Create a loop with condition

Question

wissal zaher 2022-11-29

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1866843-create-a-loop-with-condition

评论： wissal zaher 2022-11-30

采纳的回答： David Hill

I want to create a loop that generate random intial values x0 as (2,1) vectors within a [-5,5] range.

Each initial value x0 will give out an output U, some values give out U = NaN (calculated with a controller)

I want the loop to keep running for all the values with U not equal NaN and save them in an array Xset

The values with U = NaN can be disqualified

I would appreciate any help

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Answer 1

David Hill 2022-11-29

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1866843-create-a-loop-with-condition#answer_1115578

在 MATLAB Online 中打开

Does not seem like you need random values, but rather all values between -5 to 5

[x,y]=meshgrid(-5:.001:5);%generates all x0 pairs (x;y) within -5 to 5 with .001 step.
i=1;
for k=1:numel(x)
    U=%some function with [x(k);y(k)] input
    if ~isnan(U)
        Xset(:,i)=[x(k);y(k)];
        i=i+1;
    end
end

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David Hill 2022-11-29

在 MATLAB Online 中打开

[x,y]=meshgrid(-5:.001:5);
xset=[];
for k=1:numel(x)
    u = mpc.evaluate([x(k);y(k)]);
    if ~any(isnan(u))
        xset=[xset,k];
    end
end
T_solve=100;
Xset=[];Uset=[];
for k=1:length(xset)
    x0=[x(xset(k));y(xset(k))];
    for kk=1:T_solve
        u = mpc.evaluate(x0);
        x1=A*x0+B*u(1);
        x0=x1;
        Xset=[Xset x0];
        Uset=[Uset u];
    end
end