How can I fit the parameters using mle with a self-defined function?

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I 'm trying to fit the patameter of normal distribution using mle function I didn't use the built in function but with a self-defined function

Codes are as follows

clear;
clc;
f=@(x,mu,sigma) 1/sigma/sqrt(2*pi)*exp(-(x-mu).^2/2/sigma^2);
x=normrnd(0,1,[1000,1]);
pha=mle(x,'pdf',f,'Start',[0,1])
pha = 1×2
    0.0346    1.0211

f is a function of the standard normal distribution I am using the mle function to fit the parameters but an error of "Numbers of input are not correct" happened I think a period of time but fail to find the soluition Can anyone help to solve this problem? Thanks