Variables Calculated in Function Somehow Aren't Assigned to Output

2 visualizaciones (últimos 30 días)
My code was working only a day ago, but it just stopped giving me output. I know it calculates the variables I need (wg,pm) becasue it will display them, but it never leaves the scope of the for loop. I know its gotta be something simple, but I'm stumped.
function[wp,pm,wg,gm] = pleaseWork(tf_in)
tf = inline(tf_in,'r')
figure
j = 1
for w = 0:0.1:100
magDB = 20*log10(abs(tf(i*w)));
phase = mod((180/pi)*atan2(imag(tf(i*w)),real(tf(i*w))),-360);
if round(magDB) == 0
wg = w
pm = phase + 180
end
if round(phase) == -180
wp = w
gm = -magDB
end
hold on
subplot(2,1,1)
title('HW 2 #9')
ylabel('Magnitude (dB)')
semilogx(w,20*log10(abs(tf(i*w))),'b.')
hold on
subplot(2,1,2)
ylabel('Phase (deg)')
xlabel('Angular Frequency (rad/s)')
semilogx(w,phase,'b.')
j = j + 1;
end
end
  2 comentarios
Torsten
Torsten el 21 de Jul. de 2021
Before entering the for-loop, assign values to wg,pm,wp,gm (e.g. NaN).
What's the relevance of the variable j ?
Dominic Troche
Dominic Troche el 21 de Jul. de 2021
Editada: Dominic Troche el 21 de Jul. de 2021
Yeah that was it, I had no idea MATLAB wouldnt output if all outputs weren't assigned. j was accidentally copy and pasted over to this post, I truncated a lot of the code for readability.

Iniciar sesión para comentar.

Respuesta aceptada

Jonas
Jonas el 21 de Jul. de 2021
Editada: Jonas el 21 de Jul. de 2021
looks like your two if statements are never fullfilled, thats why output variables are empty
  2 comentarios
Dominic Troche
Dominic Troche el 21 de Jul. de 2021
Editada: Dominic Troche el 21 de Jul. de 2021
They're fufilled, as I can get it to display what I need while the function is executing. I just cant get it to output that value.
For example with a transfer function '50/(r*(r+1))'
Dominic Troche
Dominic Troche el 21 de Jul. de 2021
Actually, you're 100% correct. I didnt know MATLAB would assign any outputs if ALL o them werent assigned at some point.

Iniciar sesión para comentar.

Más respuestas (0)

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by