[Numpy-discussion] trying to speed up the following....
Brennan Williams
brennan.williams@visualreservoir....
Tue Mar 24 18:29:34 CDT 2009
I have an array (porvatt.yarray) of ni*nj*nk values.
I want to create two further arrays.
activeatt.yarray is of size ni*nj*nk and is a pointer array to an active
cell number. If a cell is inactive then its activeatt.yarray value will be 0
ijkatt.yarray is of size nactive, the number of active cells (which I
already know). ijkatt.yarray holds the ijk cell number for each active cell.
My code looks something like...
activeatt.yarray=zeros(ncells,dtype=int)
ijkatt.yarray=zeros(nactivecells,dtype=int)
iactive=-1
ni=currentgrid.ni
nj=currentgrid.nj
nk=currentgrid.nk
for ijk in range(0,ni*nj*nk):
if porvatt.yarray[ijk]>0:
iactive+=1
activeatt.yarray[ijk]=iactive
ijkatt.yarray[iactive]=ijk
I may often have a million+ cells.
So the code above is slow.
How can I speed it up?
TIA
Brennan
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