为何第二个曲线不显示虚线呢

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我的程序如下，但是第二个曲线为何不显示虚线呢？

proc fcmp outlib=sasuser.funcs.math_stat;

  function g(u);
    if (u le  -0.25) then return (2*log((1+0.25*0.25)/(1+1.25*1.25)));
    if (u ge   1.25) then return (2*log((1+1.25*1.25)/(1+0.25*0.25)));
      else return(2*log((1+u*u)/(1+(u-1)*(u-1))));
  endsub;
run;

proc fcmp outlib=sasuser.funcs.math_stat;

  function f(u);
    return(2*log((1+u*u)/(1+(u-1)*(u-1))));
  endsub;
run;

options cmplib =sasuser.funcs;
data a;
do x=-5 to 5 by 0.01;
l=f(x);
lstar=g(x);
output;
end;
run;

proc gplot data=a;
plot l*x=1 lstar*x=2/overlay;
symbol1 i=join v=none;
symbol2 line=3;
label l='lr';
run;

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关键词：不显示 function sasuser options Overlay function return 程序

The symbol statement doesn't work well without color specifications. I forgot the reason somebody mentioned long time ago.
/*
Controlling Consecutive SYMBOL StatementsIf you specify consecutively numbered SYMBOL statements and you want SAS/GRAPH to use each definition only once, use color specifications to ensure that each SYMBOL statement generates only one symbol definition. You can do the following actions:

• specify colors on each SYMBOL statement, using the COLOR=, CI=, CV=, or CO= options. This method lets you explicitly assign colors for each definition. For example, these statements generate four definitions: symbol1 value=star color=green;symbol2 value=square color=yellow;symbol3 value=special color=cyan;symbol4 value=special color=orange;
  
  
• specify a default color for all SYMBOL statements using the CSYMBOL= option in the GOPTIONS statement. This method makes it easy to specify the same color for each definition when you do not need more explicit color specifications.
  
  
• limit the color list to a single color using the COLORS= option in the GOPTIONS statement. This method makes it easy to specify the same color for each definition when you want the color to apply to other definitions also, such as PATTERN definitions*/
  
  
  

1. symbol1 c=blue i=join v=none;
   
2. symbol2 c=red line=3

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