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Annotation of researchv9/jtools/man/man3/cos.3, revision 1.1.1.1

1.1       root        1: .TH COS 3
                      2: .CT 2 math
                      3: .SH NAME
                      4: cos, sin, atan2, sqrt, norm \- integer math functions
                      5: .SH SYNOPSIS
                      6: .B int cos(d)
                      7: .B int d;
                      8: .PP
                      9: .B int sin(d)
                     10: .B int d;
                     11: .PP
                     12: .B int atan2(x, y)
                     13: .B int x, y;
                     14: .PP
                     15: .B int norm(x, y, z)
                     16: .B int x, y, z;
                     17: .PP
                     18: .B int sqrt(x)
                     19: .B long x;
                     20: .PP
                     21: .SH DESCRIPTION
                     22: .I Cos
                     23: and
                     24: .I sin
                     25: return scaled integer approximations to the trigonometric functions.
                     26: The argument values are in degrees.
                     27: The return values are scaled so that
                     28: .BR cos(0)==1024 .
                     29: Thus, to calculate the mathematical expression
                     30: .if t .IR x \|=\| a\^ cos( d ),
                     31: .if n .IR x = x0 *cos( d ),
                     32: the multiplication must be scaled:
                     33: .IP
                     34: .L
                     35: x = muldiv(x0, cos(d), 1024)
                     36: .PP
                     37: .I Atan2
                     38: returns the approximate arc-tangent of
                     39: .IR  y / x .
                     40: The return value is in integral degrees.
                     41: .PP
                     42: .I Sqrt
                     43: returns the 16-bit signed integer closest to the
                     44: square root of its 32-bit signed argument.
                     45: .PP
                     46: .I Norm
                     47: returns the Euclidean length of the three-vector
                     48: .RI ( x ,
                     49: .IR y ,
                     50: .IR z ).
                     51: .SH DIAGNOSTICS
                     52: .I Sqrt
                     53: returns 0 for negative arguments; and
                     54: .BR atan2(0,0)==0.
                     55: .IR Norm
                     56: does not protect against overflow.
                     57: .SH BUGS
                     58: .I Atan2
                     59: may be off by as much as two degrees.

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