Logscale

Log scaling may be set on the x, y, and z axes.

Syntax: 

        set logscale <axes>
        set nologscale <axes>
        show logscale

where <axes> may be any combinations of x, y, and z, in any order. If <axes> is not given then all three axes are assumed. The command set logscale turns on log scaling on the specified axes, while set nologscale turns off log scaling.

Examples:

To enable log scaling in both x and z axes: 

       set logscale xz
To disable z axis log scaling: 
       set nologscale z