[Numpy-discussion] Initialize numpy array with other numpy arrays
Frank Peacock
frank@gis4weather....
Thu Feb 19 17:03:58 CST 2009
Hello
I would like to know whether I can do the following in some other way as
this fails with setting an array with a sequence on each of the colour
arrays:
h,w=720,410
img = ones((h,w,3), uint8)*255
img[ngridn,ngride]=(ncolour[0],ncolour[1],ncolour[2])
pilImage = Image.fromarray(img, 'RGB')
where ngridn,ngride,ncolour[m] are all 1-D with the same dimension
(effectively ngridn and ngride values map within the bounds of the image)
The following works fine:
h,w=720,410
img = ones((h,w,3), uint8)*255
img[ngridn,ngride]=(255,0,0)
pilImage = Image.fromarray(img, 'RGB')
I would prefer not to use indices to solve the problem like the following:
(as it is a lot slower)
h,w=720,410
img = ones((h,w,3), uint8)*255
for n in range(len(gride)):
img[ngridn[n],ngride[n]]=(ncolour[0][n],ncolour[1][n],ncolour[n][2])
pilImage = Image.fromarray(img, 'RGB')
It is possible to not use indices and use numpy functions instead.
Thanks
Frank
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