Brave Search

Java Examples Java Videos Java Compiler Java Exercises Java Quiz Java Code Challenges Java Server Java Syllabus Java Study Plan Java Interview Q&A Java Certificate ... System.out.println(Math.atan2(0.5, 0.5)); System.out.println(Math.atan2(-0.5, -0.5)); System.out.println(Math.atan2(5, 5)); System.out.println(Math.atan2(10, 20)); System.out.println(Math.atan2(-5, -5)); System.out.println(Math.atan2(-10, 10));

Oracle

docs.oracle.com › javase › 8 › docs › api › java › lang › Math.html

Math (Java Platform SE 8 )

1 week ago - the closest floating-point value to a that is equal to a mathematical integer. public static double atan2(double y, double x) Returns the angle theta from the conversion of rectangular coordinates (x, y) to polar coordinates (r, theta). This method computes the phase theta by computing an arc ...

Java Guides

javaguides.net › 2024 › 06 › java-math-atan2-method.html

Java Math atan2() Method

June 24, 2024 - The Math.atan2() method in Java provides a way to calculate the angle between the positive x-axis and the point given by the coordinates (x, y) in the Cartesian plane.

reddit.com › r/learnjava › how does math.atan2 work?

r/learnjava on Reddit: How does Math.atan2 work?

February 24, 2021 -

I've been calculating rotation needed between two 3d points, and I'm having some slight trouble.

You can use very basic sohcahtoa to find the angle needed between the two points by making a right triangle and just doing arctan of opposite/adjacent (the two sides). Now this only works if all of the values are positive, as, for example, arctan(-5/-4) == arctan(5/4). I do remember learning something about fixing this back when I learned about trig identities in school, and how to fix it, but my friend sent me some code, and he used Math.atan2 instead of tangent.

Now his code works perfectly, and was not too different from mine, and it really made me wonder what Math.atan2 does. I searched up on the internet, and didn't understand a word of the descriptions. Can someone show me what Math.atan2 is in normal math writing?

Top answer

1 of 2

if I understood right this method returns result in radians. Like angle of 0 degrees is 0, angle of 180 is 3,14... This supposed to help you to convert coordinates from cartesian system (x, y) to polar coordinates (radius, angle) it can be really helpful in some cases. So that for point (0, 90) polar representation is like (90, 1.57) For some reason atan2 method gets arguments in reversed manner. Y then X.

2 of 2

Check the Wikipedia page for all the normal math writing you could want. The problem with atan is its range -90 to 90 degrees (-pi/2 to pi/2 radians), which causes duplication > 90 degrees and < 270 degrees, which you have to correct for using sign checks on the input arguments (adding or subtracting pi from the result). Also, since atan takes a single argument (the ratio y / x), it doesn't work at 90 degrees/270 degrees (x is zero), so you have to check the x value to determine if the angle is -pi/2 or pi/2. As you can see from the Wikipedia article, atan2 is defined in terms of atan, takes the y and x values, and does all the checks for you.

PREP INSTA

prepinsta.com › home › java tutorial › java math atan2() method

Java Math atan2() Method | Prepinsta

May 26, 2023 - Java Math atan2() Method Returns the angle theta from the conversion of rectangular coordinates (x, y) to polar coordinates (r, theta).

ClojureDocs

clojuredocs.org › clojure.math › atan2

atan2 - clojure.math | ClojureDocs - Community-Powered Clojure Documentation and Examples

Returns the angle theta from the conversion of rectangular coordinates (x, y) to polar coordinates (r, theta). Computes the phase theta by computing an arc tangent of y/x in the range of -pi to pi. For more details on special cases, see: https://docs.oracle.com/javase/8/docs/api/java/lang/...

Coderanch

coderanch.com › t › 375015 › java › atan-atan

what is the different between atan() and atan2()? (Java in General forum at Coderanch)

November 2, 2004 - Nor will Math.atan work well if y=0, since division by 0 is not allowed. But Math.atan2 keeps the x and y arguments separated, so it can tell which quadrant the answer is in, and it can handle the case y=0.

GeeksforGeeks

geeksforgeeks.org › java › java-lang-math-atan2-java

java.lang.Math.atan2() in Java - GeeksforGeeks

June 20, 2021 - atan2() is an inbuilt method in Java that is used to return the theta component from the polar coordinate. The atan2() method returns a numeric value between - ... \theta of a (x, y) point and the positive x-axis.

