Generating a signal of 200 KHz BW at 1 MHz carrier

[Communications_Engineer]

Hello,

How can I generate a 200 KHz wide signal, centered at 1 MHz in Matlab?

% For Carrier signal
Fc = 1e6;
Fs =4*Fc; 

T = 1/Fs;
n = 0:T:1;

Carrier = cos(2*pi*Fc*n);

But what about the 200 KHz BW?

One more thing, rather than creating time-index from 0 to 1, I think that

n = 0:T:(Fc/Fs)^-1;

is enough too, right? One cycle for Cosine signal will represent its correct frequency