indexing arrays

[John [H2O]]

I'm having trouble slicing arrays:

I thought I could do the following:

i = array(range(140,149))
j = array(range(5,20))
a = acc[i,j]

Traceback (most recent call last):
File "<string>", line 1, in <string>
ValueError: shape mismatch: objects cannot be broadcast to a single shape

It's strange, because I can do this:

a = acc[140:148,5:19]

Anyone know what I am doing wrong?

 

[Emily Rodgers]

I'm having trouble slicing arrays:

I thought I could do the following:

i = array(range(140,149))
j = array(range(5,20))
a = acc[i,j]

Traceback (most recent call last):
File "<string>", line 1, in <string>
ValueError: shape mismatch: objects cannot be broadcast to a single shape

It's strange, because I can do this:

a = acc[140:148,5:19]

Anyone know what I am doing wrong?

What data structure is acc, and what are you trying to do?

 

[Jeremy Sanders]

Anyone know what I am doing wrong?

The arrays in the numpy package are more sophisticated than the built-in
array package. This sort of thing works there:

import numpy
a = numpy.array([1,2,3,4,5,6,7,8])*2
a array([ 2, 4, 6, 8, 10, 12, 14, 16])
a[range(3,6)]

array([ 8, 10, 12])

Jeremy