radians

Change axis in polar plots in matlab to radians

由 风格不统一 提交于 2019-12-24 00:39:00
问题 So matlab rightfully uses radians for trigonometric functions and in the actual plotting of polar plots. However annoyingly it puts the angular axis in degrees, is there any way to change this? 回答1: The text objects representing angular values are created by the polar function in the following section of its code (Matlab R2010b): % annotate spokes in degrees rt = 1.1 * rmax; for i = 1 : length(th) text(rt * cst(i), rt * snt(i), int2str(i * 30),... 'HorizontalAlignment', 'center', ...

JavaScript atan2() function not giving expected results

由 人走茶凉 提交于 2019-12-14 03:45:20
问题 Normally, polar coordinates go from 0 to π to 2 π (just before 2 π really, as it equals 0 again). However, when using the JavaScript atan2() function, I'm getting a different, weird range: Cartesian X | Cartesian Y | Theta (θ) =========================================================== 1 | 0 | 0 (0 × π ) 1 | 1 | 0.7853981633974483 (0.25 × π ) 0 | 1 | 1.5707963267948966 (0.5 × π ) -1 | 1 | 2.356194490192345 (0.75 × π ) -1 | 0 | 3.141592653589793 (1 × π ) -1 | -1 | -2.356194490192345 (-0.75 × π

Sine to radians Objective-C

由 試著忘記壹切 提交于 2019-12-13 08:56:41
问题 This part of an app that I am working on, I have the following equation in objective C. All variables are floats. r is a sine of an angle and I would like to convert r to radians when diplayed in the text field. r = ns/ni r = sinf(r); rr = asinf(r); textfieldRi.text = [NSString stringwithFormat:@"%.02f", rr]; I am not getting correct results. Any suggestions please? 回答1: I'm not entirely certain what you think you're gaining by executing a sine followed by an inverse sine, except possibly to

Smooth 'turning' script

由 天涯浪子 提交于 2019-12-12 03:47:59
问题 I am making an HTML5 Canvas game using Javascript. I want to make an object turn smoothly to a certain direction. I am storing the direction as a variable, and using radians. The code works like this: window.setInterval(loop,25); var dir = 0; var targetDir = Math.PI/2; function loop() { dir += (targetDir - dir) / 5; document.getElementById('text').innerHTML = dir; //To display the direction } <p id='text'></p> It will work most of the time, but if the direction and target direction are on

How to convert a degrees calculation to radians? (Kawa to Java)

由 隐身守侯 提交于 2019-12-11 11:39:40
问题 I have tried to convert a calculation from an app I made using MIT AppInventor which uses Kawa to Android using Java.The problem I'm facing is that the trigonometric parts of the calculation in Kawa are using degress.My question is how do I translate this calculation to Java and get the same output? This is how I do the calculation is Kawa,all variables are of type double: Tri 1=atan(Offset Depth/Offset Length) Mark 1=sqrt(Offset Length^2+Offset Depth^2) Tri 2=(180-Tri1)/2 Mark 2=Duct Depth/

Why do we use radians in programming?

由 爱⌒轻易说出口 提交于 2019-12-09 11:20:31
问题 I like radians just as much as the next guy, and typically prefer to use them over degrees, but why do we use radians in programming? To rotate something 180 degrees, you need to rotate it by 3.14159265... . Sure, most languages have some kind of constant for pi, but why do we ever want to use irrational numbers like pi when we can instead use integers, especially for simple programs? We're relying on the computer to say that 3.14159265 is close enough to pi that functions like sine and

Finding the closest difference between 2 degrees of a compass - Javascript

由 五迷三道 提交于 2019-12-04 05:01:24
问题 I'm basically trying to find how many degrees apart two points of a compass are. For example if a person is facing 270 and their compass is 280 there are 10 degrees between those 2 points. I'd also like a negative number if it's to the left and positive to the right, relative to the 1st heading. The problem comes when the to headings are 350 and 020 for example. These two points are 30 degrees apart but would give a result of -330. Below is an example of my code: function ConvertToRadians(

How to use atan2() in combination with other Radian angle systems

由 ╄→尐↘猪︶ㄣ 提交于 2019-12-03 13:50:41
问题 I am struggling with this in JavaScript, but this problem applies to many other languages/environments as well. I want to have one object rotating towards the position of another object, and I use: atan2(obj1.dy, obj1.dx) - obj2.getRotation() to check if the second object should rotate clockwise or counterclockwise at a given time. In KineticJS, the JS/HTML5/Canvas programming environment I am using, the angle is specified in radians from 0 to 2 pi starting at the positive Y axis and going

Why does OpenGL use degrees instead of radians?

由 爱⌒轻易说出口 提交于 2019-12-03 05:23:56
问题 The OpenGL designers were never afraid of mathematics, and knowledge of linear algebra is essential for all but the simplest OpenGL applications. I think it can safely be assumed that OpenGL programmers are familiar with angles in radians. Mathematically, radians are more elegant than degrees in every respect. They also have practical advantages: The C standard library uses radians. Pretty much any other library out there uses radians as well. Radians are more convenient in some computations,

Why does OpenGL use degrees instead of radians?

由 冷暖自知 提交于 2019-12-02 18:40:51
The OpenGL designers were never afraid of mathematics, and knowledge of linear algebra is essential for all but the simplest OpenGL applications. I think it can safely be assumed that OpenGL programmers are familiar with angles in radians. Mathematically, radians are more elegant than degrees in every respect. They also have practical advantages: The C standard library uses radians. Pretty much any other library out there uses radians as well. Radians are more convenient in some computations, e.g. the length of a circular arc. Why, then, did the OpenGL designers decide to specify functions
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