void yfgrid(lnstyle, nxdiv)

GRIDOPTS.C

Level 1

 

char lnstyle	= 0 for no y axis subdivisions.  = -1 for tick marks only.  = 1–9 selects the line style used by dashf().
int nydiv	The number of desired ticks between main grid lines on the y axis. For example, nxdiv = 9 will create 10 subdivisions.

 

yfgrid() is like fgrid() except that grid lines are only drawn parallel to the x axis, intersecting the y axis. xfrgid() draws lines in the other direction.