How to use subplot in a loop?

Hello there this is the code snippet. I want to use subplot for say 3 X 3 grid. But I am not able to give correct position.

t=0:.001:5;
% for a period of 1sec 10 cycles and duty cycle of 20
f=input('Enter Frequrncies: ');%[5 10 15];
d_t=input('Enter Duty cycles: ');%[20, 50,80];
for i=1:length(f)
    for j=1:length(d_t)
sq=square(2*pi*f(i)*t,d_t(j));
subplot(length(f),length(d_t),i*j)
plot(t,sq)
title(sprintf('%dHz square function for a duty cycle of %d',f(i),d_t(j))) 
xlabel('Time') 
ylabel('Amplitude') 
grid on
    end
end

Here it over writes the old plot, by multiplying (i*j) in subplot.

Answer 1

[KSSV]

for i = 1:9
    subplot(3,3,i) 
end

[kc]

This I know well sir,

I am asking for above nested loop , is there any way to pass position argument in subplot using i and j in loop?

[KSSV]

count = 0 ; 
m = length(f) ;
n = length(d_t) ; 
for i = 1:m
    for j = 1:n
        count = count+1; 
        subplot(3,3,count)
    end
end

[kc]

thank you :)