Topic: DMD0089

ATAN - Arctangent in Radians

This instruction can only be used in the Expression parameter of the Calculate Expression (MATH) instruction.

The Arctangent in Radians (ATAN) function will compute the inverse tangent of the function expression.

The expression parameter consists of all the text between the bounding parentheses. Any expression parameter can be a constant value, a bit or numeric memory location, an arithmetic expression, and/or mathematical function or other expressions up to a maximum of 1024 characters. Expressions can be nested, so use of parentheses is recommended to ensure proper evaluation order.

The range of acceptable input values in any real or integer number.

The output value will be in the range of -1.570796 to +1.570796 (-π/2 to π/2).

Some examples:

ATAN( 0.0 ) = 0.0

ATAN( 1.0 ) = π/4

ATAN( -1.0 ) = -π/4

If the result needs to be in degrees, use the DEG function on the resulting function, for example, DEG( ATAN( +1.0 ) ) = 45.0 degrees

See Also:

• COS - Cosine of Radian Angle

• SIN - Sine of Radian Angle

• TAN - Tangent of Radian Angle
   

• ACOS - Arccosine in Radians

• ASIN - Arcsine in Radians

• ATAN - Arctangent in Radians

Related Topics:

• MATH - Calculate Expression
   

• DEG - Convert Radians to Degrees
   

• RAD - Convert Degrees to Radians

Rung Example: