Hi Claus,
On the basis of early code provided, I think you just need to transpose the
matrix inputs to param3d1 in order to have the parametric curves plotted at
fixed angles along <> frequencies. See below:
// START OF CODE
frequencies = [201 811 3183 12862 25113]; // Hz; row vector
angles = [0 30 60 90]; // off-axis angles, degrees
m_norm = [ 1.0 0.9945629 0.9643959 0.8756431;
1.0 0.9914442 1.0244046 0.9414654;
1.0 0.9910279 0.9670986 0.8932413;
1.0 0.9339808 0.8378147 0.7067978;
1.0 0.8985782 0.7536068 0.5074218];
[nf na] = size(m_norm)
A = (angles .*. ones(nf,1))';
F = (frequencies .*. ones(na,1));
M = 20*log10(m_norm'); // dB scale
clf();
sp = gca(); // Get current axis handle
param3d1(F',A',M',alpha=50,theta=-110,flag=[2,4]);
e = gce() //the handle on the 3D polyline
e.children.foreground = color('dark blue');
e.children.thickness = 2;
xgrid;
sp.log_flags = "lnn"; // x-axis log scale (frequencies)
sp.cube_scaling = "on";
xlabel("Frequency (Hz)");
ylabel("Angle (deg)");
zlabel("Mag (dB)");
// END OF CODE
Regards,
Rafael
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