How to get two lines and double y axis on plot?

I know this is simple and I have done it before, but for some reason this is not working and I have been trying this for way too long and am so frustrated. I have plotted both on a figure and know the two lines are not exactly the same. I am trying to plot 2 data sets (the same length) against time, and have two y axis. Here is what I have that is not working.

figure(1)

yyaxis right

plot(tR1,PR1)

ylabel('Pressure (Pa)')

hold on

yyaxis left

ylabel('Heart Flow Rate (mL/s)')

plot(tR1,FR1)

xlabel('Time (s)'),

legend('Blood Pressure','Flow Rate')

Answer 1

[madhan ravi]

figure(1)

yyaxis left

plot(tR1,PR1)

ylabel('Pressure (Pa)')

hold on

yyaxis right

plot(tR1,FR1)

xlabel('Time (s)')

ylabel('Heart Flow Rate (mL/s)')

legend('Blood Pressure','Flow Rate')