How to set the interval of x-axis from a large value to a small value and set the steps of interval in fsurf

The screenshot above is my goal. This equation has two variables: k23 and Frequency. As you can see, the range of two variables going down from 0.1 to 0.001 and from 12 to 8.

This is the MATLAB plot I derived, frequency from the left to right can only keep increasing. How do I set it to decrease from left to right?

In addition, the variable k23 only increase by 0.05 steps. How do I set the steps to decades?

Answer 1

[Star Strider]

‘How do I set the steps to decades?’

Purely guessing, the logspace function could be appropriate, then set that axis to be logarithmic using the appropriate setting commands as described in XScale or YScale. You will likely have to experiment.

[KEDI YAN]

Thanks! I figure it out by doing set(gca, 'YScale', 'log')

How do I set the steps of interval if the axis is linear?

[Star Strider]

For a linear axis, it depends on the version of MATLAB that you have. Use the YTick function to set the y-tick values. Use the linspace function or the colon operator, depending on which works best for you to define the values.

[KEDI YAN]

I got it work! Thanks.

Last question, how do I inversly plot the x-axis. You can see the first attached image, the Frequency is from 12 to 8. In my plot, mine is from 8 to 12.

[Star Strider]

As always, my pleasure!

Likely the easiest way:

set(gca, 'XDir','reverse')

See Axes Properties for a comprehensive list of the properties you can change.

[KEDI YAN]

Thanks so much! Now it totally matches the plot that I expected!

[Star Strider]

As always, my pleasure!