Doubt about shape of matrix 'b'

Course Q&A Math for Machine Learning Linear Algebra for Machine Learning and Data Sc...
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  1. Why the shape of the matrix ‘b’ is shown as (3, ) when actually it is a 3x1 matrix?
  2. Why do we have to use b.reshape(3, 1) when it is already a 3x1 matrix?
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Hi @Patil_Aditi_Rajendra

When b is shown as (3,) it is a 1D array without knowing whether it is a row vector or a column vector. The reshape function helps to specify b to be a 2-D array representing a column vector.

Here is a thread about 1D vs 2D arrays