444 lines
8.6 KiB
Modula-2
444 lines
8.6 KiB
Modula-2
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IMPLEMENTATION MODULE Mathlib;
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FROM FIFFEF IMPORT FIF, FEF;
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(* From: Handbook of Mathematical Functions
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Edited by M. Abramowitz and I.A. Stegun
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National Bureau of Standards
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Applied Mathematics Series 55
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*)
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CONST
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OneRadianInDegrees = 57.295779513082320876798155D;
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OneDegreeInRadians = 0.017453292519943295769237D;
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(* basic functions *)
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PROCEDURE pow(x: REAL; i: INTEGER): REAL;
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BEGIN
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RETURN SHORT(longpow(LONG(x), i));
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END pow;
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PROCEDURE longpow(x: LONGREAL; i: INTEGER): LONGREAL;
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VAR
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val: LONGREAL;
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ri: LONGREAL;
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BEGIN
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ri := FLOATD(i);
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IF x < 0.0D THEN
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val := longexp(longln(-x) * ri);
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IF ODD(i) THEN RETURN -val;
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ELSE RETURN val;
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END;
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ELSIF x = 0.0D THEN
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RETURN 0.0D;
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ELSE
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RETURN longexp(longln(x) * ri);
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END;
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END longpow;
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PROCEDURE sqrt(x: REAL): REAL;
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BEGIN
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RETURN SHORT(longsqrt(LONG(x)));
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END sqrt;
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PROCEDURE longsqrt(x: LONGREAL): LONGREAL;
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VAR
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temp: LONGREAL;
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exp, i: INTEGER;
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BEGIN
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IF x <= 0.0D THEN
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IF x < 0.0D THEN
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(* ??? *)
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;
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END;
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RETURN 0.0D;
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END;
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temp := FEF(x,exp);
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(*
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* NOTE
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* this wont work on 1's comp
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*)
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IF ODD(exp) THEN
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temp := 2.0D * temp;
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DEC(exp);
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END;
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temp := 0.5D*(1.0D + temp);
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WHILE exp > 28 DO
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temp := temp * 16384.0D;
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exp := exp - 28;
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END;
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WHILE exp < -28 DO
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temp := temp / 16384.0D;
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exp := exp + 28;
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END;
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WHILE exp >= 2 DO
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temp := temp * 2.0D;
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exp := exp - 2;
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END;
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WHILE exp <= -2 DO
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temp := temp / 2.0D;
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exp := exp + 2;
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END;
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FOR i := 0 TO 4 DO
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temp := 0.5D*(temp + x/temp);
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END;
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RETURN temp;
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END longsqrt;
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PROCEDURE exp(x: REAL): REAL;
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BEGIN
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RETURN SHORT(longexp(LONG(x)));
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END exp;
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PROCEDURE longexp(x: LONGREAL): LONGREAL;
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(*
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* n = floor(x / ln2), d = x / ln2 - n
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* exp(x) = exp((x / ln2) * ln2) = exp((n + d) * ln2) =
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* exp(n * ln2) * exp(d * ln2) = 2 ** n * exp(d * ln2)
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*)
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CONST
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a1 = -0.9999999995D;
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a2 = 0.4999999206D;
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a3 = -0.1666653019D;
