00100	BEGIN "TEST"
00200		REQUIRE "ABBREV" SOURCE_FILE;
00300		REQUIRE "DPYIII" SOURCE_FILE;
00400		REQUIRE "DPYIII" LOAD_MODULE;
00700		SAFE INTEGER ARRAY RAN5[0:255];
00800		INTEGER RAN1,RAN2,RAN3,RAN4,INITFLG;
00900	PROCEDURE RANDOMI;
01000	BEGIN	"INIT"
01100		INTEGER I;
01200		RAN1←1;
01300		RAN2←3; 
01400		FOR I←0 STEP 1 UNTIL 255 DO
01500		RAN5[I]←RAN2←(RAN2*3)MOD 2↑31 ;
01600		INITFLG	←	TRUE;
01700	END	"INIT";
01800	
01900	INTERNAL REAL PROCEDURE RANDOM;
02000	BEGIN	"RANDOM"
02100		IF INITFLG THEN ELSE RANDOMI;
02200		RAN1←(RAN2*1756) MOD 8191;
02300		RAN3←RAN1 DIV 32;
02400		RAN4←RAN5[RAN3];
02500		RAN2←RAN5[RAN3]←(RAN2*3)MOD 2↑31;
02600		RETURN(RAN4/2↑31)
02700	END	"RANDOM";
     

00100	α DECLARATIONS;
00200		EXTERNAL SUBR CUBFIT(ITG ARRAY A;REAL ARRAY B;ITG N);
00300		REAL X,Y; INTEGER IX,IY,I,J;
00400		SAFE ITG ARRAY DPYBUF[0:400];
00500		SAFE ITG ARRAY ZZZ[0:200];
00600		SAFE REAL ARRAY XXX[0:200];
00700		SAFE REAL ARRAY YYY[0:200];
00750		REAL SX,X2,X3,SY;
00800	
00850	α DISPLAY INITIALIZATION;
00900		DPYSET(DPYBUF);	AIVECT(-500,-500);
01000		AVECT(+500,-500);	AVECT(+500,+500);
01100		AVECT(-500,+500);	AVECT(-500,-500);
01200	
01300		AIVECT(-500,0);AVECT(+500,0);
01400		AIVECT(0,-500);AVECT(0,+500);
01500	
01600		AIVECT(-400,-400);
01700		AVECT(+400,-400);	AVECT(+400,+400);
01800		AVECT(-400,+400);	AVECT(-400,-400);
     

00100		J ← 0;
00200		FOR X ← -1 STEP 0.02 UNTIL +1.01 DO
00300	BEGIN
00400		Y ← ((1.0*X + 0.2)*X - 0.5)*X + 0.05;
00500		IF X=-1 THEN AIVECT(X*400,Y*350) ELSE AVECT(X*400,Y*350);
00600		IX ← 1024*(XXX[J] ← X + 0.3*(RANDOM-0.5));
00700		IY ← 1024*(YYY[J] ← Y + 0.8*(RANDOM-0.5));
00800		S⊂ MOVE 13,IX;HRL 13,IY;MOVEM 13,IX ⊃;
00900		ZZZ[J] ← IX; J←J+1;
01100	END;	J←J-1;
01200		FOR I←0 TO J DO
01300	BEGIN
01400		AIVECT(XXX[I]*400-12,YYY[I]*350-9);
01500		DPYSST("o");
01600	END;
01800		CUBFIT(ZZZ,XXX,J);
01900		FOR X←-1 STEP 0.2 UNTIL +1.01 DO
02000	BEGIN	Y ← ((XXX[0]*X + XXX[1])*X + XXX[2])*X + XXX[3];
02100		IF X=-1 THEN AIVECT(Y*400,X*350)ELSE AVECT(Y*400,X*350);
02200	END;
02210		DPYOUT(0);
02300		FOR I←1 TO 30 DO OUTSTR(↓);
02400	 	WHILE TRUE DO INCHRW;
02500	END;