plot 2D array using imagesc ?

how to be like him plot 2D array using imagesc?

%The number of sample in the signal
N=640;
n=0:N-1;
fo=1/640;
%The signal x whose amplitude exceeds the range [-pi,pi]
x=5*sin(2*pi*fo*n);
plot(x);
xlabel('Sample index')
ylabel('Original phase in radians')
axis([-50 710 -5.6 5.6])
title('The signal x whose amplitude exceeds the range [-\pi,\pi]')

figure, plot(x)
xlabel('Sample index')
ylabel('Unwrapped phase in radians')
axis([-50 710 -5.6 5.6])
title('The unwrapped phase')
x = 5*sin(2*pi*fo*n);
imagesc(x)
colorbar

Answer 1

[KSSV]

REad about subplot