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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votes
2 answers
How to get a handle to an overriden built-in function?
On my Matlab path there's a custom zeros function. I want to store a handle to the built-in zeros in a variable. How can I do that?
Thought about @(varargin)builtin('zeros',varargin{:}), but this would probably slow down the operation due to the…
Michael Litvin
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Deciphering a Function Handle Solution Found in http://stackoverflow.com/a/13135833/560821
So... I can understand matlab function handles and its purposes. But sometimes, when it gets too cryptic, I require help in further elaborating it.
Take this example from the default MATLAB documentation, say:
f = @(x)x.^3-2*x-5;
I can also…
Denz Choe
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2 answers
Passing a function as an argument into another function won't compile without using quotes ''?
When I pass a function (let's call it f) into my Base function , the Base function doesn't recognize
the f function , without using '' quotes , here's the code :
function y = test(a, b, n ,f)
if ( rem(n,2) ~= 0 )
error ( 'n is not even'…
JAN
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MatLab recursion error (beginner)
Ok. So i've got two function in MatLab that are calling each other.
Riemann.m
function I = Riemann(f, dx, a, b)
x = a:dx:b;
fx = f(x).*dx;
I = sum(fx);
and myfunc.m
function f = myfunc(x)
f = sin(1./x);
for n=1:100
I =…
Matti Lyra
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Julia Function Handle
I want to perform a function_handle in Julia as MATLAB does.
Suppose I create a function in MATLAB like this:
fn = @(b, x) process(b, x, @trans);
And then I put this function as input of another function function m = AnotherFunc(m, l, func) where m…
sssss
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How to set up an anonymous function to take vector input in Octave?
I would like to define an anonymous function that takes a vector, but I am unable to achieve that unless every element in the vector is specified:
Data =
[ X11 X12;
X21 X22];
Iteration #1: V -> [X11 X12] (desired row of values to be passed into…
broccolee
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2 answers
function handle to nested function not working for some values of parameter
This function is supposed to return a function handle to the nested function inside, but if the variable x is set to a negative value in the outer function, it doesn't work.
The inner nested function is just a constant function returning the value…
overglow
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1 answer
Passing matrix element as function handle
I have applied inverse laplace transform to a matrix and now it is a function of t. My goal is to substitute t value and get the result matrix. I intended this code to be pretty straight foward but I'm not getting it work. This is what I…
Rezik
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Error using fzero in Matlab: Undefined function or method 'det' for input arguments of type 'function_handle'
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,…
Rambaldi
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How do I call a function handle with an vector rather than a list of arguments?
I was wondering how to call a function handle with an vector of inputs - rather than the list of aguments.
So if I have a function handle which is defined: (I guess it will be clear that I am working on fitting functions here)
fitFunctionHandle =…
JPH
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why do i get fminsearch undefined function error
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…
neoborg
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1
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1 answer
Make a MATLAB function explicit
I am using a toolbox in MATLAB and I'm not ready to make any change to the functions within it.
Let's say that it has a function f = @(x,l) g(x)*h(l)
I want to call f at different x but always the same l:
l = 3;
f2(x) = @(x) f(x,l);
for…
Ludo M
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1 answer
MATLAB: Summing function handles
I'm trying to automatically create a function handle that is a sum of function handles. When I tried to do this manually, it worked:
f1 = @(x) x(1);
f2 = @(x) x(2);
f3 = @(x) x(3);
f = @(x) f1(x)+f2(x)+f3(x);
But when I tried to do this…
Felipe Carvalho
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I want to feed in a function handle into a matlab function I made
I am trying to feed a function handle into the function I created below. I'm not exactly sure how to do this.
For example, how do I get:
conjugate_gradient(@(y) ABC(y), column_vector, initial_guess)
to not error?
If I use matlab's pcg function in…
SomeDude
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1 answer
How to assign values to variables in a handle function?
This is simplified but take as an example the following MATLAB function handle:
F = @(x)[x(1)-x(2);x(2)-x(3)]
The system has of course has many solutions. Is it possible to obtain a solution for a function like this one after substituting at least…
ser
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