12.11) More Dimensions

For arrays with more dimensions, it can be tricky to keep track of the order of dimensions, so let’s see an example:

>>> B=np.ones((2,3,4)) # 2x3x4 array
>>> print B
[[[ 1.  1.  1.  1.]
  [ 1.  1.  1.  1.]
  [ 1.  1.  1.  1.]]
 [[ 1.  1.  1.  1.]
  [ 1.  1.  1.  1.]
  [ 1.  1.  1.  1.]]]

So here we have 4 columns, 3 rows and two paragraphs if you like, so the order is something like B(paragraph,row,column). The rule is that the columns are always last.

How will the array B look like after these assignments? The result is on the next page.

>>> B[1,2,3]=99.9
>>> B[1,0,1]=55.5
>>> B[0,:,3]=44.4