points

问题 I am working on a university project which combines data science and GIS. We need to find an open-source solution capable of obtaining additional information from a massive GPS coordinates dataset. Clearly, I cannot use any API with daily request limit. THE DATA Here you can find a sample of the dataset the Professor provided us: longitude <- c(10.86361, 10.96062, 10.93032, 10.93103, 10.93212) latitude <- c(44.53355, 44.63234, 44.63470, 44.63634, 44.64559) longlat <- data.frame(longitude,

问题 Hello I am trying to figure out the best way to setup my two mysql tables for a simple points system? What I have: 1 - users table with id (unique),name,email,etc 1 - points table with id (auto incrementing),user_id (corresponds with id field in user table), points Currently I am just writing to the points table and letting the id field auto increment... and setting the user_id field and points fields with php in the query. Is this the "proper" way to set this up? Where the id from the user

问题 I have many points inside a square. I want to partition the square in many small rectangles and check how many points fall in each rectangle, i.e. I want to compute the joint probability distribution of the points. I am reporting a couple of common sense approaches, using loops and not very efficient: % Data N = 1e5; % number of points xy = rand(N, 2); % coordinates of points xy(randi(2*N, 100, 1)) = 0; % add some points on one side xy(randi(2*N, 100, 1)) = 1; % add some points on the other

问题 I would like to get most efficient way to find local maxima in huge data point sets containing thousands of values. As input are used two long lists with x and y values. Consider this simple example: xval = [-0.15, -0.02, 0.1, 0.22, 0.36, 0.43, 0.58, 0.67, 0.79, 0.86, 0.96 ] yval = [-0.09, 0.13, -0.01, -0.1, -0.05, 0.2, 0.56, 0.47, 0.35, 0.43, 0.69] Desired output is list with indexes of peak points, here locMaxId =[1,6,10]. Comparing the closest neighbours is solution, but for 10k values?

问题 I am using Three.js r83. I am trying to dynamically add points to a geometry, but the scene never gets updated. This works : var tmaterial = new THREE.PointsMaterial({ color: 0xff0000, size: 5, opacity: 1 }); var tgeometry = new THREE.Geometry(); var pointCloud = new THREE.Points(tgeometry, tmaterial); for(var i = 0; i< 1000; i++) { x = (Math.random() * 200) - 100; y = (Math.random() * 200) - 100; z = (Math.random() * 200) - 100; tgeometry.vertices.push(new THREE.Vector3(x, y, z)); }

问题 I am using Three.js r83. I am trying to dynamically add points to a geometry, but the scene never gets updated. This works : var tmaterial = new THREE.PointsMaterial({ color: 0xff0000, size: 5, opacity: 1 }); var tgeometry = new THREE.Geometry(); var pointCloud = new THREE.Points(tgeometry, tmaterial); for(var i = 0; i< 1000; i++) { x = (Math.random() * 200) - 100; y = (Math.random() * 200) - 100; z = (Math.random() * 200) - 100; tgeometry.vertices.push(new THREE.Vector3(x, y, z)); }

问题 It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center. Closed 7 years ago . I'm trying to crop a picture in C# from integer x, y coordinates.. I just can't figure out how to get it? public void doCroppedImage(int pointX, int pointY) { Rectangle cropRect = //??? } 回答1: You can use this

问题 This question is intended to both abstract and focus one approach to my problem expressed at "Find the most colourful image in a collection of images". Imagine we have a set of circles, each has a number of points around its circumference. We want to find a metric that gives a higher rating to a circle with points distributed evenly around the circle. Circles with some points scattered through the full 360° are better but circles with far greater numbers of points in one area compared to a

问题 The goal is to generate random points inside a rectangle that I created using the following code: from graphics import * import random import math def plotSquare(win, side): rect=Rectangle(Point(500/2-side//2,500/2-side//2), Point(500//2+side//2,500//2+side//2)) rect.setWidth(5) rect.draw(win) def plotCircle(win, radius, color): cir=Circle(Point(250,250), (radius)) cir.setFill(color) cir.draw(win) def plotPoints(win, side, pts): for i in range(250-side//2): p1=Point(random.randint(0,side),

问题 I already have my xy graph using the line graph. What troubles me is how can I ask matlab to give me the value of y if I give the value of x. That is, the corresponding value of y when I give x in the line I have in the graph. 回答1: What I think you want to do is interpolation. Say your x and y values that you used for plotting are stored in xData and yData , respectively. Then, you find a value y that corresponds to a value x using INTERP1 y = interp1(xData,yData,x); By default, interp1