function-handle

来源： https://stackoverflow.com/questions/26808668/force-evaluation-of-variables-in-matlab-anonymous-function

来源： https://stackoverflow.com/questions/26808668/force-evaluation-of-variables-in-matlab-anonymous-function

来源： https://stackoverflow.com/questions/26808668/force-evaluation-of-variables-in-matlab-anonymous-function

来源： https://stackoverflow.com/questions/26808668/force-evaluation-of-variables-in-matlab-anonymous-function

来源： https://stackoverflow.com/questions/26808668/force-evaluation-of-variables-in-matlab-anonymous-function

问题 I'm new to Matlab and I'm trying to write custom function in matlab that would take function handle as one of its arguments. I'm getting this error all the time: Error using subsindex Function 'subsindex' is not defined for values of class 'function_handle'. Trying to debug I performed following test: I run command x = fminbnd(@humps, 0.3, 1) . I proceeded as expected - I got result x = 0.6370 . So I created custom function called train and I copied ALL the code of function fminbnd to the

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 5 months ago . I'm trying to optimize a function with 2 inputs. Trying to use fminsearch but it keeps saying undefined function or variable although it is already defined. I have already defined the function in a separate script that is in the same directory with my main script. I have a classroom license which includes

问题 Is is possible to replace the following code with something which does not use exceptions? The handle x is a provided handle. I want to test it for validity (having actual code to back the handle) before use. x = @notreallyafunction; try x(); catch disp('Sorry function does not exist.'); end 回答1: To test function handles such as for screening out the bogus x=@notreallyafunction in your question, you can use the functions command to check the handle and get the referenced function's name, type

问题 I've tried this: linefunca = @(xa,ya) aa*xa + ba*ya + ca; figure(1) imshow(Pica); hold on; ezplot(linefunca,[1,1072,1,712]); But I'm returned with this error: In an assignment A(I) = B, the number of elements in B and I must be the same. Error in ezplotfeval/applyfun (line 80) z(i) = feval(f,x(i),y(i)); Error in ezplotfeval (line 65) z = applyfun(x,y); Error in ezplot>ezimplicit (line 257) u = ezplotfeval(f, X, Y); Error in ezplot (line 153) hp = ezimplicit(cax, f{1}, vars, labels, args{:});

问题 I have the same kind of problem described in this topic: Using fzero: Undefined function or method 'isfinite' for input arguments of type 'sym' Their answers really helped me, but I am still stuck. I also have to find the zeros of a function of w, this function is defined in several steps: So the only unknown is w, and I defined other objects such as: lambda= @(w) ((16*rho(i)*A(i)*w^2*Lprime(i)^2)/(E(j)*I(i)))^0.25; beta=@(w) lambda*b(i)^0.5; gamma=@(w) lambda*Lprime(i)^0.5; Then, I define a