sym에서 double로 변환할 수 없다는 오류가 뜨는데 어떻게 해결해야 할까요?
古いコメントを表示
function golden(f,a,b,tolx,toly)
r=(3-sqrt(5))/2;
c=1-r;
x1=a+r*(b-a);
x2=a+c*(b-a);
f1=feval(f,x1);
f2=feval(f,x2);
k=0;
fprintf('\n')
disp(' Golden Section Search ')
fprintf('\n')
disp('_______________________________________________________')
disp('k a x1 x2 b f(x1) f(x2)')
disp('_______________________________________________________')
fprintf('\n')
while (abs(b-a)>tolx)|(abs(f2-f1)>toly)
fprintf('%2.f %10.7f %10.7f %10.7f %10.7f %10.7f %10.7f\n',k,a,x1,x2,b,f1,f2)
if (f1<f2)
b=x2;
x2=x1;
x1=a+r*(b-a);
f2=f1;
f1=feval(f,x1);
else
a=x1;
x1=x2;
x2=a+c*(b-a);
f1=f2;
f2=feval(f,x2);
end
k=k+1;
end
fprintf('\n minimum = %14.10f',f1)
fprintf('at x = %14.10f',b)
function f=trig(x)
f=cos(x)-sin(x)
golden('f',1,3,10^-8,10^-8)을 구하고자 하는데
fprintf('%2.f %10.7f %10.7f %10.7f %10.7f %10.7f %10.7f\n',k,a,x1,x2,b,f1,f2) 여기서 sym에서 double로 변환할 수 없다는 오류가 뜹니다. k,a,x1,x2,b는 출력이 되고 f1,f2가 출력되지 않는 걸 보아 f1,f2에서 오류가 발생한 것 같은데 잘 모르겠습니다.
採用された回答
You need to pass the function to be analysed as a function handle -
% vvvvv
golden(@trig,1,3,10^-8,10^-8)
function golden(f,a,b,tolx,toly)
r=(3-sqrt(5))/2;
c=1-r;
x1=a+r*(b-a);
x2=a+c*(b-a);
f1=feval(f,x1);
f2=feval(f,x2);
k=0;
fprintf('\n')
disp(' Golden Section Search ')
fprintf('\n')
disp('_______________________________________________________')
disp('k a x1 x2 b f(x1) f(x2)')
disp('_______________________________________________________')
fprintf('\n')
while (abs(b-a)>tolx)|(abs(f2-f1)>toly)
fprintf('%2.f %10.7f %10.7f %10.7f %10.7f %10.7f %10.7f\n',k,a,x1,x2,b,f1,f2)
if (f1<f2)
b=x2;
x2=x1;
x1=a+r*(b-a);
f2=f1;
f1=feval(f,x1);
else
a=x1;
x1=x2;
x2=a+c*(b-a);
f1=f2;
f2=feval(f,x2);
end
k=k+1;
end
fprintf('\n minimum = %14.10f',f1)
fprintf('\nat x = %14.10f',b)
end
function f=trig(x)
f=cos(x)-sin(x);
end
7 件のコメント
WOOJIN
2023 年 11 月 13 日
Dyuman Joshi
2023 年 11 月 13 日
You are welcome!
WOOJIN
2023 年 11 月 13 日
Dyuman Joshi
2023 年 11 月 13 日
"how can I pass the function without using '@'? "
You can not. Why do you ask? Do you get an error?
Even if you have saved the functions separately, this syntax should work. Just make sure that the files are present in the current directory/folder.
WOOJIN
2023 年 11 月 13 日
You can define it as an anonymous function, but the functionality behind it is the same.
So, No, there is no other way.
%Anonymous function
f=@(x) cos(x)-sin(x);
%pass it as an input
golden(f,1,3,10^-8,10^-8)
function golden(f,a,b,tolx,toly)
r=(3-sqrt(5))/2;
c=1-r;
x1=a+r*(b-a);
x2=a+c*(b-a);
f1=feval(f,x1);
f2=feval(f,x2);
k=0;
fprintf('\n')
disp(' Golden Section Search ')
fprintf('\n')
disp('_______________________________________________________')
disp('k a x1 x2 b f(x1) f(x2)')
disp('_______________________________________________________')
fprintf('\n')
while (abs(b-a)>tolx)|(abs(f2-f1)>toly)
fprintf('%2.f %10.7f %10.7f %10.7f %10.7f %10.7f %10.7f\n',k,a,x1,x2,b,f1,f2)
if (f1<f2)
b=x2;
x2=x1;
x1=a+r*(b-a);
f2=f1;
f1=feval(f,x1);
else
a=x1;
x1=x2;
x2=a+c*(b-a);
f1=f2;
f2=feval(f,x2);
end
k=k+1;
end
fprintf('\n minimum = %14.10f',f1)
fprintf('\nat x = %14.10f',b)
end
WOOJIN
2023 年 11 月 13 日
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