strange quiver3 plot

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Gabriel Silva 2022-8-15

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https://ww2.mathworks.cn/matlabcentral/answers/1779885-strange-quiver3-plot

编辑： Gabriel Silva 2022-10-21

Hello there!

I'm having throuble with a quiver plot. There's this M vector field I want to display over this curved ribbon callend by plotaFita( ) in the code bellow. All vectors should look the same size but it looks a lot bigger in the curve maximum. Any ideias? It's funny because when I put the zero in quiver scale I do got a field with constant norm, but it's completly different, with the arrows all over the origin of the plot.

  Omega = @(theta) 2*atan( exp( (theta-theta0)/delta ) );
  Mr = @(theta) Ms*sin(fi).*sin(Omega(theta));
  Mtheta = @(theta) Ms*cos(Omega(theta));
  Mz = @(theta) Ms*cos(fi).*sin(Omega(theta));
  Mx = @(theta) Mr(theta).*cos(theta) - Mtheta(theta).*sin(theta) ;
  My = @(theta) Mr(theta).*sin(theta) + Mtheta(theta).*cos(theta) ;
  XYZ = plotaFita(dr,dz,Raio,Nx,Nz); hold on;
  [n,m] = size(XYZ);
  X = XYZ(:,1:(m/3)); Y = XYZ(:,(m/3 + 1):(2*m/3)); Z = XYZ(:,(2*m/3+1):end);
  Theta = atan(Y./X);
  quiver3(X,Y,Z,Mx(Theta),My(Theta),Mz(Theta));
  %quiver3(X,Y,Z,Mx(Theta),My(Theta),Mz(Theta),0);  