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mex-file creation
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I was trying to create a mex-file, however I can't do it beacuse Matlab shows the following error: Class function_handle is not support by coder Type. I wrote the following script and functions to calculate the solution of non-linear equation.
clear
clc
ep=10^(-6); % tollerance
itermax=50; % number max of iterations
a=0; % a,b initial interval
b=2;
[x,iter] = Bisection(@f,a,b,ep,itermax)
%%%functions
function [x,iter] = Bisection(f,a,b,ep,itermax)
%
% Function for the solution of the non-linear equation
% f(x)=0
% by the BISECTION method
%
% INPUT data:
% f name of the MATLAB function implementing
% the non-linear function
%
% a,b initial interval [a,b]
% such that f(a)f(b) < 0
%
% ep tolerance (>0)
%
% OUTPUT data:
% x solution of the non-linear equation
% iter number of performed iterations
%
fa = feval(f,a);
fb = feval(f,b);
if fa*fb > 0
fprintf('\n\nThe initial interval does not satisfy f(a)f(b) < 0.')
return
end
iter=0;
% while abs(a-b) > ep+eps*max(abs(a),abs(b))
while abs(a-b) >= 2*ep && (iter < itermax)
mid = (a+b)/2;
fmid = feval(f,mid);
if fa*fmid<=0
% root in [a,mid].
b = mid;
fb = fmid;
else
% root in [mid,b].
a = mid;
fa = fmid;
end
iter=iter+1;
end
x = (a+b)/2;
function [ y ] = f( x )
y=x.^2-1;
end
1 件のコメント
Jan
2017 年 11 月 13 日
You forgot to mention, when the error occurs. Do I understand correctly, that the shown code works reliable in Matlab and it fails only, if you try to compile it? Then please explain, if compiling is really needed.
回答 (1 件)
Jan
2017 年 11 月 13 日
編集済み: Jan
2017 年 11 月 13 日
The usage of function handles is limited, if you use the coder:
- https://www.mathworks.com/help/simulink/ug/function-handle-limitations-for-code-generation.html
- https://www.mathworks.com/help/coder/ug/matlab-language-features-supported-for-code-generation.html
Did you consider these limitations? If so, how can we help you? Perhaps this helps:
3 件のコメント
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