Error message: AttributeError: module 'numpy' has no attribute 'flip'
I can't understand why it's giving me this error, I've googled and made sure I'm up to the latest version of numpy. I definitely don't have another file called numpy in my working directory. Any help would be greatly appreciated!
Yes,flip is new, but there isn't anything magical about it. Here's the code:
def flip(m, axis):
if not hasattr(m, 'ndim'):
m = asarray(m)
indexer = [slice(None)] * m.ndim
try:
indexer[axis] = slice(None, None, -1)
except IndexError:
raise ValueError("axis=%i is invalid for the %i-dimensional input array"
% (axis, m.ndim))
return m[tuple(indexer)]
The essence of the action is that it indexes your array with one or more instances of ::-1 (the slice(None,None,-1)). flipud/lr do the same thing.
With this x, flip does:
In [826]: np.array([1,2,3])[::-1]
Out[826]: array([3, 2, 1])
One can reshape 1-D array apply fliplr and then get 1-D array back. That is possible to go from 1-D x to 2-D by using, e.g. x.reshape(1,x.size) or [x].
x = np.arange(5)
print(x)
x = np.fliplr([x])[0]; # fliplr works with at least 2-D arrays
print(x)
[0 1 2 3 4]
[4 3 2 1 0]
