Fabrizio,
As implemented, cquiver and vfcolor can only display a rectangular grid of vectors. Thus the quiver functionality you are looking for is not available. Sorry! I'll consider whether it can be added in a future version.

Christopher,
I guess it's confusing that the usage for cquiver is slightly different from quiver. Sorry about that!

If I understand your example properly, `of` represents the optical flow you wish to display as a 2D array of complex numbers. In that case you should be able to call cquiver like this:

Fabrizio,
As implemented, cquiver and vfcolor can only display a rectangular grid of vectors. Thus the quiver functionality you are looking for is not available. Sorry! I'll consider whether it can be added in a future version.

Dear Nicholas,
I have a problem with using cquiver and vfcolor. I have a map of vectors that I normally display with quiver by giving it as an imput the x and y position of each vector and the x and y components (say quiver(xcoord, ycoord, xcomp, comp)). Rather then the standard quiver plot, I wish to colorcode this map of vectors. What should I give as an input to vfcolor or cquiver?

The problem comes from the places where original code converts int's to pointers. In 32-bit machine this is okay, but with 64-bit, you need to use a 64-bit type instead of int. In this case, if you read the error in detail, it tells you that mwIndex (a 64-bit pointer of type unsigned long *) is being assigned to an int. If you go to that line you see ir = mxGetIr(prhs[0]); Find where ir is defined (line 127: int *ir, *jc;) and change its type to a unsigned long *. unsigned long *ir, *jc; And repeat a similar procedure for this kind of errors (occurs 5-6 times, including the ones in pixCon.cpp).
I did this and I was able to compile with large arrays, but my Matlab crashes when running the code. Good luck.

Fabrizio,
As implemented, cquiver and vfcolor can only display a rectangular grid of vectors. Thus the quiver functionality you are looking for is not available. Sorry! I'll consider whether it can be added in a future version.

Dear Nicholas,
I have a problem with using cquiver and vfcolor. I have a map of vectors that I normally display with quiver by giving it as an imput the x and y position of each vector and the x and y components (say quiver(xcoord, ycoord, xcomp, comp)). Rather then the standard quiver plot, I wish to colorcode this map of vectors. What should I give as an input to vfcolor or cquiver?

Christopher,
I guess it's confusing that the usage for cquiver is slightly different from quiver. Sorry about that!
If I understand your example properly, `of` represents the optical flow you wish to display as a 2D array of complex numbers. In that case you should be able to call cquiver like this:
cquiver(of);

can you give me an working example of the cquiver() function? i don't know how to handle the input arguments.
formally I used Matlabs quiver() function like this:
%read a single frame of a Video file
im = step(hVideoSrc);
%create a rectangular grid
[X Y] = meshgrid(1:1:size(im, 2), 1:1:size(im, 1));
% compute optical flow for the video
%Horizontal and vertical components in %complex form
of = step(hof,im);
%plot a 2-d vector Field
quiver(X(:),real(of(:)),Y(:),imag(of(:)));
This returns a Quiver Plot of the Optical flow between two frames of the Video.
But when I replace the quiver() function With the cquiver function it just returns me the Colorbar, and nothing else.

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