how to plot each raw and each column of the matrix?

I have to get graphs similar to attached file

function pde1
clc; clear; close all
m=1;                      %cylindrical geometry
R=3e-3;                 %radius of lumen (m)
dm = 13.04e-6;            % TM thickness (m)
r1 =R + dm;               %radius of outer surface of membrane (m)
L=1.2;                      %height of the membrane (m)
Q =  6.5e-9;              %volumetric flow rate
D=1.76e-9;                %diffusion coefficient of ammonia in liquid m2/s
RT = 2477.6;              %J/mol
H = 1.62;                 %Henry's law constant Pam^3/mol
u0= 285.1;                %inflow concentration
zn=10;                    %  grid line z (actually  z denoted by t
xn = 10;                  % grid-steps channel x-axis(radius side)
xmesh = linspace(0,R,xn);
zspan =linspace(0,L,zn);   %counter point of length% spatial solution domain (m)
dx = 1/(xn-1);
x = [xmesh];                %x vector
z =[zspan];                 %t vector
U_a = Q/3.14/R^2;             % average velocity
sol =pdepe(m,@pdefun,@pdeic,@pdebc,xmesh,zspan);
u=sol(:,:,1)
surf(x,z,u)
xlabel('radi')
ylabel('height')
figure 
plot(x/R,u(end,:)/u0)
xlabel('radi')
ylabel('concentration')
figure
plot(z/L,u(:, end)/u0)
xlabel('height')
ylabel('c')
figure
hold on
for i =1:zn
    
    plot(x

    /R,u(i,:),'.k')
    hold off
end
xlabel('position ')
ylabel('concentration in every row')
figure
hold on
for ii =1:xn    
    plot(z/L,u(:,ii),'.')
    hold off
end
xlabel('position ')
ylabel('concentration in every colomn')
%%
function [c,f,s]= pdefun(x,z,u,DuDx)
c = U_a/D;
f = DuDx;
s=0;
end
%% initial condition
function u0 = pdeic(x)
u0 =285.1;
end
%%
function [pl,ql,pr,qr] = pdebc(xl,ul,xr,ur,z)
 
pl=0;
ql=1;
pr=u0;  
qr=1;
end
save('results.mat');
end

[Stephen23]

Note that in MATLAB square brackets are a concatenation operator, so on these lines they are totally superfluous:

x = [xmesh];
z = [zspan];

https://www.mathworks.com/matlabcentral/answers/35676-why-not-use-square-brackets

The very first line of code inside your function is not a good start:

clc; clear; close all

As the function has no input arguments its workspace is totally empty anyway, so clear does absolutely nothing. Cearing the command window does not seem particularly relevant to the functionality of this code.

"how to plot each raw and each column of the matrix?"

Either use a loop, or plot them all at once using a matrix.

[madhan ravi]

is that plot which comes inside the loop? which one are you trying to plot?

[Shangeetha Mahendran]

@madhan ravi, yes

I creat the loop because it should read every row/column

[Shangeetha Mahendran]

@stephan,

Actually i used the loop,

but it doen't work

Answer 1

[Akshay Khadse]

Assuming that you are facing difficulty in superimposing graphs, you could try any of the following suggestions:

1) Remove the 'hold off' from inside the 'for' loop. In your code, the 'hold off' during each iteration of 'for' loop causes the previous line to get replaced.

2) You could direclty plot the matrices as described in the following MATLAB Answers Page:

https://www.mathworks.com/matlabcentral/answers/386628-how-to-plot-a-matrix-with-vector#answer_308633