Create a loop with condition

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

Answer 1

[David Hill]

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

[wissal zaher]

Thank you for the reply, I think I should explain a bit more clearly what I meant.

I have a controller that works in a loop that takes values x0 and gives out accordingly an output u such as in the end I have a set of state Xset and respectively ouputs Uset.

as follows :

x0 = [-1;1];

T_solve=100;

Xset=x0;

Uset=[];

for k=1:T_solve

u = mpc.evaluate(x0);

x1=A*x0+B*u(1);

x0=x1;

Xset=[Xset x0];

Uset=[Uset u];

end

Now I need to check for all possible initial states x0 within the range [-5;5] and see if there is an output u before running the loop.

In the end I should generate a data set of X and U to train my neural network.

[David Hill]

[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

[wissal zaher]

thank you a lot !