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a4 = 0.0416573475D;
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a5 = -0.0083013598D;
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a6 = 0.0013298820D;
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a7 = -0.0001413161D;
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VAR
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neg: BOOLEAN;
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polval: LONGREAL;
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n: LONGREAL;
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n1 : INTEGER;
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BEGIN
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neg := x < 0.0D;
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IF neg THEN
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x := -x;
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END;
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x := FIF(x, 1.0D/LONG(ln2), n) * LONG(ln2);
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polval := 1.0D /(1.0D + x*(a1+x*(a2+x*(a3+x*(a4+x*(a5+x*(a6+x*a7)))))));
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n1 := TRUNCD(n + 0.5D);
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WHILE n1 >= 16 DO
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polval := polval * 65536.0D;
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n1 := n1 - 16;
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END;
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WHILE n1 > 0 DO
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polval := polval * 2.0D;
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DEC(n1);
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END;
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IF neg THEN RETURN 1.0D/polval; END;
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RETURN polval;
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END longexp;
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PROCEDURE ln(x: REAL): REAL; (* natural log *)
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BEGIN
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RETURN SHORT(longln(LONG(x)));
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END ln;
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PROCEDURE longln(x: LONGREAL): LONGREAL; (* natural log *)
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CONST
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a1 = 0.9999964239D;
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a2 = -0.4998741238D;
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a3 = 0.3317990258D;
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a4 = -0.2407338084D;
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a5 = 0.1676540711D;
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a6 = -0.0953293897D;
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a7 = 0.0360884937D;
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a8 = -0.0064535442D;
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VAR
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exp: INTEGER;
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polval: LONGREAL;
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BEGIN
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IF x <= 0.0D THEN
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(* ??? *)
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RETURN 0.0D;
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END;
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x := FEF(x, exp);
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WHILE x < 1.0D DO
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x := x + x;
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DEC(exp);
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END;
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x := x - 1.0D;
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polval := x*(a1+x*(a2+x*(a3+x*(a4+x*(a5+x*(a6+x*(a7+a8*x)))))));
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RETURN polval + FLOATD(exp) * LONG(ln2);
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END longln;
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PROCEDURE log(x: REAL): REAL; (* log with base 10 *)
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BEGIN
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RETURN SHORT(longlog(LONG(x)));
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END log;
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PROCEDURE longlog(x: LONGREAL): LONGREAL; (* log with base 10 *)
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BEGIN
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RETURN longln(x)/LONG(ln10);
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END longlog;
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(* trigonometric functions; arguments in radians *)
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PROCEDURE sin(x: REAL): REAL;
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BEGIN
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RETURN SHORT(longsin(LONG(x)));
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END sin;
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PROCEDURE longsin(x: LONGREAL): LONGREAL;
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CONST
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a2 = -0.1666666664D;
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a4 = 0.0083333315D;
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a6 = -0.0001984090D;
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a8 = 0.0000027526D;
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a10 = -0.0000000239D;
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VAR
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xsqr: LONGREAL;
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neg: BOOLEAN;
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BEGIN
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neg := FALSE;
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IF x < 0.0D THEN
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neg := TRUE;
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x := -x;
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END;
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x := FIF(x, 1.0D / LONG(twicepi), (* dummy *) xsqr) * LONG(twicepi);
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IF x >= LONG(pi) THEN
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neg := NOT neg;
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x := x - LONG(pi);
