functions in graph.i - g


    gridxy, flag  
 or gridxy, xflag, yflag  

  Turns on or off grid lines according to FLAG.  In the first form, both  
  the x and y axes are affected.  In the second form, XFLAG and YFLAG  
  may differ to have different grid options for the two axes.  In either  
  case, a FLAG value of 0 means no grid lines (the default), a value of  
  1 means grid lines at all major ticks (the level of ticks which get  
  grid lines can be set in the style sheet), and a FLAG value of 2 means  
  that the coordinate origin only will get a grid line.  In styles with  
  multiple coordinate systems, only the current coordinate system is  
  The keywords can be used to affect the style of the grid lines.  
  You can also turn the ticks off entirely.  (You might want to do this  
  to plot your own custom set of tick marks when the automatic tick  
  generating machinery will never give the ticks you want.  For example  
  a latitude axis in degrees might reasonably be labeled "0, 30, 60,  
  90", but the automatic machinery considers 3 an "ugly" number - only  
  1, 2, and 5 are "pretty" - and cannot make the required scale.  In  
  this case, you can turn off the automatic ticks and labels, and use  
  plsys, pldj, and plt to generate your own.)  
  To fiddle with the tick flags in this general manner, set the  
  0x200 bit of FLAG (or XFLAG or YFLAG), and "or-in" the 0x1ff bits  
  however you wish.  The meaning of the various flags is described  
  in the file Y_SITE/gist/  Additionally, you can use the  
  0x400 bit to turn on or off the frame drawn around the viewport.  
  Here are some examples:  
     gridxy,0x233 default setting  
     gridxy,,0x200       like, but no y-axis ticks or labels  
     gridxy,,0x231       like, but no y-axis ticks on right  
     gridxy,0x62b default setting  
  The three keywords base60=, degrees=, and hhmm= can be used to get  
  alternative tick intervals for base 60 systems instead of the  
  usual base 10 systems.  The keyword values are 0 to restore the  
  default behavior, 1 to set the feature for the x axis, 2 to set it  
  for the y axis, and 3 to set it for both axes.  The base60 feature  
  allows ticks and labels at multiples of 30 (up to +-3600).  The  
  degrees feature causes labels to be printed modulo 360 (so that a  
  scale which runs from, say, 90 to 270 will be printed as 90 to 180  
  then -180 to -90, mostly for longitude scales).  The hhmm feature  
  causes labels to be printed in the form hh:mm (so that, for example,  
  150 will be printed as 02:30, mostly for time of day scales).  
KEYWORDS: color, type, width, base60, degrees, hhmm  
  Builtin function, documented at i0/graph.i   line 857  

SEE ALSO: window,   plsys,   limits,   range,   logxy,   viewport