input function as plot title?

im creating a function that plots a user input function. i want the title to be just the function entered, but when i run the code, it displays the whole long vector that the function outputs.

fh=input('Enter a function: ');
minimum=min(fh)
maximum=max(fh)

plot(x,fh)
axis([a b floor(minimum) ceil(maximum)])
title(sprintf('%s',fh))

for example, if i input x^2 as the function, the graph would use 0 4 9 16 etc. as the title rather than just x^2.

Answer 1

[madhan ravi]

doc str2func

Answer 2

[Johannes Hougaard]

I think this would do it

function_name = input('Enter a function:','s');    
fh = str2func(strcat('@(x)',function_name));
fplot(fh,[min(x) max(x)]);

title(sprintf('%s',strrep(function_name,'.','')))