MATLAB: How to plot vector field

MATLABquivervector fieldvectorizationvectors

Hello Everybody I have 4 vectors x,z,dx,dz which respectively are coordinate of x,coordinate of z, displacement in x direction ,displacement in z direction. I want to plot a vector field graph for displacement, to see the amount and direction of displacement on each point.size of each vector is (110000,1).

What I could think of was

[X,Z]=meshgrid(x(:,1),z(:,1));

D=sqrt(dx.^2+dz.^2);

quiver(X,Z,D,dx)

But didn’t work at all. Any help would be highly appreciated as I am still new to matlab. Thank you in advance

#x,z are evenly spaced, I mean with different intervals.

Best Answer

quiver(x,z,dx,dz)

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fimplicit3(@(x,y,z) x.^2 +4*y.^2 +9*z.^2 - 1)

MATLAB: How to use quiver with equations in function

Replace

   [dx,dy]=odehandle; %does not work!

with

   temp = arrayfun(@(X, Y) odehandle([],[X,Y]), x, y, 'uniform', 0);
   dx = cellfun(@(C) C(1), temp);
   dy = cellfun(@(C) C(2), temp);

This is for the special case that the ODE is a function of two variables and the first derivatives apear as the first two elements of the output vector.

The 3D equivalent would be something like,

function plot_vectorfield(odehandle)
   [x, y, z]=meshgrid(-10:1:10, -10:1:10, -10:1:10);
   temp = arrayfun(@(X, Y, Z) odehandle([],[X,Y,Z]), x, y, z, 'uniform', 0);
   dx = cellfun(@(C) C(1), temp);
   dy = cellfun(@(C) C(2), temp);
   dz = cellfun(@(C) C(3), temp);
   quiver3(x, y, z, dx, dy, dz);
end

Best Answer

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