"Undefined function 'rk' for input arguments of type 'inline'." error

2 次查看（过去 30 天）

ZhenQi 2012-12-4

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/55600-undefined-function-rk-for-input-arguments-of-type-inline-error

function r = rk(a, b, h, f)
n = (b-a)/h;
t = a;
w = 1/3;
for i = 1:n
    kone = h * f(t,w);
    ktwo = h * f(t+h/2,w+kone/2);
    kthr = h * f(t+h/2,w+ktwo/2);
    kfou = h * f(t+h,w+kthr);
    w = w + (kone + 2*ktwo + 2*kthr + kfou)/6;
    t = a + i*h;
    fprintf('w=%f        t=%f\n',w,t);
end
r = 0;

why does it always give me an error? my other function has exactly the same structure as this one and it works!!!!

采纳的回答

Walter Roberson 2012-12-4

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/55600-undefined-function-rk-for-input-arguments-of-type-inline-error#answer_67406

在 MATLAB Online 中打开

Make sure that this is stored in rk.m and that the file is on your MATLAB path. Use

which -all rk

to see if it is on your path.

7 个评论
显示 5更早的评论隐藏 5更早的评论

ZhenQi 2012-12-4

haha ok now this is interesting.

i went into the path folder using the windows explorer, and NOTHING is there! not even the file that DOES work is there. is it hidden? how can this be! and i tried to open it again using matlab File->open->bla bla bla->rk and it IS there.

ZhenQi 2012-12-4

oh thank you i got it to work for some reason i quit the program, came back in, reassigned the folder path to what i had before and i magically works now

请先登录，再进行评论。