Plotting log functions in App designer
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Hi there,
I am trying to create a radar app from scratch using functions that are tested okay in Matlab, when i run the codes in appdesigner, the graph does not show. Kindly help. Thanks.
Codes are :
tsc = app.TscansEditField.Value;
Tsc = 10*log10(tsc); % convert Tsc into log equiv
sigma_a = app.AircraftRCSdBsmEditField.Value;
sigma_m = app.MissileRCSdBsmEditField.Value;
% four_pi = 10*log10(4.0 * pi); % (4pi) in dB
k_db = 10*log10(1.38e-23); % Boltzman's constant in dB equiv.
te = app.EffectiveTemperatureKEditField.Value;
Te = 10*log10(te); % noise temp. in dB
% range_a = app.RangeaKmEditField.Value;
% range_adb = 10*log10(range_a* 1000.); % target range^4 in dB
% range_m = app.RangemKmEditField.Value;
% range_mdb = 10*log10(range_m* 1000.); % target range^4 in dB
az_anglea = app.AzimuthangledegEditField.Value;
el_anglea = app.ElevationangledegEditField.Value;
rloss = app.RadarLossdBEditField.Value;
snr = app.SNRdBEditField.Value;
nf = app.NoiseFiguredBEditField.Value;
factor = 10*log10(4*pi);
% Compute Omega in steradians
omega = (az_anglea / 57.296) * (el_anglea /57.296);
omega_db = 10.0*log10(omega); % Convert Omega to dBs
% Plot Power aperture product for missile and aircraft
rangevar = linspace (2,90,1);
rangedb = 10*log10(rangevar);
papm = snr - sigma_m - Tsc + factor + 4.0 .* rangedb + k_db + Te + nf + rloss + omega_db;
papa = snr - sigma_a - Tsc + factor + 4.0 .* rangedb + k_db + Te + nf + rloss + omega_db;
plot(app.UIAxes4,rangevar,papm,"g")
hold (app.UIAxes4, 'on' )
plot(app.UIAxes4,rangevar,papa, "r")
hold (app.UIAxes4, 'off' )
2 Comments
Accepted Answer
Cris LaPierre
on 26 Jul 2022
Edited: Cris LaPierre
on 26 Jul 2022
It looks like you tried to replace the for loop with an elementwise multiplication. However, your syntax for rangevar is only returning a single value. Therefore, the resulting calculation is a single value. Because the plot function does not include a marker style by default, when you plat a single point, it is not visible.
With linspace, you need to specify the number of points you want as the 3rd input. If you instead want to define the increment, stick with the colon operator.
rangevar = 2:90;
% or
rangevar = linspace(2,90,89);
5 Comments
Cris LaPierre
on 27 Jul 2022
Glad to hear. I did have to build the entire app, but the only thing I changed in the code you shared was rangevar.
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