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GeoB
ASIC
Reference Manual 5.Standard Functions
TPS1100-Version 1.30 5-17
5.5.3 Atn Function
Description Returns the arcs tangent of a number.
Declaration
Atn( dAngle AS Double ) AS Double
Remarks The argument
dAngle
can be any valid numeric expression. The
return type of
Atn
is
Double
.
The
Atn
function takes the ratio (a floating point number) of two
sides of a right triangle and returns the corresponding angle. The
ratio is the length of the side opposite to the angle divided by the
length of the side adjacent to the angle. (The hypotenuse is not
involved.)
The result's unit is radians. It is in the floating point range
− π
2
to
π
2
.
Note
Atn
is the inverse trigonometric function of
Tan
. Do not
confuse arcus tangent with the cotangent, which is simply
the multiplicative inverse of a tangent (i.e.
1
Tan
).
See Also
Cos, Sin, Tan
Remark on the Conversion of Angles (5.5.2)
Example The example uses
Atn
to compute Pi. By definition,
Atn(1)
is
π
4
radians (that equals 50 grad or 45 degrees).
DIM dMyPi AS Double ' Declare variables.
dMyPi = 4 * Atn(1) ' Calculate Pi.
WRITE "Pi is equal to " + str$(dMyPi)