ellipse

问题 I would like to reproduce the following figure in MATLAB: There are two classes of points with X and Y coordinates. I'd like to surround each class with an ellipse with one parameter of standard deviation, which determine how far the ellipse will go along the axis. The figure was created with another software and I don't exactly understand how it calculates the ellipse. Here is the data I'm using for this figure. The 1st column is class, 2nd - X, 3rd - Y. I can use gscatter to draw the points

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 6 years ago . So I add an Ellipse2D.Float to a JPanel (and to an ArrayList) when clicked. I want to know if after this has been done I can then move the shape (say, through shift-click). At the moment it seems to be static and I cannot drag it anywhere. Furthermore, is it possible to connect two circles with a line in such a

问题 I want to be able to click the JButton and change the next individual ellipse I make to its respective color, Red or Black, from its default Blue. So far I'm able to change the color of all the ellipses I have made. public class MainClient { private JFrame frame; /** * Launch the application. */ public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { try { MainClient window = new MainClient(); window.frame.setVisible(true); } catch (Exception e) {

问题 I am trying to generate points within ellipsoid and then trying to fit with smooth ellipsoid surfaces. The goal is to fit with unknown data where i have to find value of a,b and c in 3 principal axes. Rinv should be equivalent to pc. But what i am getting pc in different order. So i have to find correct order to rotate my data to matlab coordinate. a=3; b=5; c=1; index=1; for i=1:500000 x=10*rand-5; y=10*rand-5; z=10*rand-5; if ((x^2/a^2) + (y^2/b^2) + (z^2/c^2) -1) <0 C(index,:)=[x,y,z];

问题 I am trying to plot rings of trees and calculate their areas. However, I have noticed that in reality not all rings have symmetric radii like a circle. I have data measurements of 4 radii, and I would like to plot rings (or any similar shape) following each point of every radio like this example (this figure was done manually with vectors in PowerPoint): the problem is that in R I found only the possibility to plot these rings with the circles option from the symbols() function, and I got

问题 I have a question about fitting ellipses to data with the ellipse center at the origin. I have explored two methods that fit ellipses but generate an arbitrary center unless I manipulate the data with some imaginary mirror points. Method#01 This portion of the script directly comes from this useful post. I'm copying the codes directly here for ease. fit.ellipse <- function (x, y = NULL) { # from: # http://r.789695.n4.nabble.com/Fitting-a-half-ellipse-curve-tp2719037p2720560.html # # Least

问题 Update : answer on how to draw one using Superformula is at the end I need to draw a rounded rectangle such as this one, using a SuperEllipse. Drawing one when being able to plot wherever was easy : But in HLSL where you cannot, I got stuck on the condition for plotting or not a pixel : Here is the HLSL code : sampler2D input : register(s0); /// <summary>Explain the purpose of this variable.</summary> /// <minValue>0.0</minValue> /// <maxValue>10.0</maxValue> /// <defaultValue>4.0<

问题 Envision examplefn <- function(x = NULL, ...){str(x)} I'm trying to get this function to honor the implicit x = NULL . Consider the following: For a call using both x and ... this results as expected in: > examplefn(1,2) num 1 If using an explicit x = NULL , the behavior also is as expected: > examplefn(x = NULL,2) NULL However, when attempting (and expecting the usage of x = NULL from the function definition, I get: > examplefn(2) num 2 Implying, that the call is evaluated by argument order,

问题 I have a play button which I want to change the background image so it looks like a pause button when clicked, I have already seen many guides on how to do this however my Ellipse template seems to make my code much different from anything I have researched. Here is my Code: <Button HorizontalAlignment="Left" Width="40" Height="40" Click="Button_Click_2"> <Button.Template> <ControlTemplate TargetType="{x:Type Button}"> <Grid> <Ellipse Stroke="Black"> <Ellipse.Fill> <ImageBrush ImageSource=

问题 class Particle{ PVector velocity, location; //PVector variables for each particle. Particle(){ //Constructor - random location and speed for each particle. velocity = new PVector(random(-0.5,0.5), random(-0.5,0.5)); location = new PVector(random(0,width),random(0,width)); } void update() { location.add(velocity); } //Motion method. void edge() { //Wraparound case for particles. if (location.x > width) {location.x = 0;} else if (location.x < 0) {location.x = width;} if (location.y > height)