Numpy

Arrays

Initializing an empty array

Sometimes you want to initalize an empty array, which is a really inefficient use of memory for large matrices but you could care less if it's a dozen items.

In [62]: x=[]

In [63]: x=np.array(x)

In [64]: x
Out[64]: array([], dtype=float64)

In [66]: x = np.array([],dtype=np.float64)

In [67]: x
Out[67]: array([], dtype=float64)