Campbell CR800 Specifikace stáhnout pdf (Strana 207)

Section 8. Processing and Math Instructions

Atn FunctionExample

The example uses Atn to calculate π. By definition, a full circle is 2π radians.

Atn(1) is π/4 radians (45 degrees).

Dim Pi 'Declare variables.

Pi = 4 * Atn(1) 'Calculate Pi.

ATN2()

The ATN2 function returns the arctangent of y/x.

Syntax

x = ATN2 ( Y, X )

Remarks

ATN2 function calculates the arctangent of Y/X returning a value in the range

from Pi to -Pi radians, using the signs of both parameters to determine the

quadrant of the return value. ATN2 is defined for every point other than the

origin (X = 0 and Y = 0). Y and X can be variables, constants, or expressions.

To convert degrees to radians, multiply degrees by π/180. To convert radians

to degrees, multiply radians by 180/π.

Pi/2

-Pi/2

-x

-y

ATN2 is the inverse trigonometric function of TAN, which takes an angle as

its argument and returns the ratio of two sides of a right triangle. Do not

confuse ATN2 with the cotangent, which is the simple inverse of a tangent

(1/tangent).

ATN2 Function Example

The example uses ATN2 to calculate π. By definition, a full circle is 2π

radians. ATN2(1,1) is π/4 radians (45 degrees).

Dim Pi 'Declare variables.

Pi = 4 * ATN2( 5, 5 ) 'Calculate Pi.

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Campbell CR800 Specifikace Strana 207