3 * Circular sine of angle in degrees
9 * double x, y, sindg();
17 * Range reduction is into intervals of 45 degrees.
19 * Two polynomial approximating functions are employed.
20 * Between 0 and pi/4 the sine is approximated by
22 * Between pi/4 and pi/2 the cosine is represented as
30 * arithmetic domain # trials peak rms
31 * DEC +-1000 3100 3.3e-17 9.0e-18
32 * IEEE +-1000 30000 2.3e-16 5.6e-17
36 * message condition value returned
37 * sindg total loss x > 8.0e14 (DEC) 0.0
43 * Circular cosine of angle in degrees
49 * double x, y, cosdg();
57 * Range reduction is into intervals of 45 degrees.
59 * Two polynomial approximating functions are employed.
60 * Between 0 and pi/4 the cosine is approximated by
62 * Between pi/4 and pi/2 the sine is represented as
69 * arithmetic domain # trials peak rms
70 * DEC +-1000 3400 3.5e-17 9.1e-18
71 * IEEE +-1000 30000 2.1e-16 5.7e-17
76 /* Cephes Math Library Release 2.0: April, 1987
77 * Copyright 1985, 1987 by Stephen L. Moshier
78 * Direct inquiries to 30 Frost Street, Cambridge, MA 02140 */
83 static double sincof[] = {
84 1.58962301572218447952E-10,
85 -2.50507477628503540135E-8,
86 2.75573136213856773549E-6,
87 -1.98412698295895384658E-4,
88 8.33333333332211858862E-3,
89 -1.66666666666666307295E-1
91 static double coscof[] = {
92 1.13678171382044553091E-11,
93 -2.08758833757683644217E-9,
94 2.75573155429816611547E-7,
95 -2.48015872936186303776E-5,
96 1.38888888888806666760E-3,
97 -4.16666666666666348141E-2,
98 4.99999999999999999798E-1
100 static double PI180 = 1.74532925199432957692E-2; /* pi/180 */
101 static double lossth = 1.0e14;
105 static unsigned short sincof[] = {
106 0030056,0143750,0177170,0073013,
107 0131727,0027455,0044510,0132205,
108 0033470,0167432,0131752,0042263,
109 0135120,0006400,0146776,0174027,
110 0036410,0104210,0104207,0137202,
111 0137452,0125252,0125252,0125103
113 static unsigned short coscof[] = {
114 0027107,0176030,0153315,0110312,
115 0131017,0072476,0007450,0123243,
116 0032623,0171174,0070066,0146445,
117 0134320,0006400,0147355,0163313,
118 0035666,0005540,0133012,0165067,
119 0137052,0125252,0125252,0125206,
120 0040000,0000000,0000000,0000000
122 static unsigned short P1[] = {0036616,0175065,0011224,0164711};
123 #define PI180 *(double *)P1
124 static double lossth = 8.0e14;
128 static unsigned short sincof[] = {
129 0x0ec1,0x1fcf,0xd8fd,0x3de5,
130 0x1691,0xa929,0xe5e5,0xbe5a,
131 0x4896,0x567d,0x1de3,0x3ec7,
132 0xdf03,0x19bf,0x01a0,0xbf2a,
133 0xf7d0,0x1110,0x1111,0x3f81,
134 0x5548,0x5555,0x5555,0xbfc5
136 static unsigned short coscof[] = {
137 0xb219,0x1ad9,0xff83,0x3da8,
138 0x14d4,0xc1e5,0xeea7,0xbe21,
139 0xd9a5,0x8e06,0x7e4f,0x3e92,
140 0xbcd9,0x19dd,0x01a0,0xbefa,
141 0x5d47,0x16c1,0xc16c,0x3f56,
142 0x5551,0x5555,0x5555,0xbfa5,
143 0x0000,0x0000,0x0000,0x3fe0
146 static unsigned short P1[] = {0x9d39,0xa252,0xdf46,0x3f91};
147 #define PI180 *(double *)P1
148 static double lossth = 1.0e14;
152 static unsigned short sincof[] = {
153 0x3de5,0xd8fd,0x1fcf,0x0ec1,
154 0xbe5a,0xe5e5,0xa929,0x1691,
155 0x3ec7,0x1de3,0x567d,0x4896,
156 0xbf2a,0x01a0,0x19bf,0xdf03,
157 0x3f81,0x1111,0x1110,0xf7d0,
158 0xbfc5,0x5555,0x5555,0x5548
160 static unsigned short coscof[] = {
161 0x3da8,0xff83,0x1ad9,0xb219,
162 0xbe21,0xeea7,0xc1e5,0x14d4,
163 0x3e92,0x7e4f,0x8e06,0xd9a5,
164 0xbefa,0x01a0,0x19dd,0xbcd9,
165 0x3f56,0xc16c,0x16c1,0x5d47,
166 0xbfa5,0x5555,0x5555,0x5551,
167 0x3fe0,0x0000,0x0000,0x0000
170 static unsigned short P1[] = {
171 0x3f91,0xdf46,0xa252,0x9d39
173 #define PI180 *(double *)P1
174 static double lossth = 1.0e14;
178 extern double polevl ( double, void *, int );
179 extern double floor ( double );
180 extern double ldexp ( double, int );
182 double polevl(), floor(), ldexp();
192 /* make argument positive but save the sign */
202 mtherr( "sindg", TLOSS );
206 y = floor( x/45.0 ); /* integer part of x/PIO4 */
208 /* strip high bits of integer part to prevent integer overflow */
210 z = floor(z); /* integer part of y/8 */
211 z = y - ldexp( z, 4 ); /* y - 16 * (y/16) */
213 j = z; /* convert to integer for tests on the phase angle */
214 /* map zeros to origin */
220 j = j & 07; /* octant modulo 360 degrees */
221 /* reflect in x axis */
228 z = x - y * 45.0; /* x mod 45 degrees */
229 z *= PI180; /* multiply by pi/180 to convert to radians */
232 if( (j==1) || (j==2) )
234 y = 1.0 - zz * polevl( zz, coscof, 6 );
238 y = z + z * (zz * polevl( zz, sincof, 5 ));
257 /* make argument positive */
264 mtherr( "cosdg", TLOSS );
270 z = floor(z); /* integer part of y/8 */
271 z = y - ldexp( z, 4 ); /* y - 16 * (y/16) */
273 /* integer and fractional part modulo one octant */
275 if( j & 1 ) /* map zeros to origin */
290 z = x - y * 45.0; /* x mod 45 degrees */
291 z *= PI180; /* multiply by pi/180 to convert to radians */
295 if( (j==1) || (j==2) )
297 y = z + z * (zz * polevl( zz, sincof, 5 ));
301 y = 1.0 - zz * polevl( zz, coscof, 6 );