John, I just added the following to your example: ................................... tnow = time.time() y = numpy.fromiter((tuple(i) for i in x), dtype=[('a',numpy.float_), ('b', numpy.float_)]) tdone = time.time() print 'Numpy.fromiter %1.2f elapsed seconds'%(tdone - tnow) ................................... Here are my results with dtype: 4.43 elapsed seconds w/o dtype 5.78 elapsed seconds Numeric 1.17 elapsed seconds Numpy.fromiter 0.62 elapsed seconds 23.7 1.0
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