Apache

pig.apache.org › docs › r0.15.0 › api › org › apache › pig › piggybank › evaluation › math › ATAN2.html

ATAN2 (Pig 0.15.0 API)

math.ATAN2 implements a binding to the Java function Math.atan2(double,double).

Find elsewhere

Google Bing Mojeek

Tutorialspoint

tutorialspoint.com › java › lang › math_atan2.htm

Java - Math atan2(double, double) Method

The Java Math atan2(double y,double x) method converts rectangular coordinates (x, y) to polar (r, theta). This method computes the phase theta by computing an arc tangent of y/x in the range of -pi to pi. Special cases ?

MDN Web Docs

developer.mozilla.org › en-US › docs › Web › JavaScript › Reference › Global_Objects › Math › atan2

Math.atan2() - JavaScript | MDN

December 29, 2025 - The Math.atan2() method measures the counterclockwise angle θ, in radians, between the positive x-axis and the point (x, y).

Educative

educative.io › answers › how-to-use-math-atan2double-y-double-x-in-java

How to use Math atan2(double y, double x) in Java

The atan2() function in Java accepts two argument values, x and y.

Vultr Docs

docs.vultr.com › java › standard-library › java › lang › Math › atan2

Java Math atan2() - Calculate Arc Tangent | Vultr Docs

November 22, 2024 - The method signature is Math.atan2(double y, double x), and it specifically returns the angle in radians from the x-axis to a point (y, x).

Stack Overflow

stackoverflow.com › questions › 70541352 › java-a-way-to-get-from-an-angle-the-atan2-value-alpha

math - Java a way to get from an angle the atan2 value (alpha)? - Stack Overflow

double dx = mx - px; double dy = my - py; double alpha = Math.atan2(dy, dx); float angle = (float) Math.toDegrees(alpha); angle += 10; Now I want to convert the angle to the alpha value (atan2) is there a way how i can do that? The purpose is that I have a game an want to fire bullets with a variation of the degree like a shotgun. java ·

Tutorialspoint

tutorialspoint.com › home › java › java atan2 method

Java atan2 Method

September 1, 2008 - Java Vs. C++ ... The method converts rectangular coordinates (x, y) to polar coordinate (r, theta) and returns theta. ... X − X co-ordinate in double data type. Y − Y co-ordinate in double data type.

Codecademy

codecademy.com › docs › java › math methods › .atan2()

Java | Math Methods | .atan2() | Codecademy

August 24, 2022 - The Math.atan2() method returns the counterclockwise angle, in radians, between a (x,y) point and the positive x-axis. ... Looking for an introduction to the theory behind programming?

Scala Users

users.scala-lang.org › documentation

The scala.math.atan2 function documentation could be improved - Documentation - Scala Users

December 29, 2019 - I’m looking at this page for the documentation of the scala.math.atan2 function. In my opinion the documentation has vital information missing. It would be great if this and all the inverse trig functions explain explicitly which angles they return. The function ought to say that the function returns a method between some angle and some angle.

Microsoft Learn

learn.microsoft.com › en-us › dotnet › api › java.lang.math.atan2

Math.Atan2(Double, Double) Method (Java.Lang) | Microsoft Learn

[<Android.Runtime.Register("atan2", "(DD)D", "")>] static member Atan2 : double * double -> double · y · Double · the ordinate coordinate · x · Double · the abscissa coordinate · Double · the theta component of the point (r, theta) in polar coordinates that corresponds to the point (x, y) in Cartesian coordinates. Attributes · RegisterAttribute · Java documentation for java.lang.Math.atan2(double, double).

Programiz

programiz.com › java-programming › library › math › atan2

Java Math atan2()

... Note: The coordinates x and y represent a point in a two-dimensional plane. returns angle θ by converting coordinates (x, y) to coordinates (r, θ) class Main { public static void main(String[] args) { // two coordinates x and y double x = 3.7; double y = 6.45; // get angle θ double theta ...

Processing

processing.org › reference › atan2_.html

atan2() / Reference / Processing.org

Documentation→Reference→Math→Trigonometry · Calculates the angle (in radians) from a specified point to the coordinate origin as measured from the positive x-axis. Values are returned as a float in the range from PI to -PI.