Can I use if statement in constraint function for optimization ?

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siddhesh rane 2017-10-30

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https://ww2.mathworks.cn/matlabcentral/answers/364015-can-i-use-if-statement-in-constraint-function-for-optimization

评论： Weihan Lin 2021-8-27

I have a constraint functions which call another function(inverse_kinematics) for calculating some of the constraints, inverse_kinematics() will give error if c(1) and c(2) are not satisfied, how can I ensure that c(1) and c(2) are satisfied before calling inverse_kinematics() function? Can I address it by using if condition in my constraint function? Below is code of my optimizatio0n function,

function [c, ceq] = simple_constraint(l1,l2,l3)
c(1) = l3^2 + 200*l3*cos(30) + 10000 - (l1 + l2)^2;
c(2) = (100- l3*cos(30))^2 + (100*sin(30))^2 - (l1-l2)^2;
thetas = inverse_kinematics(l1,l2,l3);
c(3) = thetas(4,1) - 160;
c(4) = thetas(4,2) - 160;
c(5) = thetas(4,3) - 160;
c(6) = 20 - thetas(4,1);
c(7) = 20 - thetas(4,2);
c(8) = 20 - thetas(4,3);
c(9) = thetas(5,1) - 340;
c(10) = thetas(5,2) - 340;
c(11) = thetas(5,3) - 340;
c(12) = 200 - thetas(5,1);
c(13) = 200 - thetas(5,2);
c(14) = 200 - thetas(5,3);
c(15) = thetas(6,1) - 340;
c(16) = thetas(6,2) - 340;
c(17) = thetas(6,3) - 340;
c(18) = 200 - thetas(6,1);
c(19) = 200 - thetas(6,2);
c(20) = 200 - thetas(6,3);
ceq = [];
end