plsmaj - Set length of major ticks
This sets up the length of the major ticks. The actual length is the product of the default length and a scaling factor as for character height.
Redacted form: plsmaj(def, scale)
This function is used in example 29.
Many developers (who are credited at http://plplot.org/credits.php) have contributed to PLplot over its long history.
PLplot documentation at http://plplot.org/documentation.php.