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Annotation of researchv10dc/630/man/src/p_man/man3/itrig.3l, revision 1.1.1.1

1.1       root        1: .TH ITRIG 3L "630 MTG"
                      2: .XE "cos()"
                      3: .XE "sin()"
                      4: .XE "atan2()"
                      5: .SH NAME
                      6: itrig: Icos, Isin, Iatan2 \- cosine, sine and arc tangent trigonometric functions
                      7: .SH SYNOPSIS
                      8: \f3
                      9: int Icos (d) 
                     10: .sp
                     11: int Isin (d)
                     12: .sp
                     13: int Iatan2 (x, y)
                     14: .sp
                     15: .br
                     16: int d;
                     17: .br
                     18: int x, y;
                     19: .SH DESCRIPTION
                     20: The
                     21: .I Icos
                     22: and
                     23: .I Isin
                     24: functions
                     25: return scaled integer approximations to the trigonometric functions.
                     26: The argument values are in degrees.
                     27: The values returned are scaled so that
                     28: .BR Icos(0)==1024 .
                     29: .PP
                     30: The
                     31: .I Iatan2
                     32: function
                     33: returns the approximate arc-tangent of
                     34: .I y/x.
                     35: The return value is in integral degrees.
                     36: The error in approximation may be as large as five degrees.
                     37: .SH EXAMPLE
                     38: These routines can be used to calculate mathematical expressions such as:
                     39: .sp
                     40: .ce
                     41: .ft CM
                     42: x=x0*Icos(d)
                     43: .sp
                     44: .ft R
                     45: or to calculate a projection: 
                     46: .sp
                     47: .ce
                     48: .ft CM
                     49: x=muldiv(x0, Icos(d), 1024)
                     50: .ft R
                     51: .sp
                     52: Note, the multiplication must be scaled.
                     53: .SH SEE ALSO
                     54: muldiv(3L).

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