Unable to plot Graph in matlab

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Avinash
Avinash 2013-4-2
Hi, I'm new to matlab. Below is the code i used to get Te,Tg, TgErr,TeErr and No of iterations. As NOI increases from 1-200 a new Te value will be generated in each iteration.I want to plot NOI vs Te, NOI vs Tg, NOI vs TeErr, NOI vs TgErr. I used plot(NOI,Te)-----but it didn't work.Please let me know the command to plot the graph.
load y
% initial conditions
pold=eye(5,5)*30;
aold=[1 -1 0 0 0]';
alpha=aold';
lambda=0.9;
t=y(1,:); Ts=t(2)-t(1); % sampling time
u=y(2,:); z=y(3,:);
MAX=size(z,2);
NOI=0; %no of iterations
for k=5:MAX-5
sold=[z(k-1) z(k-2) u(k) u(k-1) u(k-2)]';
knew=pold*sold*inv(sold'*pold*sold+lambda);
pnew=(pold-pold*sold*inv(sold'*pold*sold+1)*sold'*pold)/lambda;
anew=aold+knew*(z(k)- sold'*aold);
pold=pnew;
aold=anew;
alpha=[alpha;anew'];
%%%%calculation of time constants %%%%
Tg=-Ts/log([anew(1)+sqrt(anew(1)^2+4*anew(2))]/2);
Te=-Ts/log([anew(1)-sqrt(anew(1)^2+4*anew(2))]/2);
T =[Tg ;Te]'
%caluculating etimation erro%
TgErr=((3-Tg)/3)*100;
TeErr=((0.2-Te)/0.2)*100;
Er=[TgErr; TeErr]
NOI=NOI+1
end
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Image Analyst
Image Analyst 2013-4-2
That's because NOI and Te are not arrays - I think they're just single numbers - so you won't see a curve.
Avinash
Avinash 2013-4-2
Ok..... I don't know how to code arrays in matlab.I will now try writing arrays. Thank you very much Image Analyst.

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回答（1 个）

Image Analyst
Image Analyst 2013-4-2
Give typical values for y if you want us to try the code. If I try with rand(3,10) for y it says NOI is 1 and TE is complex.
Also if you plot Te vs. NOI, you need to make sure that they are arrays, and they are plotted after the loop (for efficiency). Like inside the loop:
Te(k) = -Ts/log([anew(1)-sqrt(anew(1)^2+4*anew(2))]/2);
Then after the loop
NOI = 1 : length(Te);
plot(NOI, Te, 'bo-', 'LineWidth', 3);
grid on;
title('Te vs. NOI', 'FontSize', 30);
xlabel('NOI', , 'FontSize', 30);
ylabel('Te', , 'FontSize', 30);
  7 个评论
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Walter Roberson
Walter Roberson 2013-4-2
Simulink is included with the Student Version license, but not with any of the other licenses. Image Analyst does not have a Student Version license. (I don't either.)
Avinash
Avinash 2013-4-2
Ok.....Thanks for your time. I figured it out

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