Create a loop with condition

2022 11 29
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更新时间：2022 11 30
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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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David Hill
David Hill 2022-11-29

1 个投票

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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wissal zaher
wissal zaher 2022-11-29
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
David Hill 2022-11-29
[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
wissal zaher 2022-11-30
thank you a lot !

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