MATLAB: Vector multiplication for a vector with a transpose of vector i.e. one row vector and one column vector.

Question

I am using this script to multiply two vectors as below:

%Parameters Declaration

S0T=[1,2,3,-1,-2]

S1T=[1,1,-2,2,-3]

S0=transpose(S0T)

S1=transpose(S1T)

S1=S0T*S0

S2=S0T*S1

S3=S1T*S0

S4=S1T*S1

But unfortunately I am not able to match the output with theoretical results as below:

Output:

S0T =

1 2 3 -1 -2

S1T =

1 1 -2 2 -3

S0 =

1

2

3

-1

-2

S1 =

1

1

-2

2

-3

S1 =

19

S2 =

19 38 57 -19 -38

S3 =

1

S4 =

19 19 -38 38 -57

>>

Theoretical Results:

S1=19 (This is correct)

S2=1 (This is Wrong as per Matlab results)

S3=1 (This is correct)

S4=19 (This is Wrong as per Matlab results)

Question: I want to know if there is a better commend/operator in MATLAB that can be used to multiply two vectors i.e. one row vector and one column vector.

Answer 1

It's because you redefined S1 in line 6. Use distinct variable names for your outputs:

S0T=[1,2,3,-1,-2]
S1T=[1,1,-2,2,-3]
S0=transpose(S0T)
S1=transpose(S1T)
A=S0T*S0
B=S0T*S1
C=S1T*S0
D=S1T*S1

A =
    19
B =
     1
C =
     1
D =
    19