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Returns the arc tangent in all four quadrants from specified values.
ATN2(nYCoordinate, nXCoordinate) |
Parameters
- nYCoordinate
- Specifies the y coordinate.
- nXCoordinate
- Specifies the x coordinate.
Return Value
Numeric
Remarks
ATN2(В ) returns the angle (in radians) between the line y = 0 and the line connecting the specified coordinates and the origin (0, 0) of the coordinate system.
ATN2( ) returns a value between – pi/2 and +pi/2.
You can convert the value returned by ATN2(В ) to degrees with RTOD(В ). You can specify the number of decimal places that are displayed in the result with SET DECIMALS.
Example
| В |  Copy Code |
|---|---|
CLEAR ? PI( ) && Displays 3.14 ? ATN2(0,-1) && Displays 3.14 STORE COS(PI( )) TO gnXCoord STORE SIN(PI( )) TO gnYCoord ? ATN2(gnYCoord,gnXCoord) && Displays 3.14 ? ATN2(gnYCoord,gnXCoord)/PI( ) && Displays 1.00 | |