Error: Function definition not supported in this context. Create functions in code file.

Question

MILAN Barot 2020-5-7

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/523621-error-function-definition-not-supported-in-this-context-create-functions-in-code-file

评论： Walter Roberson 2020-5-10

function xc = bisect(f,a,b,tol)
if sign(f(a))*sign(f(b)) >= 0,
  error('f(a)f(b)<0 not satisfied!') %ceases execution
end
fa=f(a);
fb=f(b);
k = 0;
while (b-a)/2>tol
  c=(a+b)/2;
  fc=f(c);
  if fc == 0              %c is a solution, done
    break
  end
  if sign(fc)*sign(fa)<0  %a and c make the new interval
    b=c;fb=fc;
  else                    %c and b make the new interval
    a=c;fa=fc;
  end
end
xc=(a+b)/2;  

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Walter Roberson 2020-5-7

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/523621-error-function-definition-not-supported-in-this-context-create-functions-in-code-file#answer_430865

you need to store that code in a file named bisect.m

It is not possible to define this kind of function at the MATLAB command line.

2 个评论
显示无隐藏无

MILAN Barot 2020-5-10

Could you please elaborate

Walter Roberson 2020-5-10

在 MATLAB Online 中打开

The error you got "Function definition not supported in this context" is caused by one of two things:

1) In R2016a or earlier, you tried to define a function inside a script -- that is, you had at least one executable line that is not inside any function before the function definition. Defining functions inside scripts is permitted in R2016b and later, and if you had made a mistake in defining a function inside a script in R2016b or later you would have received different error messages; or

2) You tried to define a function at the MATLAB command line, or inside code that you eval() or evalc(). For example,

>> function xc = bisect(f,a,b,tol)
 function xc = bisect(f,a,b,tol)
 ↑
Error: Function definition not supported in this context. Create functions in code file.

It is not permitted to define a function at the MATLAB command line. Instead you need to give the command

edit ./bisect

and paste the code you show into the editor session that comes up, and save the file as bisect.m . Or instead of the "edit" command, you can use the toolbar New -> Script menu entries.

请先登录，再进行评论。