[Numpy-discussion] question on use of newaxis

Mark Bakker markbak@gmail....
Wed Feb 9 04:00:31 CST 2011


Hello List,

I have a simple array

a = array([1,2,3])

I want to take the last two terms and make it a column vector:

a[[1,2],newaxis]

But I get a funny error: TypeError: long() argument must be a string or a
number, not 'NoneType'

It does work if I do

a[[1,2]][:,newaxis]

But I don't understand why the first wouldn't work. Is there a reason such
syntax is not supported? It would be very useful.

Thanks,

Mark
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