How to solve this error in xticks(missing) of scatter plot?

Question

A scatter plot was plotted using matplotlib as below

    pl.title('Test Case 2.1')
    pl.scatter(df2['Cross Section'],df2['Distance'])
    pl.xlabel('Radar cross section [dBsm]')

    pl.xlim([-35, -45])
    pl.ylim(0, 65)

    pl.ylabel('Distance [m]')
    pl.xticks(np.arange(-35, -45,5))
    pl.yticks(np.arange(0, 63, 5))
    pl.grid()
    pl.show()

The x axis is missing the limits and xticks.The image is attached
How to solve this?

Answer 1

I'm not an expert in radars, so I'm going to assume you know what you are doing. Specifically, with pl.xlim([-35, -45]) you are setting a greater (absolute) value on the left, decreasing towards the right.

Now, to customize the xticks you are going to use:

plt.xticks(np.flip(np.arange(-45, -35, 1)))

It's left to you do decompose the previous command and see what each part is doing.