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37 lines
767 B
Plaintext
37 lines
767 B
Plaintext
NAME
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atan2 - angle to point
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SYNOPSIS
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atan2(y, x, [,acc])
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TYPES
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y real
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x real
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acc real
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return real
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DESCRIPTION
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Return the angle which is determined by the point (x,y). This
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function computes the arctangent of y/x in the range [-pi, pi].
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The value acc specifies the accuracy of the result. By default, acc
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is epsilon().
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Note that by convention, y is the first argument.
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To conform to the 4.3BSD ANSI/IEEE 754-1985 math lib, atan2(0,0) is
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defined to return 0.
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EXAMPLE
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> print atan2(0,0), atan2(1,sqrt(3)), atan2(17,53,1e-100)
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0 ~.52359877559829887307 ~.31038740713235146535
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LIMITS
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acc > 0
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LIBRARY
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NUMBER *qatan2(NUMBER *y, *x, *acc)
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SEE ALSO
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acos, asin, atan, cos, epsilon, sin, tan
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