Making polar plots in dB with the most negative value in the center !

How to obtain the function: "polar_db" ? (Matlab 2021a does not know it !).

Please advice,

Regards Ole

Answer 1

[Star Strider]

Alternatively, you can subtract the most negative dB value from the rest, then scale the radius grid lines --

Perhaps something like this --

a = 0:0.01:2*pi;
r = 1 + sin(a);
r = mag2db(abs(r));
[rmin,rmax] = bounds(r)

rmin = -110.8921

rmax = 6.0206

rs = r - rmin;

figure
polarplot(a, rs)
Ax = gca;
rtix = Ax.RTick;
rtixs = rescale(rtix, rmin, rmax);
Ax.RTickLabel = compose('%.1f dB',rtixs);

●

% get(Ax)

.

[Ole]

Thanks a lot, it woks out fine.

Best regards

Ole (user in Denmark)

[Star Strider]

My pleasure!

If my Answer helped you solve your problem, please Accept it!

.

Answer 2

[dpb]

<It's a FEX submission>, not Mathworks-supplied in MATLAB

There's second there with the title "Polar_db" as well although I didn't go compare to see what might be the difference between the two...