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' )
采纳的回答
Cris LaPierre
2022-7-26
编辑：Cris LaPierre
2022-7-26
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 个评论
Bumze
2022-7-26
Cris LaPierre
2022-7-26
编辑：Cris LaPierre
2022-7-26
I mocked up your app using the info you provided. Works for me. Can you confirm that your axes are, in fact, named UIAxes4?
My app does not use a for loop, but did create rangevar using one of the approaches in my answer (same result using either approach).
Bumze
2022-7-27
Cris LaPierre
2022-7-27
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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