matrice problem in sim command

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mehmed celebi 2015-5-17

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https://ww2.mathworks.cn/matlabcentral/answers/217179-matrice-problem-in-sim-command

评论： mehmed celebi 2015-5-18

Hi,

I have an extraordinary problem in simulink. I have a simulink mdl file. When I run this file from command line with sim command with a matrice name for ex: A(1,:), it gives a normal result. But when I copy the this matrice row and paste it in command line it gives another result!

(En_iyi2(5,1:5)) gives 0.45 and tracklsq3([1.5000 1.0800 0.6000 0.1200 0.5200]) gives 0.0407 , another result! Both of them is the same matrice. What is the solution. This is the tracklsq3 file:

function [yout] = tracklsq3(pid)
       % Track the output of optsim to a signal of 1
         % Variables a1 and a2 are shared with RUNTRACKLSQ
         Kp = pid(1);
         Ki = pid(2);
         lambda = pid(3);
         Kd = pid(4);
         mu = pid(5);
  simopt = simset('solver','ode23t','SrcWorkspace','Current','DstWorkspace','Current');  % Initialize sim options
         [tout,xout,yout] = sim('mehmed5_48V_1kW',[0 .04],simopt);

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Answer 1

Walter Roberson 2015-5-17

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https://ww2.mathworks.cn/matlabcentral/answers/217179-matrice-problem-in-sim-command#answer_179416

在 MATLAB Online 中打开

You have a difference in rounding between the actual binary numbers and what is being displayed. Try using

format long g
disp(En_iyi2(5,1:5))

and your values will probably show up differently.

In some cases, the above is not enough to find the problem. If you are on Linux or OS-X but not MS-Windows then you can use

sprintf('%.399g\n', En_iyi2(5,1:5))

to see the entire number. If you are on MS-Windows then you will need something like James Tursa's num2strexact to view all of the digits.

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mehmed celebi 2015-5-18

Thank you for your answer, but this is not the problem I wrote. I know the exact digit of the values. I make a matrice from real numbers. But when it was used by its name and location in the sim command, the results become different. I made something yesterday. I all copied the values of the matrice, and pasted and it works!

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