# Is atan2 the same as arctan?

## Is atan2 the same as arctan?

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.

What is the difference between atan and atan2 in C++?

Conclusion: atan(y/x) is held back some information and can only assume that the input came from quadrants I or IV. In contrast, atan2(y,x) gets all the data and thus can resolve the correct angle.

### What is atan2?

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.

What is atan2 vs atan?

The atan() and atan2() functions calculate the arctangent of x and y/x , respectively. 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.

#### Why is atan2 used?

ATAN2(y,x) returns the arc tangent of the two numbers x and y. It is similar to calculating the arc tangent of y / x, except that the signs of both arguments are used to determine the quadrant of the result. The result is an angle expressed in radians. To convert from radians to degrees, use the DEGREES function.

Why do we need atan2?

The atan function simply computes the inverse tangens of a value. The atan2 function takes two values (y and x). This function is used to convert from cartesian coordinates (x,y) to polar coordinates (r,phi), where phi=atan(y,x).

## Why do we use atan2?

The atan function simply computes the inverse tangens of a value. The atan2 function takes two values (y and x). This function is used to convert from cartesian coordinates (x,y) to polar coordinates (r,phi), where phi=atan(y,x). If you type the commands ‘help atan’ & ‘help atan2’, you get quick replies!

What’s the difference between Atan and atan2?

Join ResearchGate to ask questions, get input, and advance your work. atan is the general form of inverse tangent that gets a value and returns the associated angle in radian. But atan2 gets two values of y and x and assumes a complex number as x + iy and returns its phase.

### What is the range of the arctan function atan2?

In terms of the standard arctan function, whose range is (−π/2, π/2), it can be expressed as follows: The following expression derived from the tangent half-angle formula can also be used to define atan2 : This expression may be more suited for symbolic use than the definition above.

When to use Atan or atan2 for inverse tangent?

If you are working in a 2-dimensional coordinate system, which is often the case for programming the inverse tangent, you should use definitely use atan2. It will give the full 2 pi range of angles and take care of zeros in the x coordinate for you. Another way of saying this is that atan (y/x) is virtually always wrong.

#### Can you use Atan to determine a quadrant?

You cannot use atan2 to determine the quadrant, you can use atan2 only if you already know which quadrant your in! In particular positive x and y imply the first quadrant, positive y and negative x, the second and so on. atan or atan2 themselves simply return a positive or a negative number, nothing more.