|void xlab (on_off, labstr)||LABSET.C||Level 1|
|int on_off||= 0 to turn off the x axis string labels (default).
= 1 to turn on the x axis string labels.
|char *labstr[ ]||An array of pointers to the individual string labels for each successive tick mark.|
|xlab() turns on or off the x axis string label option.
When it is on, each string is positioned at a tick mark in the same
way as numerical labels. There must be at least as many string elements in the array as there are x tick marks. You must ensure that the string will fit between the tick marks. See the example BARTEST.C to see how to use string labels.