Problem with plotting vector fields

2 Ansichten (letzte 30 Tage)
Randy Chen
Randy Chen am 13 Okt. 2020
Kommentiert: Randy Chen am 14 Okt. 2020
I keep getting this error while trying to plot a vector field:
[X,Y] = meshgrid(2:10,2:10);
U = X/(X^2+Y^2);
V = Y/(X^2+Y^2);
quiver(X,Y,U,V,0)
Warning: Matrix is singular to working precision.
Warning: Matrix is singular to working precision.
I don't understand. What does this mean??
  1 Kommentar
Randy Chen
Randy Chen am 13 Okt. 2020
also the figure I get comes out to be emtpy

Melden Sie sich an, um zu kommentieren.

Akzeptierte Antwort

Stephen23
Stephen23 am 13 Okt. 2020
Bearbeitet: Stephen23 am 13 Okt. 2020
"also the figure I get comes out to be emtpy"
You need to use array operations, not matrix operations:
>> [X,Y] = meshgrid(2:10,2:10);
>> U = X./(X.^2+Y.^2); % note array operations ./ and .^
>> V = Y./(X.^2+Y.^2); % note array operations ./ and .^
>> quiver(X,Y,U,V,0)
Tip: if you are not doing linear algebra then most likely you should be using array operations:
"I don't understand. What does this mean??"
The matrix operation mrdivide you used by mistake is trying to solve an unsolvable set of equations. The fact that it solves sets of equations is explained in its documentation, which is why you should read the documentation for every operator that you use, no matter how trivial you think it is.
  3 Kommentare
Stephen23
Stephen23 am 13 Okt. 2020
@Randy Chen : please remember to accept my answer!
Randy Chen
Randy Chen am 14 Okt. 2020
just did!

Melden Sie sich an, um zu kommentieren.

Weitere Antworten (0)

Kategorien

Mehr zu Vector Fields 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!

Translated by