pythonnumpy

how to average in a specific dimension with numpy.mean?

I have a matrix called POS which has form (10,132) and I need to average those first 10 elements in such a way that my averaged matrix has the form of (1,132)

I have tried doing

means = pos.mean (axis = 1) or menas = np.mean(pos)

but the result in the first case is a matrix of (10,) and in the second it is a simple number

i expect the ouput a matrix of shape (1,132)

Solution

  • The solution is to specify the correct axis and use keepdims=True which is noted by several commenters.

    This can be done with either pos.mean(axis = 0,keepdims=True) or np.mean(pos,axis=0,keepdims=True)