function_handler matrix

Question

Hyeyun Yang 2017-1-25

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/321828-function_handler-matrix

回答： Andrei Bobrov 2017-1-25

for i = 1:1:3
px(i) = @(x) x(i);
py(i) = @(x) x(i+3);
end

Then the error occurs:

Error using horzcat
Nonscalar arrays of function handles are not allowed; use
cell arrays instead.

So when I change the code:

for i = 1:1:3
px{i} = @(x) x(i); % cell array
py{i} = @(x) x(i+3);
end

But, in this case, I can not calculate with the cell entries:

   fun = @(x)((px{1}-px{2}).^2+(py{1}-py{2}).^2).^.5;
   fminsearch(fun, [0,0,0,0]);

Then error occurs:

Undefined operator '-' for input arguments of type
'function_handle'.
Error in kequal_4sub2>@(x)((px{1}-px{2}).^2+(py{1}-py{2}).^2).^.5
Error in fminsearch (line 189)
fv(:,1) = funfcn(x,varargin{:});
Error in kequal_4sub2 (line 7)
 fminsearch(myfun, [0,0,0,0])