Showing multiple line in graph

I am execute an output in order to show 15 curve all together in a single graph. However, my commad only manage to execute a graph with a single line.

My coding and the output are shown below.

m=input('Enter the mass of hydrogen gas in unit of kg= ');
if m<0
   disp('Invalid input.Please re-enter again the value')
end
%Molecular weight of H2=2.0g/mol
n=(m/2)*1000;
%Pressure of the gas(bar)
P=[1:50];
%Gas constant(L.bar/K.mol)
R=8.314*10^-2;
%Volume of the gas in each temperature range(L)
V1=303.15*n./P;
V2=308.15*n./P;
V3=313.15*n./P;
V4=318.15*n./P;
V5=323.15*n./P;
V6=328.15*n./P;
V7=333.15*n./P;
V8=338.15*n./P;
V9=343.15*n./P;
V10=348.15*n./P;
V11=353.15*n./P;
V12=358.15*n./P;
V13=363.15*n./P;
V14=368.15*n./P;
V15=373.15*n./P;
V=[V1;V2;V3;V4;V5;V6;V7;V8;V9;V10;V12;V12;V13;V14;V15];
V=V';
%% 
%Linetype,PointType and Colour
linetype={'-',':','-.','--','-',':','-.','--','-',':','-.','--','-',':','-.'};
pointtype={'.','+','*','s','d','.','+','*','s','d','.','+','*','s','d'};
color={'b','g','r','c','m','y','k','w','b','g','r','c','m','w','g'};
%%
%Plotting the graph
for k=1:15;
    plot(V(:,k),P,'color',color{k},'linestyle',linetype{k},'marker',pointtype{k});
end
title('Isoterms Profile of Hydrogen Gas');
xlabel('Volume/m3');
ylabel('Pressure/bar')
legend('30degC','35degC','40degC','45degC','50degC','55degC','60degC','65degC','70degC','75degC','80degC','85degC','90degC','95degC','100degC');
grid on;

Any additional command should I added or corrected?

Answer 1

[Ameer Hamza]

You need to hold() the axes object.

ax = axes(); % add these two lines
hold(ax);
for k=1:15
    plot(V(:,k),P,'color',color{k},'linestyle',linetype{k},'marker',pointtype{k});
end

or a crude but easier to understand form

hold on
for k=1:15
    plot(V(:,k),P,'color',color{k},'linestyle',linetype{k},'marker',pointtype{k});
end

[Zhi Wei Ku]

It works. Appreciate for your answer.

[Ameer Hamza]

I am glad to be of help!!