treemap

Different colors with gradient for subgroups on a treemap ggplot2 R

孤街浪徒 提交于 2019-11-29 10:25:57
I have a treemap plot (shown below). The only change that I want to have is to change the color of subgroup (YEAR in the plot) to different colors, not all blue. Is this possible at all? Sample data frame PL <- c(rep("PL1", 4), repl("PL2", 4), rep("PL3", 4), rep("PL4", 4)) CNT <- sample(seq(1:50), 16) YEAR <- rep(c("2015", "2016", "2017", "2018"), 4) df <- data.frame(PL, YEAR, CNT) Plot PL <- c(rep("PL1", 4), repl("PL2", 4), rep("PL3", 4), rep("PL4", 4)) CNT <- sample(seq(1:50), 16) YEAR <- rep(c("2015", "2016", "2017", "2018"), 4) df <- data.frame(PL, YEAR, CNT) # plot library(ggplot2)

Java “cannot cast to Comparable” when using TreeMap [duplicate]

给你一囗甜甜゛ 提交于 2019-11-29 10:05:50
Possible Duplicate: Java: SortedMap, TreeMap, Comparable? How to use? I am using the Java JungI graph package and Netbeans 7. I am getting the following error from Java: Exception in thread "main" java.lang.ClassCastException: graphvisualization.MyVertex cannot be cast to java.lang.Comparable at java.util.TreeMap.put(TreeMap.java:542) Here is the code associated with the error: SortedMap<MyVertex, Double> vMap = new TreeMap<MyVertex, Double>(); double curRank = 0; for(MyVertex v: g.getVertices()) //g is a SparseGraph<MyVertex, MyEdge> { curRank = vertexRank.getVertexScore(v); vMap.put(v,

How to plot grid plots on a same page?

﹥>﹥吖頭↗ 提交于 2019-11-29 08:42:34
I am using a package ( treemap ) that uses grid package to produce a treemap. However, I would like to plot several of these treemaps together, to add different color schemes to these plots. tmPlot function uses grid.newpage function, which clears the graphics window. I have not found a way to save grid.newpage objects as you can do for ggplot2 objects. Is there a way to plot several grid.newpage objects to a same window? ## Example library(treemap) # load Gross national income data data(GNI2010) size <- aggregate(GNI ~ continent, GNI2010, sum) size <- size[with(size, order(GNI, decreasing = T

Can I use images as the background rectangles for d3 treemaps?

天涯浪子 提交于 2019-11-29 08:12:07
问题 Is it possible to make a treemap in d3 with the background of each rectangle be an image? I am looking for something similar to what was done in Silverlight here, but for d3. If it is possible, are there any recommended tutorials that walk through the process of connecting the background to an image? 回答1: Yes, there are several ways of using images in SVGs. You probably want to define the image as a pattern and then use it to fill the rectangle. For more information, see e.g. this question

TreeMap源码分析,看了都说好

馋奶兔 提交于 2019-11-29 08:09:45
概述 TreeMap 也是Map接口的实现类,它最大的特点是 迭代有序 ,默认是 按照key值 升序迭代(当然也可以设置成降序)。在前面的文章中讲过LinkedHashMap也是迭代有序的,不过是按插入顺序或访问顺序,这与TreeMap需要区分开来。TreeMap内部用红黑树存储数据,而不是像HashMap、LinkedHashMap、WeakHashMap一样使用哈希表来存储。 此外,TreeMap也是非线程安全的,并且与基于哈希表实现的Map实现类不同,TreeMap的key和value值都不允许为Null。 红黑树 在介绍红黑树之前,先简单介绍一下 排序二叉树 。排序二叉树是一种特殊结构的二叉树,可以非常方便地对树中所有节点进行排序和检索。 排序二叉树可以为空树,如果它不为空,则满足以下性质: 若它的左子树不空,则左子树上所有节点的值均小于它的根节点的值; 若它的右子树不空,则右子树上所有节点的值均大于它的根节点的值; 它的左、右子树也分别为排序二叉树。 下图即为一个排序二叉树: 对排序二叉树,若按中序遍历就可以得到由小到大的有序序列。 排序二叉树虽然可以快速检索,但在最坏的情况下:如果 插入的节点集本身就是有序的 ,要么是由小到大排列,要么是由大到小排列,那么最后得到的排序二叉树将变成链表:所有节点只有左节点(如果插入节点集本身是大到小排列);或所有节点只有右节点

Java Map sort by value

拥有回忆 提交于 2019-11-29 06:41:33
I was looking for ways of sorting Map<String, Integer> by values. I found this post , which solved my sorting problem, but not exactly. According to the post, I wrote the following code: import java.util.*; public class Sort { static class ValueComparator implements Comparator<String> { Map<String, Integer> base; ValueComparator(Map<String, Integer> base) { this.base = base; } @Override public int compare(String a, String b) { if (base.get(a) >= base.get(b)) { return 1; } else { return -1; } } } public static void main(String[] args) { HashMap<String, Integer> map = new HashMap<String, Integer

【从二叉树到红黑树】清晰理解红黑树的演变---红黑的含义

夙愿已清 提交于 2019-11-29 06:25:51
网上关于红黑树的博文很多,但是多是上来即讲定义,未说其所以然,难以理解且无所营养,甚者示例图有误且概念模糊的比比即是; 由于最近在学习相关知识找到一篇较为透彻且深入剖析的博文特此转载修订 注:原文示例图中有所错误本文中已重新修正,并增加了红黑树相关部分更多内容 前言 红黑树,对不少人来说是个比较头疼的名字,在网上搜资料也很少有讲清楚其演变来源的,多数一上来就给你来五条定义,红啊黑啊与根节点距离相等之类的,然后就开始进行旋转、插入、删除这些操作。一通操作下来,连红色和黑色怎么来的,是什么含义,有什么作用都云里雾里的,能搞清楚就怪了。 本文介绍红黑树,暂时不涉及任何代码,只是帮助你理解红黑树的演变来源,树结构中红黑色具体含义,保证你理解了过后,再去看什么旋转插入的东西,要清晰得多。换句话说,理解本文要描述的内容是从代码级理解红黑树的基础。 开始之前,我还是恳请你保持耐心,一步一步仔细看完,浮躁的话真的做不好任何事情。 正文 红黑树的起源,自然是二叉查找树了,这种树结构从根节点开始, 左子节点小于它,右子节点大于它 。每个节点都符合这个特性,所以易于查找,是一种很好的数据结构。但是它有一个问题,就是容易偏向某一侧,这样就像一个链表结构了,失去了树结构的优点,查找时间会变坏。 所以我们都希望树结构都是矮矮胖胖的,像这样: 而不是像这样: 在这种需求下,平衡树的概念就应运而生了。

Python 2.6 TreeMap/SortedDictionary?

蓝咒 提交于 2019-11-29 05:40:17
Is there a built-in sorted dictionary implementation in Python 2.6, or are hashtables the only kind? Clarifications: I'm asking about sorted dictionarys, not ordered dictionaries! James Hurford I think the answer here is no. There is a Treemap but it isn't in the python standard library. http://pypi.python.org/pypi/treemap/ I think to those who don't like my answer, may think it's wrong due to a recent update. Please note this is for Python 2.6, not 2.7 or Python 3 Please add the correct answer if you still think it's wrong, or unhelpful, or at least give a reason why you think it's a bad

Gradient color in a treemap for D3

前提是你 提交于 2019-11-29 05:21:57
First of all this is different from the previous question asked in the posts, for what i am trying to achieve is a gradient for the entire treemap in d3, like what we have in google treemaps. I am trying to implement http://bost.ocks.org/mike/treemap/ and working on the same, but in d3 i was trying to have a color gradient in it. Currently I am doing this by color = d3.scale.category20c() and .style("fill", function(d) { return color(d.name)}) on my svg element. But i want to have a gradiant color more like a heatmap, so as to make larger boxes in treemap more green and smaller boxes less

红黑树(面试会问的数据结构)

风流意气都作罢 提交于 2019-11-29 04:12:37
要理解红黑树就要先理解二叉查找树 二叉查找树特征: 1.左子树上所有结点的值均小于或等于它的根结点的值。 2.右子树上所有结点的值均大于或等于它的根结点的值。 3.左、右子树也分别为二叉排序树。 二叉查找树的优点:查找所需数的最大次数为等同于二叉查找树的高度。插入的时候也是类似,通过一层层比较大小,找到适合插入的位置。 二叉查找树的缺点: 如图,原始只有三个点,当插入5,6,7之后就会导致查找的性能降低,几乎变成线性 而红黑树正是为了解决二叉查找树多次插入新节点而导致的不平衡 红黑树:是一种自平衡的二叉查找树。除了符合二叉查找树的基本特征外还有如下特性。(红黑树从根到叶子的最长路径不超过最短路径的两倍) 1.节点是红色或黑色。 2.根节点是黑色。(记) 3.每个叶子节点都是黑色的空节点。(记) 4 每个红色节点的两个子节点都是黑色。(就是不能有连续的红色)(记) 5.从任一节点到其每个叶子的所有路径都包含相同数目的黑色节点。(记) 下图中这棵树,就是一颗典型的红黑树: 红黑树的特性和优势,及在什么情况下需要变色什么情况下需要旋转 面试问题: 一.红黑树有哪些性质? 1.节点是红色或黑色。 2.根节点是黑色。 3.每个叶子节点都是黑色的空节点。 4 每个红色节点的两个子节点都是黑色。(就是不能有连续的红色) 5.从任一节点到其每个叶子的所有路径都包含相同数目的黑色节点。 2.