Gradient of a 2D plot
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Prince Alex
on 30 Sep 2020
Commented: Star Strider
on 30 Sep 2020
I have a 2D plot of potential (V) (circular contour plot). I have to find the electric field (E) by taking the gradient. How is it possible to see the gradient of V. [U,W]=gradient(V) returns the gradient in X and Y direction and quiver(X,Y,U,W) helps to visualize the vector field. How is it possible to view effective gradient. Contour (X,Y,U) will only help me to see gradient in x direction. How can I see the effect of gradient which is a vector sum of both gradient in X and Y.?
2 Comments
Ameer Hamza
on 30 Sep 2020
What is wrong with quiver. It generates arrows in the gradient direction.
Accepted Answer
Star Strider
on 30 Sep 2020
See the gradient documentation section on Contour Plot of Vector Field . It demonstrates exactly what you are describing.
4 Comments
Star Strider
on 30 Sep 2020
My pleasure!
It should not be showing any error. It is an example from the documentation (that I linked to in my oridginal Answer), and ran for me without error in R2020b. The ‘px’ and ‘py’ matrices are both (21x21), so the addition should work. If it is not working with your code, please post it.
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