Imported variable is not transferred to fzero- function
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function y = fzero_optimset(~,~)
x = -5:.01:5;
disp('Please enter a value for variable a!')
a = input('a = ');
y = 1./(1+x.^2) + a * x - 1/2;
plot(x,y);
grid on;
hold on;
x0 = fzero('1./(1+x.^2) + a * x - 1/2',-1,optimset,.1);
plot(x0,0,'x');
end
1 个评论
Matt J
2021-9-2
@Florian Roeder's comment moved here
In line 3 of my code, user is prompted to enter a value for variable a.
When I run the code, function "y=1./(1+x.^2)+a*x-1/2" is evaluated correctly. Figure is correct as well.
When function reaches line "x0 = fzero('1./(1+x.^2) + a * x - 1/2',-1,optimset,.1);" , MATLAB shows following error message:
FZERO cannot continue because user-supplied expression ==>
1./(1+x.^2) + a * x - 1/2 failed with the error below.
Error in inline expression ==> 1./(1+x.^2) + a * x - 1/2
Undefined function or variable 'a'.
Error in fzero_optimset (line 20)
x0 = fzero('1./(1+x.^2) + a * x - 1/2',-1,optimset,.1);
How can I handle this problem? I don´t know how to change the code.
采纳的回答
a=1;
x0 = fzero(@(x) 1./(1+x.^2) + a * x - 1/2,-1)
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