Usage of vellipse

[Adriano]

Hi, i hope you are enjoying your Christmas holidays. I'm trying to plot 3D velocity ellipsoids for a SCARA robot manipulator. When i call SCARA.vellipse(q_val,'fillcolor','b','edgecolor','w') where q_val is a vector of my joints variables, it appears a list of errors. Could you please tell me more about?

Thanks,

Adriano

Error using matlab.graphics.chart.primitive.Surface/set
Error setting property 'Tag' of class 'Surface':
Value must be a character vector or string scalar.

Error in mesh (line 148)
    set(hh,prop{:})

Error in plot_ellipse (line 131)
            h = mesh(Xe, Ye, Ze, 'FaceColor', opt.fillcolor, ...

Error in SerialLink/vellipse (line 97)
                h = plot_ellipse(N, t(1:3), 'edgecolor', 'k', 'fillcolor', 'r', 'alpha', 0.5, 'Tag', name, args{:});

Error in cinematica (line 69) (this is actually the only reference to a line code written by me)
SCARA.vellipse(q_val,'fillcolor','b','edgecolor','w')