4. Tensors & Manipulation

1. Reshaping Reality

Changing the dimensions without copying data.

python
a = np.arange(9)
m = a.reshape(3, 3) # Becomes a matrix

Forget if statements inside loops. Use Masks.

python
data = np.array([10, 20, 30, 40])
mask = data > 25
print(mask)       # [False, False, True, True]
print(data[mask]) # [30, 40]