Change color of vectors in quiver

[Andres Sepulveda]

 Hi,

  I would like to change the color of the vectors plotted with quiver.

This works

octave:10> [x, y] = meshgrid (1:2:20);
octave:11> quiver (x, y, sin (2*pi*x/10), sin (2*pi*y/10));

and I can even increase the vector size

octave:12> quiver (x, y, sin (2*pi*x/10), sin (2*pi*y/10),2);

but not the color

octave:13> quiver (x, y, sin (2*pi*x/10), sin (2*pi*y/10),2,'k');
error: set: invalid value for radio property "linestyle"
error: called from:
error:   /usr/local/share/octave/3.3.52/m/plot/private/__line__.m at
line 65, column 5
error:   /usr/local/share/octave/3.3.52/m/plot/line.m at line 38, column 5
error:   /usr/local/share/octave/3.3.52/m/plot/private/__plt__.m at
line 583, column 12
error:   /usr/local/share/octave/3.3.52/m/plot/private/__plt__.m at
line 196, column 14
error:   /usr/local/share/octave/3.3.52/m/plot/private/__plt__.m at
line 79, column 17
error:   /usr/local/share/octave/3.3.52/m/plot/plot.m at line 193, column 9
error:   /usr/local/share/octave/3.3.52/m/plot/private/__quiver__.m at
line 185, column 12
error:   /usr/local/share/octave/3.3.52/m/plot/quiver.m at line 72, column 11

Is it possible?

Regards,

-- 
Andres Sepulveda
Departamento de Geofisica
Universidad de Concepcion