function handle does not work

Question

Stefan 2011-9-27

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/16835-function-handle-does-not-work

Hello,

I started to work with function handles. But now I need some help to fix the problem in order to run the following code:

%Test for fhandle
for iTest = 1:3
%Create m-function
functionName = ['fHandleTest_',num2str(iTest),'.m'];
[fid,message] = fopen(functionName,'w');
fprintf(fid, 'function Output = Test(x)\n');
fprintf(fid, 'Output = x; \n');
fclose(fid);
%Execute function
fhandle = str2func(functionName(1:end-2));
out = fhandle(iTest)
end;

The following error occurs when I was running that code:

Undefined function 'fHandleTest_1' for input arguments of type 'double'.
Error in fHandleTest (line 14)
out = fhandle(iTest)

Besgt regards Stefan

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Answer 1

Jan 2011-9-27

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/16835-function-handle-does-not-work#answer_22696

在 MATLAB Online 中打开

The dynamic creation of M-files is not trivial, because MATLAB does not parse the folders during execution automatically. So you have to triggfer this time-consuming procedure manually:

% Test for fhandle
for iTest = 1:3
  %Create m-function
  functionName = ['fHandleTest_', num2str(iTest), '.m'];
  [fid,message] = fopen(functionName,'w');
  fprintf(fid, 'function Output = Test(x)\n');
  fprintf(fid, 'Output = x; \n');
  fclose(fid);
    %Execute function
    fhandle = str2func(functionName(1:end-2));
    rehash;   % <== 
    % Faster alternative:
    % clear(functionName(1:end-2))
    out = fhandle(iTest)
  end