Gradient of a vector

I have 3 vectors X(i,j);Y(i,j) and Z(i,j).Z is a function of x and y numerically. I want to plot the gradient of z with respect to x and y. Can anyone suggest me how to find the gradient in the above case? Thanks, -Bhaskar

Answer 1

[Walter Roberson]

Is it a rectangular grid? [X, Y] = ndgrid(Xv, Yv) for some vector Xv, Yv ?

If so, then

gradient(Z, xv, yv)

[Bhaskarjyoti]

yeah it is a rectangular grid. And it works. Thanks a lot.

[Muthu Annamalai]

@walter I love the gradient + quiver plots. Reminds me of the swirling fields.. http://www.mathworks.com/help/matlab/ref/gradient.html?searchHighlight=gradient

Answer 2

[Image Analyst]

Wouldn't it be diff(Z) ./ sqrt(diff(X).^2 + diff(Y).^2) or something pretty similar to that?

[Bhaskarjyoti]

Thanks. I could do it by gradient(z,x,y).