division of two vectors
124 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
mimalo salina
am 9 Okt. 2017
Beantwortet: mimalo salina
am 9 Okt. 2017
What is the result of A/B ???? (if A and B are same 3x1 row vectors) Example:
A=[-1;1;7]
B=[5;7;-2]
A/B
in Matlab gives: ans =
0 -0.1429 0
0 0.1429 0
0 1.0000 0
5 Kommentare
Guillaume
am 9 Okt. 2017
Bearbeitet: Guillaume
am 9 Okt. 2017
"we can't divide two vectors". Well, obviously you can apply the / operators to two vectors since matlab give you a result.
As Adam said in his comment and as Jan showed in its answer, what it does is fully documented. It solves a system of linear equation. If the right-hand side is not a square matrix as is the case here, it is solved using least-square method. As documented:
If A is a rectangular m-by-n matrix with m ~= n, and B is a matrix with n columns, then x = B/A returns a least-squares solution of the system of equations x*A = B
I'm not sure what other answer you are looking for.
Akzeptierte Antwort
Jan
am 9 Okt. 2017
C = A / B determines the matrix C such that:
C * B = A
Try it:
A = [-1;1;7];
B = [5;7;-2];
C = A / B;
C * B
>> [-1; 1; 7]
0 Kommentare
Weitere Antworten (2)
John D'Errico
am 9 Okt. 2017
A=[-1;1;7];
B=[5;7;-2];
First of all, A and B are NOT row vectors. They are column vectors. Thus, A is a vector in column orientation.
A
A =
-1
1
7
Next, what is C=A/B?
C = A/B
C =
0 -0.142857142857143 0
0 0.142857142857143 0
0 1 0
It is a matrix, such that if possible, we will have A=C*B.
C*B
ans =
-1
1
7
In some cases of vectors or matrices of varying sizes, that will not be possible.
0 Kommentare
Siehe auch
Kategorien
Mehr zu Logical finden Sie in Help Center und File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!