ellipse

问题 Sorry if this is a stupid question, but is there an easy way to plot an ellipse with matplotlib.pyplot in Python? I was hoping there would be something similar to matplotlib.pyplot.arrow, but I can't find anything. Is the only way to do it using matplotlib.patches with draw_artist or something similar? I would hope that there is a simpler method, but the documentation doesn't offer much help. Thanks for any advice! 回答1: Have you seen the matplotlib ellipse demo? Here they use matplotlib

问题 I would like to make a sector of a circle on WP7. I tried to do this with the ellipse class and I found a lot of solution, which make a gauge or pie chart or something, but I need just the essence. Could anyone help? the aim is to show just one part of a circle (or ellipse). Like the yellow area in the picture: Thanks, Laci 回答1: Here's a fairly simple solution to the problem, though it does not use an Ellipse and it requires a little trigonometry: <Path Fill="Black" Data="M0,0 L0,-100 A100

问题 I have a dataframe (site by species matrix)that looks like this: SP1 SP2 SP3 SP4 US 5 6 2 5 US 5 6 2 5 UK 5 6 2 5 AUS 5 6 2 5 I'm trying to create a PCoA plot (Principal Coordinate Analysis) with 95% confidence polygons/ellipses using ggplot2. I got the code for base package, but I want it in ggplot2. I need to uniquely color code each country along with each ellipse having the corresponding color code for the country and the legends. #My current code require(vegan) df <- as.matrix(df[,-1])

问题 In Java for some reason the Ellipse2D.Double uses the parameters (height, width, x, y) where as when I create a RectF in Android the parameters are (left, top, right, bottom) so I'm a bit confused on adjusting to the differences. If a create an Ellipse in Java and use the following: //Ellipse2D.Double(height, width, x, y) x = 100; y = 120; centerX = getWidth() / 2; centerY = getHeight() / 2; //Ellipse2D.Double(100, 120, (centerX - 100) * 2, (centerY - 120) * 2); new Ellipse2D.Double(x, y,

问题 Now i draw pictures in circle by formula : float x = CIRCLE_RADIUS * (float) Math.sin(2f * Math.PI * drawSquareIndex / ITEMS_COUNT + angle) * 1.75f; where x - is a X point of circle item. And i have a circle. but i want to draw pictures on ellipse. What the formula i need to use? How i can do that? P.S. sorry about quality. Make a question from phone. 回答1: You can use parametric ellipse equaition ( a = b is a case of cirle ): x = a * cos(t) y = b * sin(t) t = 0..2*PI In your case // Pseudo

问题 Given a set of data I have calculated an ellipse that fit to them using the next command: eli<-ellipse(cor(x,y),scale=c(sd(x),sd(y)), centre=c(mean(x), mean(y)), level = 0.95) Where "x" and "y" are the columns of my bivariate data. I would like to know how to find the elements of my ellipse (in red), say: the foci and the a" and "b" values. In an attempt to find the semi-axis distance I tried to get a lineal regression of the data but I truly doubt of my method How can I find those parameters

问题 Let me elaborate. I define a D2D Rectangle like so: D2D1_RECT_F rect1 = D2D1::RectF(5, 0, 150, 150); and an ellipse as: D2D1_ELLIPSE ellipse1 = D2D1::Ellipse(D2D1::Point2F(75.f, 75.f), 75.f, 75.f); To draw these shapes, I first transform them and pass them to the rendertarget: m_pRenderTarget->SetTransform(D2D1::Matrix3x2F::Translation(D2D1::SizeF(200, 50))); m_pRenderTarget->FillRectangle(&rect1, m_pLinearGradientBrush); I'd like a way to create a random number of rectangles and ellipses,

问题 I'm plotting confidence ellipses for uniformly distributed points. When plotting the ellipse and the scatter plot using Matplotlib, I find that a portion of the ellipses are clipped by the subplot. So far, I have tried changing the figure sizes, but it does not change the plot. How do I change the plot size to correctly fit the ellipses within the displayed plot? Code to generate ellipses: Modified from below link multidimensional confidence intervals import numpy as np import seaborn as sns

问题 I have a setup in which I have some ImageViews around a center, and when the user clicks a Button, I want the Views to rotate around the center view, in an elliptical way. What I have at current time is an elliptical movement, but the view is rotating in a weird axis, not on the center axis, as required. <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match

问题 Probably a simple question but: How do I programmatically change the color of an ellipse that is defined in XAML based on a variable? Everything I've read on binding is based on collections and lists -can't I set it simply (and literally) based on the value of a string variable? string color = "red" color = "#FF0000" 回答1: It's worth pointing out that the converter the other posts reference already exists , which is why you can do <Ellipse Fill="red"> in xaml in the first place. The converter