plotting logarithmic and linear scale

I'm working on an assignment that wants me to create a .m file that graphs both the linear and logarithmic scale.

The assignment is:

I have the script doing exactly what I need it to for the linear scale plot, however, I'm not sure how to also get matlab to transition it to log scale for the second set of plots. any help would be useful.

The code I have so far is:

t=linspace(0,20,1000);
speed=188.5*(1-exp(-0.4*t));
torque=10*exp(-0.4*t);
power=torque.*speed;
figure(1)
subplot(3,1,1)
plot(t,torque,'r-','LineWidth',2)
title('\bfPlot of Motor Output Torque\bf\it\tau\rm\bf_{IND},Speed\bf\it\omega_{m},and Power\bf\itP vs Time')
ylabel('\bf\itTorque, \tau\rm\bf_{IND}(N-m)')
grid on
subplot(3,1,2)
plot(t,speed,'r-','LineWidth',2)
ylabel('\bf\itSpeed, \omega_{m}\rm\bf(rad/s)')
grid on
subplot(3,1,3)
plot(t,power,'r-','LineWidth',2)
xlabel('\bfTime,t[s]')
ylabel('\bf\itPower, P\rm\bf(watts)')
grid on

the plots of the log scale should look like this:

Answer 1

[Andreas Apostolatos]

Hello,

You can use function 'semilogy' for your needs, please visit the following documentation page accordingly,

https://www.mathworks.com/help/matlab/ref/semilogy.html

Simply replace command 'plot' with 'semilogy' and you should already obtain the desirable plots in logarithmic scale.

I hope this helps.

Kind Regards,

Andreas

[Brendan Clark]

Thank you! That was exactly what I was missing.