how to set y-axis as log scale?

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Rohit Bhoi
Rohit Bhoi el 15 de Abr. de 2016
Editada: MathWorks Support Team el 22 de Sept. de 2023
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 el 22 de Sept. de 2023
Editada: MathWorks Support Team el 22 de Sept. de 2023
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 comentarios
Weirong Sun
Weirong Sun el 9 de Mayo de 2022
good answer! It's very helpful!!!
mingyang zhao
mingyang zhao el 2 de Ag. de 2023
Great answer! Thank you!

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Más respuestas (2)

Rohit Sinha
Rohit Sinha el 27 de Abr. de 2022
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 comentarios
Walter Roberson
Walter Roberson el 27 de Abr. de 2022
semilogy() is the first thing I mentioned in my answer in 2016.
Nicholas Santiago
Nicholas Santiago el 4 de Nov. de 2022
yo i totally missed that I generally only read the bold stuff, thanks a ton!

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Toshia M
Toshia M el 20 de Sept. de 2023
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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