how to set y-axis as log scale?

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I am plotting x-y plot using plot function. I want to set only y-axis as log scale and x-axis as linear? How to do that? I used loglog function but it scales both axis but I want only Y.

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Walter Roberson
Walter Roberson 2023-9-22
编辑:MathWorks Support Team 2023-9-22
The best way to create that type of axes is to use the semilogy function. Alternatively, you can set the ‘YScale’ property on the axes:
set(gca, 'YScale', 'log')
***Update from Mathworks Support Team - September 2023***
As of R2023b, you can also use the 'yscale ' function. 
  18 个评论
Weirong Sun
Weirong Sun 2022-5-9
good answer! It's very helpful!!!

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更多回答(2 个)

Rohit Sinha
Rohit Sinha 2022-4-27
The easiest way to do this is simply use the following command instead of plot
semilogy(x,y);
This will plot x axis on a linear scale and y axis on a log scale. Similarly, if you want to plot x axis on log scale and y axis on a linear scale, you can use
semilogx(x,y) ;
  2 个评论
Walter Roberson
Walter Roberson 2022-4-27
semilogy() is the first thing I mentioned in my answer in 2016.
Nicholas Santiago
Nicholas Santiago 2022-11-4
yo i totally missed that I generally only read the bold stuff, thanks a ton!

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Toshia M
Toshia M 2023-9-20
Starting in R2023b, you can change the scale of any axis after you create the plot by calling the xscale, yscale, or zscale function.
For example, create a plot of two vectors x and y. Then set the scale of the y-axis to logarithmic.
x = 1:100;
y = x.^2;
plot(x,y)
grid on
yscale log

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