# What is atan2 in excel

## What is ATAN2 used for?

atan2() function

**returns the angle in the plane (in radians) between the positive x-axis and the ray**from (0,0) to the point (x,y), for Math.## How is ATAN2 calculated?

The atan2 function calculates

**one unique arc tangent value from two variables y and x**, where the signs of both arguments are used to determine the quadrant of the result, thereby selecting the desired branch of the arc tangent of y/x, e.g., atan2(1, 1) = π/4 and atan2(−1, −1) = −3π/4.## What is the difference between atan and ATAN2 in Excel?

Difference Between ATAN and ATAN2

For points in the second and third quadrants of the coordinate system, the ATAN function **will return the angle relative to the negative x-axis direction**. The ATAN2 function, by comparison, returns the angle relative to the positive x-axis which is the standard for measuring angles.

## What is atan and ATAN2?

Description. The atan() and atan2() functions calculate the arctangent of x and y/x , respectively. Return Value. The atan() function returns a value in the range -π/2 to π/2 radians. The atan2() function returns a value in the range -π to π radians.

## Does atan2 return radians or degrees?

The Math. atan2() method returns the arctangent of the quotient of its arguments, as a numeric value between PI

**and -PI radians**. The number returned represents the counterclockwise angle in radians (not degrees) between the positive X axis and the point (x, y).## What is the inverse of atan2?

**P = atan2( Y , X )**returns the four-quadrant inverse tangent (tan

^{–}

^{1}) of Y and X , which must be real. The atan2 function follows the convention that atan2(x,x) returns 0 when x is mathematically zero (either 0 or -0 ).

## Is atan2 better than atan?

In conclusion, if you are calculating something that ranges between -90 and 90 degrees like latitude, use

**arctan**. If calculating an angle that can be between -180 and 180 degrees, use arctan2.## Can atan2 be negative?

A positive result represents a counterclockwise angle from the x-axis; a negative result represents a

**clockwise angle**. ATAN2(a,b) equals ATAN(b/a), except that a can equal 0 in ATAN2.## What is atan2 Matlab?

atan2( Y , X )

**computes the four-quadrant inverse tangent (arctangent) of Y and X**. If Y and X are vectors or matrices, atan2 computes arctangents element by element.