matrix vector multiplication complex number

Hi,

A complex matrix - vector mutiplication yields to a wrong result.

Heer is the code :

M = [ 1 complex(1,1) ; complex(0,-1) 1 ; 2 0; -1 3]
b = [ 2 complex(1,-1)]';
 
y=M*b

The outcome obtaind manually is : [ 4 1-3*i 4 1-3*i]

The matlab result (which is wrong) : [ 2+2*i 1-1*i 4 1+3*i]

May I ask you some hints please ?

Regards

Sylvain

Answer 1

[Torsten]

b = [ 2 ,complex(1,-1)].'

instead of

b = [ 2 ,complex(1,-1)]'

[Sylvain Rousseau]

Many Thanks Torsten, it works fine.

Though, I don't understand why it does work.

Cheers

[Torsten]

b = [ 2 ,complex(1,-1)].'

means that you take the transpose of the vector which gives

b = [2; complex(1,-1)]

b = [ 2 ,complex(1,-1)]'

means that you take the conjugate transpose of the vector which gives

b = [2; complex(1,1)]

[Sylvain Rousseau]

Many thanks Torsten.

Here is the corresponding doc link : https://fr.mathworks.com/help/matlab/ref/ctranspose.html