Quiver - magnitude-dependent color in 2D and 3D

Implements the MATLAB given quiver/quiver3 function adding a color coding depending on magnitude

%quiverC3D creates a 3D quiver plot and adds a color coding. The color coding is

%given by the magnitudes of the component vectors. Large values result in colors

%from the upper end of the used colormap.

%

% INPUT:

% x - array, x components of initial points

% y - array, y components of initial points

% z - array, z components of initial points

% u - array, x components of arrows

% v - array, y components of arrows

% w - array, z components of arrows

% scale - number, if > 0, automatic scaling is used to avoid overlap

% of adjacent arrows. If scale = 0, the scaling is disabled.

% MaxNumArrows - a positive integer (non-integer should work as well)

% number limiting the maximum number of plotted arrows. Since vectors

% of length zero aren't plotted and the matrices are sampled

% uniformly, it's possible that fewer arrows will be visible in the

% end. If MaxNumArrows is not given its value is set to inf.

%

% OUTPUT:

% none

%

% WARNING!: This function might not create arrows with the same length as

% would be obtained using quiver3(x, y, z, u, v, w). I do not know

% whether the scaling method is the same is in quiver3.

%

%

% --------------------------------------------------------------------------------------

%

% EXAMPLE:

% load wind

% quiverC3D(x,y,z,u,v,w,1,1000);

% view(-45,20)

% set(gca, 'Color', 'black');

% axis tight

% axis equal

%

% --------------------------------------------------------------------------------------

%

% See also: QUIVER3, LINESPEC, COLORMAP.

%