Turns the log scales on/off for the X axis of one or more Windows.
SEMILOGX(W1, W2, ..., WN, mode)
WN 
 
Optional. Zero or more windows. Defaults to the current window.  
mode 
 
Optional. An integer, the X log scale mode:

Nothing, the X axis is set or unset to log X scales and the Y axis is set to linear scales.
W1: grand(1000, 1);semilogx
The series in W1 is displayed with X log and Y linear scales.
W1: grand(100, 1)
W2: integ(W1)
W3: integ(W2)
W4: integ(W3)
semilogx(W1..W4)
The series in W1 through W4 are displayed with X log and Y linear scales.
W1: grand(100, 1)
W2: integ(W1)
W3: integ(W2)
W4: integ(W3)
semilogx(W1..W4, 2)
Same as above, except the X axis values
are displayed in linear form
semilogx(W1..W4, 0)
Resets the X and Y scales to linear for the series in W1 through W4.
SEMILOGX uses SETXLOG and SETYLOG to set the X axis to log scales and the Y axis to linear scales. By default, the log tic values are displayed in 10^{N} form.