functions in graph.i - t

    triangle=   plotting keyword  


  sets the triangulation array for a contour plot.  The triangulation  
  array must be the same shape as the IREG (region number) array, and  
  the correspondence between mesh zones and indices is the same as  
  for IREG.  The triangulation array is used to resolve the ambiguity  
  in saddle zones, in which the function Z being contoured has two  
  diagonally opposite corners high, and the other two corners low.  
  The triangulation array element for a zone is 0 if the algorithm is  
  to choose a triangulation, based on the curvature of the first  
  contour to enter the zone.  If zone (i,j) is to be triangulated  
  from point (i-1,j-1) to point (i,j), then TRIANGLE(i,j)=1,  
  while if it is to be triangulated from (i-1,j) to (i,j-1), then  
  TRIANGLE(i,j)=-1.  Contours will never cross this "triangulation  
  line".  
  You should rarely need to fiddle with the traingulation array;  
  it is a hedge for dealing with pathological cases.  
PLOTTING COMMANDS: plc  
  Keyword,  defined at i0/graph.i   line 1149  

    type=   plotting keyword  


  selects line type.  Valid values are the strings "solid", "dash",  
  "dot", "dashdot", "dashdotdot", and "none".  The "none" value  
  causes the line to be plotted as a polymarker.  You should also  
  check the plmk function if you need polymarkers.  
  The type value may also be a number; 0 is "none", 1 is "solid",  
  2 is "dash", 3 is "dot", 4 is "dashdot", and 5 is "dashdotdot".  
PLOTTING COMMANDS: plg, plm, plc, pldj  
  Keyword,  defined at i0/graph.i   line 948