Next: 5.1.3 Power projection Up: 5.1 Non-map Projections Previous: 5.1.1 Cartesian Linear Projection Contents Index

##
5.1.2 Logarithmic projection

Figure 5.2: Logarithmic transformation of -coordinates.

The log transformation is selected by appending an l (lower case L) immediately following the scale (or axis length) value. Hence, to produce a plot in which the x-axis is logarithmic (the y-axis remains linear), try

    #!/bin/sh
    #    $Id: GMT_log.sh,v 1.1 2001/03/21 04:10:21 pwessel Exp $
    #

    psxy -R1/100/0/10 -Jx1.5il/0.15i -B2g3/a2f1g2WSne -W1t2_2:0p -P -K -H sqrt.d > GMT_log.ps
    psxy -R -Jx -Ss0.075i -G0 -W -O -H sqrt.d10 >> GMT_log.ps

Note that if x- and y-scaling are different and a log-log plot is desired, the l must be appended twice: Once after the x-scale (before the /) and once after the y-scale.