Row vector (multiplication by a column vector)

02012023, 02:21 PM
Post: #1




Row vector (multiplication by a column vector)
Example: 3x1 column vector multiplying a 1x3 row vector
a:=[[1,2,3]]; b:=[4,5,6]; a*b => "dotvecteur Error: Invalid dimension" However, by converting b to a 1x3 matrix first, works. b:=TRN(TRN(b)); // Converts the 1x3 vector to a 1x3 matrix ... a*b => [[4,5,6],[8,10,12],[12,15,18]] Requiring conversion from a row vector to a 1x3 matrix data type is an extra step that could benefit from software improvement, in cases such as these. 

02012023, 09:56 PM
Post: #2




RE: Row vector (multiplication by a column vector)
When I took my first linear algebra course, I was taught that vectors are simply special cases of matrices (1×n or n×1, rather than m×n).


02022023, 11:16 AM
Post: #3




RE: Row vector (multiplication by a column vector)
On the other hand, if you handle this case without error, it will be harder to detect a real error...


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