1 CLEAR:CLS:PRINT "2DPLOTFN-plots a 2-Dimensional (multi-value) Rectangular or Polar function":PRINT" eg. on line 100 type: 100 F=X^2+Y^2-4 or 100 F=R-1-COS(T)"
2 W=70:N=10:W=W-1:DIM M$(4),Y(W):G=-.0000001:INPUT "MENU: Rectangular/Polar (1/0)=";Z:REM G avoids SGN(F)=0
3 FOR J=0 TO INT(W/5):M$(0)=M$(0)+"v----":NEXT J:PRINT"Due to workload, Plotting takes a little time...."
4 FOR J=0 TO W:M$(1)=M$(1)+"-":NEXT J:PRINT"W=Screen TAB width on line 2. Zero is shown as 'O' if it occurs on a plot line"