How to ask a user for an input for once ?

I am new to MATLAB and I am attempting to make a code that asks the user to input a function and then estimates the integral using Monte Carlo Method.

My problem is when I ask to enter the function, it repeats asking for the function. I only want the user to enter the function only once.

Thanks in advance for any help!

This is my code :

under = 0;
nmax = 10000;

for i=1:nmax
   x = rand;
   y = rand;
   prompt = 'Enter your function';
   z = input(prompt);
   if y <= z
      under = under +1; 
   end 
end
estimated_integration =(under/nmax); 

[Adam]

Why do you have a for loop running 10000 times? That will cause your code to ask the user for input 10000 times.

[Osama Al-Shalali]

@Adam

In Monte Carlo Method, we need to generate pretty enough random numbers to estimate an integration.

[Adam]

But you are asking the user to input a function every time and then running a test against that. Either you want that to happen 10000 times or if you don't then don't put it in the loop.

Answer 1

[KSSV]

Put the prompt which asks for input outside the loop.

prompt = 'Enter your function';
z = input(prompt);
under = 0;
nmax = 10000;
for i=1:nmax
   x = rand;
   y = rand;
   
   if y <= z
      under = under +1; 
   end 
end
estimated_integration =(under/nmax); 

Answer 2

[Osama Al-Shalali]

Thanks!

all I nedded to define

syms z x;
plot(x,subs(z));