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plotting logarithmic and linear scale

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Brendan Clark
Brendan Clark 2021 年 4 月 11 日
コメント済み: Brendan Clark 2021 年 4 月 11 日
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:

採用された回答

Andreas Apostolatos
Andreas Apostolatos 2021 年 4 月 11 日
Hello,
You can use function 'semilogy' for your needs, please visit the following documentation page accordingly,
Simply replace command 'plot' with 'semilogy' and you should already obtain the desirable plots in logarithmic scale.
I hope this helps.
Kind Regards,
Andreas
  1 件のコメント
Brendan Clark
Brendan Clark 2021 年 4 月 11 日
Thank you! That was exactly what I was missing.

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