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END;
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IF x > LONG(halfpi) THEN
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x := LONG(pi) - x;
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END;
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xsqr := x * x;
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x := x * (1.0D + xsqr*(a2+xsqr*(a4+xsqr*(a6+xsqr*(a8+xsqr*a10)))));
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IF neg THEN RETURN -x; END;
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RETURN x;
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END longsin;
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PROCEDURE cos(x: REAL): REAL;
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BEGIN
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RETURN SHORT(longcos(LONG(x)));
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END cos;
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PROCEDURE longcos(x: LONGREAL): LONGREAL;
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CONST
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a2 = -0.4999999963D;
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a4 = 0.0416666418D;
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a6 = -0.0013888397D;
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a8 = 0.0000247609D;
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a10 = -0.0000002605D;
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VAR
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xsqr: LONGREAL;
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neg: BOOLEAN;
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BEGIN
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neg := FALSE;
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IF x < 0.0D THEN x := -x; END;
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x := FIF(x, 1.0D / LONG(twicepi), (* dummy *) xsqr) * LONG(twicepi);
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IF x >= LONG(pi) THEN
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x := LONG(twicepi) - x;
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END;
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IF x > LONG(halfpi) THEN
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neg := NOT neg;
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x := LONG(pi) - x;
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END;
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xsqr := x * x;
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x := 1.0D + xsqr*(a2+xsqr*(a4+xsqr*(a6+xsqr*(a8+xsqr*a10))));
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IF neg THEN RETURN -x; END;
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RETURN x;
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END longcos;
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PROCEDURE tan(x: REAL): REAL;
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BEGIN
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RETURN SHORT(longtan(LONG(x)));
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END tan;
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PROCEDURE longtan(x: LONGREAL): LONGREAL;
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VAR cosinus: LONGREAL;
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BEGIN
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cosinus := longcos(x);
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IF cosinus = 0.0D THEN
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(* ??? *)
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RETURN 0.0D;
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END;
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RETURN longsin(x)/cosinus;
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END longtan;
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PROCEDURE arcsin(x: REAL): REAL;
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BEGIN
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RETURN SHORT(longarcsin(LONG(x)));
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END arcsin;
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PROCEDURE longarcsin(x: LONGREAL): LONGREAL;
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CONST
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a0 = 1.5707963050D;
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a1 = -0.2145988016D;
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a2 = 0.0889789874D;
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a3 = -0.0501743046D;
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a4 = 0.0308918810D;
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a5 = -0.0170881256D;
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a6 = 0.0066700901D;
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a7 = -0.0012624911D;
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BEGIN
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IF x < 0.0D THEN x := -x; END;
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IF x > 1.0D THEN
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(* ??? *)
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RETURN 0.0D;
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END;
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RETURN LONG(halfpi) -
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longsqrt(1.0D - x)*(a0+x*(a1+x*(a2+x*(a3+x*(a4+x*(a5+x*(a6+x*a7)))))));
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END longarcsin;
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PROCEDURE arccos(x: REAL): REAL;
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BEGIN
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RETURN SHORT(longarccos(LONG(x)));
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END arccos;
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PROCEDURE longarccos(x: LONGREAL): LONGREAL;
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BEGIN
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RETURN LONG(halfpi) - longarcsin(x);
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END longarccos;
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PROCEDURE arctan(x: REAL): REAL;
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BEGIN
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RETURN SHORT(longarctan(LONG(x)));
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END arctan;
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PROCEDURE longarctan(x: LONGREAL): LONGREAL;
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CONST
