Why does version R2020b gives errors when running functions such as fmincon, when version R2019a runs properly.
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Vitas Diktanas
2021 年 4 月 13 日
コメント済み: Bjorn Gustavsson
2021 年 4 月 14 日
This is the code I'm running:
clear;clc
syms x y z
f=8*x.^2+y.^3;
c=5-x-y;
L=f-z*c;
dL_dx=matlabFunction(diff(L,x),'Vars',[x,y,z]);
dL_dy=matlabFunction(diff(L,y),'Vars',[x,y,z]);
dL_dz=matlabFunction(diff(L,z),'Vars',[x,y,z]);
d2L_dx2=matlabFunction(diff(dL_dx,x),'Vars',[x,y,z]);
d2L_dxy=matlabFunction(diff(dL_dx,y),'Vars',[x,y,z]);
d2L_dxz=matlabFunction(diff(dL_dx,z),'Vars',[x,y,z]);
d2L_dyx=matlabFunction(diff(dL_dy,x),'Vars',[x,y,z]);
d2L_dy2=matlabFunction(diff(dL_dy,y),'Vars',[x,y,z]);
d2L_dyz=matlabFunction(diff(dL_dy,z),'Vars',[x,y,z]);
d2L_dzx=matlabFunction(diff(dL_dz,x),'Vars',[x,y,z]);
d2L_dzy=matlabFunction(diff(dL_dz,y),'Vars',[x,y,z]);
d2L_dz2=matlabFunction(diff(dL_dz,z),'Vars',[x,y,z]);
max_iterations=100;
x_search=zeros(1,max_iterations);
y_search=zeros(1,max_iterations);
z_search=zeros(1,max_iterations);
x_search(1)=2;
y_search(1)=2;
z_search(1)=0;
for n=1:max_iterations
h11=d2L_dx2(x_search(n),y_search(n),z_search(n));
h12=d2L_dxy(x_search(n),y_search(n),z_search(n));
h13=d2L_dxz(x_search(n),y_search(n),z_search(n));
h21=d2L_dyx(x_search(n),y_search(n),z_search(n));
h22=d2L_dy2(x_search(n),y_search(n),z_search(n));
h23=d2L_dyz(x_search(n),y_search(n),z_search(n));
h31=d2L_dzx(x_search(n),y_search(n),z_search(n));
h32=d2L_dzy(x_search(n),y_search(n),z_search(n));
h33=d2L_dz2(x_search(n),y_search(n),z_search(n));
H=[h11,h12,h13;...
h21,h22,h23;...
h31,h32,h33];
grad=[dL_dx(x_search(n),y_search(n),z_search(n));...
dL_dy(x_search(n),y_search(n),z_search(n));...
dL_dz(x_search(n),y_search(n),z_search(n))];
temp=[x_search(n);y_search(n);z_search(n)]-H^-1*grad;
x_search(n+1)=temp(1);
y_search(n+1)=temp(2);
z_search(n+1)=temp(3);
end
clear L
L=@(x) 8*x(1)^2+x(2)^3;
x0=[x_search(1);y_search(1)];
A=[];
b=[];
Aeq=[1 1];
beq=5;
xmin=fmincon(L,x0,A,b,Aeq,beq);
[x1,x2]=meshgrid(-4:0.01:4);
z=8*x1.^2+x2.^3;
figure;hold on
mesh(x1,x2,z)
plot(-4:0.01:4,5-(-4:0.01:4),'r')
xlabel('x1');ylabel('x2');zlabel('f')
figure;hold on
contour(x1,x2,z,20)
plot(-4:0.01:4,5-(-4:0.01:4),'r')
plot(x_search,y_search,'g')
xlabel('x1');ylabel('x2');zlabel('f')
grid
When I run it at school on version R2019a everything works. When I run it at home on version R2020b I get the following error message:
Unrecognized function or variable 'getIpOptions'.
Error in fmincon (line 846)
options = getIpOptions(options,sizes.nVar,mEq,flags.constr,defaultopt,10,0.01);
Error in example_2 (line 66)
xmin=fmincon(L,x0,A,b,Aeq,beq);
0 件のコメント
採用された回答
Bjorn Gustavsson
2021 年 4 月 13 日
Have you installed the optimization toolbox in your 2020b install? If not that is where that function resides.
Check the existence of functions with the which command:
which getIpOptions -all
HTH
2 件のコメント
Bjorn Gustavsson
2021 年 4 月 14 日
Good!
(The general advice (perhaps?) is to install everything you have the license for. If collaborating with someone that has access to a smaller number of toolboxes it is sometimes tricky to not include handy functions from some "too specialised" toolbox...)
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