REM 関数のグラフ
SET WINDOW -2,2,-2,2
DRAW axes
DEF f(x)=x^3-x
LET h=0.1
SET LINE COLOR 2
FOR x=-5 TO 5-h STEP h 
   WHEN EXCEPTION IN
      PLOT LINES:x,f(x);x+h,f(x+h)
   USE
      PLOT LINES
   END WHEN
NEXT x
DEF g(x)=x^4-2*x^2
SET LINE COLOR 3
FOR x=-5 TO 5-h STEP h 
   WHEN EXCEPTION IN
      PLOT LINES:x,g(x);x+h,g(x+h)
   USE
      PLOT LINES
   END WHEN
NEXT x
END