Plot a line out of a 2D array

I have a 2D array of 120 x 50 . This is a 1-D Carburisation Problem program to find out concentration profile of C from surface to centre.

So herein, i wish to highlight and showcase only the value of C after 1hr , 3hr and 10hrs and plot them

How do i do that?

% Geometrical parameters
Cs = 1;
L = 0.005; %length of steel piece
D = 2*10^(-11); %diffusivity of carbon in iron
N = 50; %number of grid points
dx = L/(N-1); 
x = [0:dx:L];
t = 36000; % total time 10hrs
dt = 300; % time step
K = t/dt; %iteartion
Co(1:K,1:N)= 0.20; 
C(1:K,1:N) = 0.20;
 
AE(1:N) = D/(dx);
AE(1) = 0; % west boundary
AE(end) = 0; % east boundary

AW(1:N) = D/(dx);
AW(1) = 0; % west boundary

Apo(1:N) = dx/(dt);
Apo(end) = dx/(2*(dt));

AP = AE + AW + Apo;
AP(1) = 1;

p = -AW;
q = AP;
r = -AE;
d(1:N) = 0;

for i = 1:K
  d = Apo.*Co(i,1:N);
  d(1) = Cs;
  C(i,1:N) = TDMA(p,q,r,d);
  Co(i+1,1:N) = C(i,1:N);
end

[KSSV]

Read about plot.

[Rafael Hernandez-Walls]

TDMA?