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a2 = -0.3333314528D;
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a4 = 0.1999355085D;
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a6 = -0.1420889944D;
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a8 = 0.1065626393D;
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a10 = -0.0752896400D;
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a12 = 0.0429096318D;
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a14 = -0.0161657367D;
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a16 = 0.0028662257D;
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VAR
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xsqr: LONGREAL;
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rev: BOOLEAN;
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neg: BOOLEAN;
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BEGIN
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rev := FALSE;
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neg := FALSE;
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IF x < 0.0D THEN
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neg := TRUE;
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x := -x;
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END;
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IF x > 1.0D THEN
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rev := TRUE;
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x := 1.0D / x;
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END;
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xsqr := x * x;
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x := x * (1.0D + xsqr*(a2+xsqr*(a4+xsqr*(a6+xsqr*(a8+xsqr*(a10+xsqr*(a12+xsqr*(a14+xsqr*a16))))))));
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IF rev THEN
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x := LONG(quartpi) - x;
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END;
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IF neg THEN RETURN -x; END;
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RETURN x;
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END longarctan;
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(* hyperbolic functions *)
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PROCEDURE sinh(x: REAL): REAL;
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BEGIN
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RETURN SHORT(longsinh(LONG(x)));
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END sinh;
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PROCEDURE longsinh(x: LONGREAL): LONGREAL;
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VAR expx: LONGREAL;
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BEGIN
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expx := longexp(x);
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RETURN (expx - 1.0D/expx)/2.0D;
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END longsinh;
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PROCEDURE cosh(x: REAL): REAL;
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BEGIN
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RETURN SHORT(longcosh(LONG(x)));
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END cosh;
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PROCEDURE longcosh(x: LONGREAL): LONGREAL;
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VAR expx: LONGREAL;
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BEGIN
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expx := longexp(x);
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RETURN (expx + 1.0D/expx)/2.0D;
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END longcosh;
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PROCEDURE tanh(x: REAL): REAL;
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BEGIN
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RETURN SHORT(longtanh(LONG(x)));
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END tanh;
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PROCEDURE longtanh(x: LONGREAL): LONGREAL;
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VAR expx: LONGREAL;
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BEGIN
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expx := longexp(x);
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RETURN (expx - 1.0D/expx) / (expx + 1.0D/expx);
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END longtanh;
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PROCEDURE arcsinh(x: REAL): REAL;
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BEGIN
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RETURN SHORT(longarcsinh(LONG(x)));
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END arcsinh;
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PROCEDURE longarcsinh(x: LONGREAL): LONGREAL;
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VAR neg: BOOLEAN;
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BEGIN
|
||
|
|
neg := FALSE;
|
||
|
|
IF x < 0.0D THEN
|
||
|
|
neg := TRUE;
|
||
|
|
x := -x;
|
||
|
|
END;
|
||
|
|
x := longln(x + longsqrt(x*x+1.0D));
|
||
|
|
IF neg THEN RETURN -x; END;
|
||
|
|
RETURN x;
|
||
|
|
END longarcsinh;
|
||
|
|
|
||
|
|
PROCEDURE arccosh(x: REAL): REAL;
|
||
|
|
BEGIN
|
||
|
|
RETURN SHORT(longarccosh(LONG(x)));
|
||
|
|
END arccosh;
|
||
|
|
|
||
|
|
PROCEDURE longarccosh(x: LONGREAL): LONGREAL;
|
||
|
|
BEGIN
|
||
|
|
IF x < 1.0D THEN
|
||
|
|
(* ??? *)
|
||
|
|
RETURN 0.0D;
|
||
|
|
END;
|
||
|
|
RETURN longln(x + longsqrt(x*x - 1.0D));
|
||
|
|
END longarccosh;
|
||
|
|
|
||
|
|
PROCEDURE arctanh(x: REAL): REAL;
|
||
|
|
BEGIN
|
||
|
|
RETURN SHORT(longarctanh(LONG(x)));
|
||
|
|
END arctanh;
|
||
|
|
|
||
|
|
PROCEDURE longarctanh(x: LONGREAL): LONGREAL;
|
||
|
|
BEGIN
|
||
|
|
IF (x <= -1.0D) OR (x >= 1.0D) THEN
|
||
|
|
(* ??? *)
|
||
|
|
RETURN 0.0D;
|
||
|
|
END;
|
||
|
|
RETURN longln((1.0D + x)/(1.0D - x)) / 2.0D;
|
||
|
|
END longarctanh;
|
||
|
|
|
||
|
|
(* conversions *)
|
||
|
|
|
||
|
|
PROCEDURE RadianToDegree(x: REAL): REAL;
|
||
|
|
BEGIN
|
||
|
|
RETURN SHORT(longRadianToDegree(LONG(x)));
|
||
|
|
END RadianToDegree;
|
||
|
|
|
||
|
|
PROCEDURE longRadianToDegree(x: LONGREAL): LONGREAL;
|
||
|
|
BEGIN
|
||
|
|
RETURN x * OneRadianInDegrees;
|
||
|
|
END longRadianToDegree;
|
||
|
|
|
||
|
|
PROCEDURE DegreeToRadian(x: REAL): REAL;
|
||
|
|
BEGIN
|
||
|
|
RETURN SHORT(longDegreeToRadian(LONG(x)));
|
||
|
|
END DegreeToRadian;
|
||
|
|
|
||
|
|
PROCEDURE longDegreeToRadian(x: LONGREAL): LONGREAL;
|
||
|
|
BEGIN
|
||
|
|
RETURN x * OneDegreeInRadians;
|
||
|
|
END longDegreeToRadian;
|
||
|
|
|
||
|
|
END Mathlib.
|