How do I produce a plot as a line, not just single points?

When I use the following code, the graph plots correctly, as single points.

figure; 
hold on;
deltaH=-20;
R=0.001987;
T1=305;
Kc1=1000;

for T=300:10:600;
    Kc=Kc1*exp(-(deltaH/R)*((1./T)-(1/T1)));
    X=(4-sqrt(4+48/Kc))/(2-8/Kc);
   plot(X,T,'.','color','b') %plot of equilibrium conversion vs temperature
end

However, if I replace:

'.' with '-.'

the graph does not plot as a line, instead an empty plot is produced. How can I fix this?

Answer 1

[JESUS DAVID ARIZA ROYETH]

solution:

figure; 
%hold on;
deltaH=-20;
R=0.001987;
T1=305;
Kc1=1000;
T=300:10:600;
Kc=Kc1.*exp(-(deltaH/R).*((1./T)-(1./T1)));
X=(4-sqrt(4+48./Kc))./(2-8./Kc);
plot(X,T,'-*','color','b') %plot of equilibrium conversion vs temperature

[Warren Duke]

Thanks for the quick response!