Returns in radians the arc tangent of a numeric expression.

ATAN(nExpression)

Parameters

nExpression

Specifies a numeric expression whose arc tangent ATAN( ) returns. nExpression can be any value. The value returned by ATAN( ) can range from –pi/2 through +pi/2 (–1.57079 to 1.57079). The number of decimal places displayed in the value returned by ATAN( ) is determined by SET DECIMALS.

Return Value

Remarks

Example

	Copy Code
CLEAR ? ATAN(0) && Displays 0.00 STORE PI( )/2 to gnAngle ? ATAN(gnAngle) && Displays 1.00 ? ATAN(PI( )/2) && Displays 1.00 ? ATAN(DTOR(90)) && Displays 1.00

See Also

Reference

SIN( ) Function
ASIN( ) Function
COS( ) Function
ACOS( ) Function
TAN( ) Function
ATN2( ) Function
DTOR( ) Function
RTOD( ) Function
PI( ) Function
SET DECIMALS Command

Concepts

Creating Numeric Expressions

Other Resources

Functions
Language Reference (Visual FoxPro)