求助高手
clear allsyms z0 z1 x1 x2 y0 n
n=0;
z0=
f=x1^2+4*x2^2;
v=;
df=jacobian(f,v);
Q=jacobian(df,v);
g=-df;
eps1=1e-4;
eps2=1e-5;
f0=subs(f, {x1,x2},{z0(1,1),z0(1,2)});
g0=subs(g, {x1,x2},{z0(1,1),z0(1,2)});
h0=;
p0=-g0;
z1=z0-((g0*g0')/(g0*Q*g0'))*g0;
f1=subs(f, {x1,x2},{z1(1,1),z1(1,2)});
g1=subs(g, {x1,x2},{z1(1,1),z1(1,2)});
while(f1<0.1)
end
x1;
f1;
g1
运行后出现 ??? Function 'lt' is not defined for values of class 'sym'.
怎么解决！！！！！！！！
回复
while(f1<0.1)end
中间什么都没有,怎会不出错?
这个也是这样
function =lsliu(f,z0,h)syms x1 x2 y1 y2 z1 z2
y0=subs(f,,z0);
%n=0
z2=z0+h;
y2=subs(f,,z2);
if(y2>=y0)
z1=z2;
y1=y2;
h=-h;
else
z1=z0;
y1=y0;
z0=z2;
y0=y2;
h=2*h;
end
z2=z0+h;
y2=subs(f,,z2);
while(y2<=y0)
z1=z0;
y1=y0;
z0=z2;
y0=y2;
h=2*h;
z2=z0+h;
y2=subs(f,,z2);
end
z1=z0;
a=min(z1,z2);
b=max(z1,z2);
eps=0.05;
z1=a+0.382*(b-a);
y1=subs(f,,z1);
z2=a+0.618*(b-a);
y2=subs(f,,z2);
while (abs(b-a)>eps);
if (y1>=y2)
a=z1;
b=b;
z1=a+0.382*(b-a);
y1=subs(f,,z1);
z2=a+0.618*(b-a);
y2=subs(f,,z2);
elseif y2>y1
a=a;
b=z2;
x1=a+0.382*(b-a);
y1=subs(f,,z1);
z2=a+0.618*(b-a);
y2=subs(f,,z2);
end
end
z=(z1+z2)/2;
??? Function 'ge' is not defined for values of class 'sym'.
Error in ==> lsliu at 38
if (y1>=y2)
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