Matlab to Python : why we are getting the error

Question

It works in MATLAB / OCTAVE – how can I rightly fix it in Python:

octave:40> whos YDFA_ale_ase
Variables in the current scope:

   Attr Name              Size                     Bytes  Class
   ==== ====              ====                     =====  ===== 
        YDFA_ale_ase     51x1                        408  double

Total is 51 elements using 408 bytes

octave:41> whos N1
Variables in the current scope:

   Attr Name        Size                     Bytes  Class
   ==== ====        ====                     =====  ===== 
        N1          1x1200                    9600  double

Total is 1200 elements using 9600 bytes

octave:45> YDFA_ale_ase * N1
ans =

 Columns 1 through 20:

   46.8270   46.8270   46.8270 
..........................

But in Python I get the below error:

np.dot(YDFA_ale_ase, 1.-N1)-np.dot(YDFA_ala_ase, N1)

ValueError: matrices are not aligned

Other attempt:

YDFA_ale_ase* 1.-N1-YDFA_ala_ase* N1

ValueError: operands could not be broadcast together with shapes (51) (1,1200)

However :

print YDFA_ale_ase.shape, N1.shape

Gives me

(51,) (1, 1200)

Asked By: Programmer

||

Source

Answer 1

Print the shape of your arrays. Keep in mind that Matlab matrices have at least 2 dims, while NUMPY can be 1 or even 0. Most likely you are trying to dot a (n,) with a (1,m). Add a dimension on thr right of your ( n,) array. Y[:, None] is the easiest way.

Link

Answered By: hpaulj

Matlab to Python : why we are getting the error

Question:

Answers: