OP deleted their code for some reason. Replicating it here:
s=[0,620,2266,3482]; %Creates an array of the times under 's'
c=[62,56,40,32]; %Creates an array of the temperatures under 'c'
figure()
subplot(1,2,1)
plot(s,c,'bo-') %Plots the first graph with a linear y axis
title('Plot using rectilinear scales')
xlabel('Time (seconds)')
ylabel('Temp (degrees celcius)')
grid
subplot(1,2,2)
semilogy(s,c,'ro-') %Plots the second graph on a logarithmic y axis
title('Plot using semilogy scales')
xlabel('Time (seconds)')
ylabel('Temp (degrees celcius)')
grid
