how to call a matrix(1*43) from model to function ?

Question

AMAL KRISHNA.S 2021-4-8

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/796092-how-to-call-a-matrix-1-43-from-model-to-function

回答： Jan 2021-4-8

%model 
rep=ode45(@Obsfun,[t(1) t(end)],[x10 x20 x30 x40]);
figure(1)
plot(rep.x,rep.y(1,:))
grid
figure(2)
plot(rep.x,rep.y(2,:))
grid
    

    
    %function.
y=rep.y(1,:);% inside function . it is not working. how can i get the matrix value from model to y for inserting it in the equation 
% observer equation
x1_dot_hat=(((a1*x2hat*x1hat)/(a2*x1hat+x2hat))-(x1hat*u)-(2*theta*(x1hat-y)));
x2_dot_hat=(((theta^2)*(((-x2hat^2)/(a1*a2*x1hat^2))-((2*x2hat)/(a1*x1hat))-(a2/a1))+2*theta*(x2hat^2/a2*x1hat^2))*(x1hat-y)-((a3*a1*x1hat*x2hat)/(a2*x1hat+x2hat))+(a4*u)-(x2hat*u));

hope you will help as soon as possible.

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Jan 2021-4-8

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Answer 1

Jan 2021-4-8

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/796092-how-to-call-a-matrix-1-43-from-model-to-function#answer_670312

在 MATLAB Online 中打开

You can't. rep is the final answer of the integration. Of course you cannot access it before the integration is ready.

Please explain, why you think you need the output of the integration for the integration.

It supports to understand your problem, if you post the complete code, which runs by copy&paste. Expressions like " %function." are not clear. The general information "it is not working" is less useful than a copy of the error message.

I've inserted some spaces and removed some unneded parentheses:

x1_dot_hat = (a1*x2hat*x1hat) / (a2*x1hat+x2hat) - x1hat*u - 2*theta*(x1hat-y);
x2_dot_hat = (theta^2 * ((-x2hat^2 / (a1*a2*x1hat^2)) - (2*x2hat / (a1*x1hat)) - ...
    (a2/a1)) + 2*theta*(x2hat^2 / a2*x1hat^2)) * (x1hat-y) - ...
    (a3*a1*x1hat*x2hat) / (a2*x1hat+x2hat) + a4*u - x2hat*u;