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5.1.3 Power projection

Figure 5.3: Exponential or power transformation of -coordinates.

This projection allows us to display x versus y. While a and b can be any values, we will select a = 0.5 and b = 1 which means we will plot y versus . We indicate this scaling by appending a p (lower case P) followed by the desired exponent, in our case 0.5. Since b = 1 we do not need to specify p1 since it is identical to the linear scaling. Thus our command becomes

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

    psxy -R0/100/0/10 -Jx0.3ip0.5/0.15i -Ba1p/a2f1WSne -W1p -P -K sqrt.d > GMT_pow.ps
    psxy -R -Jx -Sc0.075i -G255 -W -O sqrt.d10 >> GMT_pow.ps