# What is the difference between atan2 and atan?

Table of Contents

## What is the difference between atan2 and 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.

**What is atan2 in C++?**

The atan2() function in C++ returns the inverse tangent of a coordinate in radians. It is defined in the cmath header file. Mathematically, atan2(y, x) = tan-1(y/x) .

**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.

### What is the difference between arctan and arctan2?

Arctan2 is the 4-quadrant inverse tangent. It can get around the previous issue by taking both x and y in as separate arguments. Whereas the syntax for arctan is arctan(y/x), the syntax for arctan2 is arctan2(y,x). Knowing the signs of x and y separately can determine if the angle lies in any of the four quadrants.

**Is ATAN2 continuous?**

While the function atan2 is discontinuous along the negative x-axis, reflecting the fact that angle cannot be continuously defined, this derivative is continuously defined except at the origin, reflecting the fact that infinitesimal (and indeed local) changes in angle can be defined everywhere except the origin.

**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.

## Is atan2 Tan inverse?

Description. 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 continuous?**

**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.

### Can atan2 be negative?

**What is the opposite of ATAN2?**

As atan2 works as tan-1, so the inverse could be tan, taking into consideration conversion between radian and degree.

**What is the difference between math H and cmath in C++?**

math. h is the deprecated C header. cmath is the C++ header. The difference is that cmath puts all the names in the std namespace.

## What is atan C++?

The atan() function in C++ returns the inverse tangent of a number (argument) in radians. This function is defined in header file.

**Which is better cmath or math H?**

[cmath] defines symbols in the std namespace, and may also define symbols in the global namespace. [math. h] defines symbols in the global namespace, and may also define symbols in the std namespace. if you include the former and use an unqualified symbol, it may compile with one compiler but not with another.

**What is difference between math and cmath?**

The math module supplies mathematical functions on floating-point numbers, while the cmath module supplies equivalent functions on complex numbers. For example, math. sqrt(-1) raises an exception, but cmath.

### Is math H and cmath same?

**What is the difference between Atan and atan2 in C++?**

What is the difference between atan and atan2 in C++? std::atan2 allows calculating the arctangent of all four quadrants. std::atan only allows calculating from quadrants 1 and 4. and we differentiate between four quadrants based on the angle that we supply to the functions.

**What is the result of atan2 ()?**

The result is between -pi and pi. The vector in the plane from the origin to point (x, y) makes this angle with the positive X axis. The point of atan2 () is that the signs of both inputs are known to it, so it can compute the correct quadrant for the angle.

## What is the use of atan2 in MySQL?

ATAN2 () Function : ATAN2 () function in MySQL is used for return the arc tangent between specified two number, i.e., x and y. It returns the angle between the positive x-axis and the line from the origin to the point (y, x).

**What is the value of Atan in degrees?**

The actual values are in radians but to interpret them in degrees it will be: atan = gives angle value between -90 and 90 atan2 = gives angle value between -180 and 180