nodes | 易学教程

Is the root node an internal node?

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So I've looked around the web and a couple of questions here in stackoverflow here are the definition: Generally, an internal node is any node that is not a leaf (a node with no children) Non-leaf/Non-terminal/Internal node – has at least one child or descendant node with degree not equal to 0 As far as i understand it, it is a node which is not a leaf. I was about to conclude that the root is also an internal node but there seems to be some ambiguity on its definition as seen here: What is an "internal node" in a binary search tree? As the wonderful picture shows, internal nodes are nodes

Vis.js network node customization: cards as nodes

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问题 I would like to build a network where the nodes represent information that is structured similarly to cards. With a card I mean a structure composed of two areas: multi-line text area where I can put information that comes from different resources, like a name, a phone number, an address and control area where I can have 2-3 buttons (preferably with icons) that maximize the node, or make the node a root/main one etc. As far as I could see from the vis.js documentation see example here, it is

hadoop/hdfs/name is in an inconsistent state: storage directory(hadoop/hdfs/data/) does not exist or is not accessible

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I have tried all the different solutions provided at stackoverflow on this topic, but of no help Asking again with the specific log and the details Any help is appreciated I have one master node and 5 slave nodes in my Hadoop cluster. ubuntu user and ubuntu group is the owner of the ~/Hadoop folder Both the ~/hadoop/hdfs/data & ~/hadoop/hdfs/name folder exist and permission for both the folders are set to 755 successfully formated the namenode before starting the script start-all.sh THE SCRIPT FAILS TO LAUNCH THE "NAMENODE" These are running at the master node ubuntu@master:~/hadoop/bin$ jps

How can I remove all nodes from a scenekit scene?

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Hi I am trying to remove all nodes from my Scenekit scene but I cannot for the life of me figure out a way. It seems logical to me that there must be a function for doing this automatically but I cannot find it. In context, I am trying to remove all nodes so I can reset my scene, which will happen reasonably often. Perhaps there is another way of doing this and I would be fine with that, I'm not stuck with having to remove all nodes. Thanks! Alan Try this (assuming you are using Swift): rootNode.enumerateChildNodes { (node, stop) in node.removeFromParentNode() } Works for me. Alessandro

Is it possible to display one object multiple times in a VirtualStringTree?

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I realize that I really need to rewrite my programs data structure (not now, but soon, as the deadline is monday), as I am currently using VST (VirtualStringTree) to store my data. What I would like to achieve, is a Contact List structure. The Rootnodes are the Categories, and the children are the Contacts. There is a total of 2 levels. The thing is though, that I need a contact to display in more than 1 category, but they need to be synchronized. Particularly the Checkstate . Currently, to maintain sync, I loop thru my whole tree to find nodes that have the same ID as the one that was just

Find the parent node of a node in binary search tree

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So I want to find the parent node of a Node in a binary tree. Suppose that I input 30,15,17,45,69,80,7 in the tree through a text file. The tree should be 30 15 45 7 17 69 80 And here is my code : Node* BST::searchforparentnode(Node* pRoot, int value) { if(pRoot->pleft == NULL && pRoot->pright == NULL) return NULL; if(pRoot->pleft->value == value || pRoot->pright->value == value) return pRoot; if(pRoot->value > value) return searchforparentnode(pRoot->pleft,value); if(pRoot->value < value) return searchforparentnode(pRoot->pright,value); } In this case i'm not consider if the user input the

Run multiple elasticsearch nodes as a service on one Ubuntu-Server

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I have a server running Ubuntu 14.04 with 220 GB of ram on which I'd like to run elasticsearch. According to the documentation, one node should not have more than 32 GB of RAM, so I guess I have to run several nodes on this one machine in order to make use of all that RAM. I'm considering running 4 nodes with 28 GB of memory for each. How do I set this up as an ubuntu service, so that all of the nodes automatically come back up after a system reboot for example? I guess I have to edit /etc/init.d/elasticsearch in some way - can anyone help me out? Thank you guys so much! I gave up after a

Difference between javascript .childNodes & .children

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I have been working with javascript for a week now. I am currently working on making things work/change through nodes. But I have been noticing something strange, well for an unskilled javascripter it is. I have a structure in my site like this: <html> <head> <title>....</title> <link/> <script></script> </head> <body> <div 1> <div 2></div> </div> </body> </html> When I am trying to find a childnode with the next function: var headerBox = document.body.childNodes; var txt = ""; for (var x = 0; x < headerBox.length; x ++) { txt =txt+"Childnode["+x+"]: "+headerBox[x].localName+" ("+headerBox[x]

What type of algorithm should i use?

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Lets say I have four group A [ 0, 4, 9] B [ 2, 6, 11] C [ 3, 8, 13] D [ 7, 12 ] Now I need one number from each group(i.e a new group) E [num of A,num of B, num of C, num of D], such that the difference between the maximum num in E and minimum num in E should be possible lowest.What type of problem is this ? which graph algorithm will be better to solve this kind of problem ? Thanks in advance. P.S : I'm trying to solve this in java and sorry for the unspecified title. Edit : Finally I've found what I'm actually looking for http://rcrezende.blogspot.in/2010/08/smallest-relevant-text-snippet

NPM run parallel task, but wait until resource is available to run second task

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In npm, how can I run two or more parallel tasks, but waiting for the resource that the first task will create to be available to the second task to use it, and so forth? example (conceptual): npm run task1 & waitfor task1 then task2 & waitFor task3 then task4 ... any ideas? EDIT As an example: Lets say that my first task is starting a webserver, and my second task is consuming data from that web-server every time an event happens. Another example: My first task could be starting webdriver-manager, my second task, starting a webserver, and my third task, run e2e tests everty time my files are