quiver plot

Question

iceuday 2011-12-20

Hello,

I have a quiver plot,

hQ = quiver(x,y,unode',vnode',.4,'k-');

and i am trying to extract the data from this quiver plot by using this code,

a = get(hQ,'unode');
fid = fopen('test1.txt','w');
fprintf(fid,' %5.3f \n' ,unode)
status = fclose(fid);

But i get an error message every-time, the error message is,

??? There is no 'unode' property in the 'quivergroup' class.

Error in ==> test1 at 126 a = get(hQ,'unode');

Anybody could explain to me how to overcome this error i am getting.

Thank You.

Answer 1

Sean de Wolski 2011-12-20

'unode' is not a defined quiver group property, it's a vector of u-velocities that you're feeding into quiver. quiver properties are available here:

docsearch quivergroup properties

From that document it appears you want 'udata'

a = get(hQ,'udata');