithm
[N is a structured array which hold info about the nodes n of a finite
element mesh, and n is about 300.000). I need to extract info from N
and put it in to a 3*n matrix NN which I reshape then with numpy. I
think to "append" is quite unefficient:

***********************************************************
N = odb.rootAssembly.instances['PART-1-1'].nodes


NN=[]

B=[0,0,0]
 #auxsiliar vector
for i in range(len(N)):

    B[0] = N[i].label

    B[1] = N[i].coordinates[0]

    B[2] = N[i].coordinates[1]

    NN = append(NN,B)


NN=NN.reshape(-1,3)

****************************************************
Many Thanks in advance!
Alex



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