How to replace variable name in function handle?

I have a function handle as given below

f = @(x1,x2) x1*x2

and I want to change variable name to

f = @(x) x(1)*x(2)

Please help me

Thanks

PS: The function is just for illustration purpose

[Marco Aurélio]

Hello Matlab mate.

I think you must redefine de function handle just rewriting like this:

f=@(x) prod(x);

Answer 1

[Stephan]

Hi,

for me this worked:

f = @(x1,x2) x1*x2
f = string(char(f));
f = replace(f,"@(x1,x2)","@(x)");
f = replace(f,["x1","x2"],["x(1)","x(2)"]);
f = str2func(f)

result is:

f =

  function_handle with value:

    @(x1,x2)x1*x2


f =

  function_handle with value:

    @(x)x(1)*x(2)

Best regards

Stephan

[madhan ravi]

stephen what if there are 100 inputs to the function handle? it would be not a good idea

[Stephan]

You are right. But i think this function is worth to be shown here as an alternative for small examples. Maybe it is not the best / most efficient solution here. Yours is pretty nice - but the OP asked for how to replace variable names in a function handle - this is what i was answering to.

Answer 2

[madhan ravi]

Instead of converting it to your later need convert the vector as comma separated list using num2cell():

x=rand(1,2); % example vector
X=num2cell(x);
f(X{:}) % pass the vector all at once