In Matlab, a function handle is a mechanism provided to allow for indirect calling of a function. Serves like a "pointer to function"
A function handle is a matlab value that provides a means of calling a function indirectly.
Questions tagged [function-handle]
159 questions
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How to specify function signature for function handles in MATLAB code generation?
I want to compile a MEX from a function that has the following code (MATLAB R2015a):
function r = MyFunc(x,type)
ind = randi(numel(x), 1);
getInd = @getIndFixed;
if strcmpi(type, 'random')
ind = numel(x);
getInd =…
Girardi
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Using handles to nested function for GUI callbacks in Octave
I am trying to develop a GUI in Octave (4.0.1, using the GUI version) with the code as follows:
Main GUI function
Function to create figure & various uicontrol
Callback function for uicontrol #1
Callback function for uicontrol #2
Callback…
am304
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Creating a function handle for each element in a vector (Matlab)
I have a following issue. I am trying to create a function handle, which is a vector. In particular, I have something like this
EQ0 = @(W) m1.^2*(exp(W))-m2.^2
where m1 and m2 are the vectors of the same dimension. So, for each m1(i) and m2(i)…
Natalia K
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How to assign one function to different UI controls in GUIDE?
I have a set of push-buttons in a figure designed in GUIDE and I want to assign one single function as their callback functions. But there is no combo-box to choose my function from in the property inspector, and when I select all buttons and click…
saastn
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1 answer
MATLAB function handles and parameters
When I type help gmres in MATLAB I get the following example:
n = 21; A = gallery('wilk',n); b = sum(A,2);
tol = 1e-12; maxit = 15;
x1 = gmres(@(x)afun(x,n),b,10,tol,maxit,@(x)mfun(x,n));
where the two functions are:
function y = afun(x,n)
y…
System
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Trouble understanding an anonymous function
I do not understand the following code:
rect2rng = @(pos,len)ceil(pos):(ceil(pos)+len-1);
From the the previous link:
BoundingBox Matlab
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1 answer
Simplify fit function in MATLAB with handle
I want to fit some data with MATLAB but my fit-function is pretty large
and I just want to put it into pieces of functions.
At first I just tried it like
p1_prime = @(x,p) ...
p2_prime = @(x,p) ...
Then I put it into my model function
mod =…
user2514356
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MATLAB ERROR Feval requires a function handle as the first argument
I have this code (*) and when I do:
»syms x
»newton_raphson({((5400.*(1 + x)*0^360) - (1450000.*x.*(1 + x).^360))}, diff(((5400.*(1 + x)*0^360) - (1450000.*x.*(1 + x).^360)),1), 0.001, eps, 5, 0.1)
this error appears:
Error using feval
…
UsherUser077
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1 answer
How to use pcg with a function in MATLAB
I am going to solve an inverse problem, AX=b, using conjugate gradient method in MATLAB. I want to use pcg function in MATLAB and as I know instead of matrix A I can use a function.
I have a function for example afun which has some entries. In the…
user2983136
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1 answer
Operations with function handle in matlab
Could you please help me with the following issue: I have the following function handle:
r1 = @(lambda) b + lambda*(r - b); % r and b are vectors of return data
I want to find the optimal lambdas that set me a mean function to zero, for a given set…
Astrid
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1 answer
Define a function with a function handler as argument
Is it possible to define a function with a function handler as an argument in Matlab?
I've tried with
function x = name(@f,gh)
but I get an error message stating Invalid syntax at '@'.
user1223333312
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1 answer
Passing C++ callbacks to matlab engine as function handles without using mex
My project is in C++. I want to use matlab optimization nonlinsq through matlab engine by "eval". I want to pass a function I wrote in C++ in the format of
void func(int nlhs, mxArray *plhs[], int nrhs, mxArray *prhs[])
to matlab as a…
user2070148
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2 answers
Evaluating a constant anonymous function in MATLAB
In Matlab, I generally do things such as
f = @(x) x.^2;
xx = 0:.1:1;
ff = f(xx);
So that f is a function handle and both xx and ff are 1x11 vectors.
However, if for some reason I need to define my function handle f like this
f = @(x) 1;
and do…
Tom
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1 answer
Error with function handles in a loop (Matlab)
I am trying to run a loop which includes a function handle. The code works well if I use any specific value for n. However, when I try to run the code within a loop it gives the error:
Nonscalar arrays of function handles are not allowed; use…
sets
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1 answer
Generating a trinomial tree in matlab
what I am trying to do is to generate a series of vectors that emulate the structure of a non-recombining trinomial tree. Here is my code:
function Trinomial_tree
S{1}(1) = 100;
w{1} = 1.4;
w{2} = 1.1;
w{3} = 0.7;
T = 2;
%Compiling the w's into a…
user5128359