MATLAB 2019b Update 1 Function semilog doesn't work on macOS Catalina

When i am trying to plot semilog figures, the semilog* function works as no difference with the normal plot function.

My system is macOS Catalina, MATLAB version is 2019b update 1.

Answer 1

[Star Strider]

It could be that your data values are not much different, so semilogx or semilogy may not seem different.

To test that hypothesis, try this and see if there is a difference between the figures:

x = linspace( 1, 10,10);
y = logspace(-2, 2, 10);

figure
plot(x, y)
grid

figure
semilogy(x, y)
grid

Experiment to get the result you want.

[Yiqian Qian]

I am sure my data is different in plot and semilogy or semilogx. The problem is semilog* works fine in command window, but it's not working in a script. I think it is a bug.

[Star Strider]

There should be no difference.

Run my code ina script and in the Command Window. It should produce the same result.

[Yiqian Qian]

Not working on my system.

[Star Strider]

Use the telephone handset icon in the upper right corner of this page and use the Contact Us link to submit a bug report.

Include the URL of this thread.

[Walter Roberson]

Is the script that it is not working in, LiveScript ?

[Yiqian Qian]

No, it's normal script. I figured it out more specific, using the script given by Star Strider before, with a slghtly change:

x = linspace( 1, 10,10);
y = logspace(-2, 2, 10);
figure
plot(x, y)
hold on
semilogy(x, y)
grid 

This only gives me one curve, it seems I can't plot these two curves together.

[Yiqian Qian]

I think I got it, is it because they have different axis properties, so I can't plot them together.

[Walter Roberson]

Out of curiosity, what happens if you reverse the order, doing the semilogy first?

[Yiqian Qian]

Yea, give semilogy without plot(x,y)

[Star Strider]

You used the hold function, but did not mention that before. In the code I suggested that you use to test for this problem, each plot was to a new axes and a new figure.

Note that the axis properties of the first call to a plot function when using hold govern the subsequent plots to those axes.

If my Answer helped you solve your problem, please Accept it!

[Yiqian Qian]

Thanks bro

[Star Strider]

As always, my pleasure!