How to make a code continue running if while loop returns NaN

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Adeyemi Adepegba
Adeyemi Adepegba 2011-7-11
I have the following code below
R =5; % LQR Weighting
Q = [100 0 0 0; 0 5 0 0; 0 0 10 0; 0 0 0 1];
K = dlqr(Adhat,Bdhat,Q, R);
R1a = tf(ss(Adhat,Bdhat,K,0));
T1a = minreal(minreal(R1a)/(1 + minreal(R1a))); % Closed Loop Transfer Function
figure(1)
step(T1a)
S = stepinfo(T1a,'SettlingTimeThreshold',0.01); %Settling time threshold specification for 1%
x = S.SettlingTime;
while x > 0.1
R=R/2;
Q = Q*2;
K = dlqr(Adhat,Bdhat,Q, R);
R1a = tf(ss(Adhat,Bdhat,K,0));
T1a = minreal(minreal(R1a)/(1 + minreal(R1a)));
figure(1)
step(T1a)
hold on
x1 = 0:0.1:20; y1 = 1.01*ones(size(x1)); line(x1,y1) % Line to indicate +1%
x2 = 0:0.1:20; y2 = 0.99*ones(size(x2)); line(x2,y2) % Line to indicate -1%
hold off
S = stepinfo(T1a,'SettlingTimeThreshold',0.01); %Settling time threshol specification for 1%
x = S.SettlingTime;
end
figure(2)
nyquist(R1a)
title('Nyquist diagram of return ratio, K ')
hold on
circ = -1 +exp(j*[0:pi/1000:2*pi]');
plot(circ,'r')
hold off
disp('See Fig 2')
disp(['Settling Time= ' num2str(x)])
disp(['R= ' num2str(R)])
disp(['K= ' num2str(K)])
I need the code to continue running even if the while loop returns a NaN value, I cant seem to get this to work. I have tried using if else loop and it returns the same result.
I will apprciate any tips to get this issue resolved.
Thanks
  1 个评论
Jan
Jan 2011-7-11
Please format your code properly. See the "Markup" link on this page for explanations.
It would be easier to answer, if you omit all lines, which do not concern your problem. A WHILE loop does not return anything, so please explain, where the NaN appears. Do you mean, that x gets the value NaN?

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采纳的回答

Jan
Jan 2011-7-11
I have only a faint idea of what your problem might be. Perhaps this helps:
while (x > 0.1) || isnan(x)

更多回答（1 个）

Sean de Wolski
Sean de Wolski 2011-7-11
while something || isnan(something_else)
%etc.
end

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