iDevOS CALC "ATAN2" Command

Get the "two argument" arc (inverse) tangent.

Description

CALC( y, a, b, "ATAN2" );   // y = atan2(a, b) = arc tangent of a and b

This command returns the angle y as the arc tangent (or inverse tangent) of aand b.

The angle y by default is specified in Degrees. Angles used in trigonometric functions can be set globally to use Radians by the SYSTEM.angles property.

Note: The values passed into the trigonometric function (a and b) must not be 0 otherwise a system error will be generated. It is the responsibility of the user to check this.

Trigonometric functions: "COS", "SIN", "TAN", "ACOS", "ASIN", "ATAN", "ATAN2", "COSH", "SINH", "TANH", "ACOSH", "ASINH", "ATANH".

Parameters

y

Calculation result.
Parameter type: entity name of a numeric variable (eg U8, S32, FLT3 etc).

a and b

Input values.
Parameter type: immediate number, or entity name of a numeric variable (eg U8, S32, FLT3 etc).

"ATAN2"

CALC command operator.
Parameter type: immediate string.

Examples

Example 1

VAR(df, 0.0,    FLT4);  // result
VAR(af, 3.5355, FLT4);  // value
VAR(bf, 5,      FLT4);  // divider

CALC(df, af, bf, "ATAN2" ); // df = 35.2641