I am a beginner in Inkscape, and was pretty confused by the word PATH, when i checked on net, i found various explanations and developed an understanding thinking that a path is the nodes in a straight or curved line. Is my understanding correct?? If not please explain it to me.
Is a path the set of points from a to b?  And is the stroke the "definition" (i.e. the color, shape, etc.) of the path?  And, how can you have a path with no stroke?  Is this only because it is a computer drawing program?  In the real world you can't have a path without a stroke can you?  If it matters, I am using Inkscape.
In Java when one interface extends another, why would one redeclare a method in a subinterface? I've been looking at the JMS API from J2EE and found a strange behavior where certain methods that are declared in an interface (e.g., createQueue in Session) are declared again in the subinterfaces such as QueueSession, and with identical documentation.  Since an subinterface "inherits" all the method declarations of the interface it inherits, and since the JavaDoc tool has no problem sorting out the JavaDocs of the subinterface and creating an "inherited operations" list, I can't figure out what this achieves.  The only think of is that initially the call was in Session, and then moved to QueueSession when the specific subclass was created, though then I would have expected to see something in the documentation of the upperclass. But this is just conjecture.  So the question is: Is there a convincing reason to redeclare a method in a subinterface? Full Name Requirement of Commit Phase The Commitment form on Area 51 requires your full name to be provided. Is this publicly viewable? Why not just use the existing usernames? Ubuntu 20.04 on DualBoot fail 90% of tries - Initramfs unpacking failed: Decoding failed I have problem with CRS Bosnia and Herzegovina?  MGI 1901 / Balkans zone 6  EPSG:3908 MGI 31276 / Balkans zone 6  EPSG:31276  Which of these two is OK? When I open google sattelite image with openlayers plugin, MGI 1901 match an image, when I change to MGI 31276 vector layer mismatch about 300m. When I import my layers to Global Mapper, datum of vector is "MGI Austria"   I need this projection: Why is sudoers NOPASSWD option not working? Deleted comments leave badge on iOS app When someone leaves a comment that involves you being notified, you get the notification both on the main toolbar on Stack Exchange and as a notification/badge on the iOS app.  If you read a comment on the website and cause the notification to be removed from the toolbar, the badge also gets removed from the iOS app.  However, when a comment that has previously caused a notification/badge to appear on iOS gets deleted, the badge remains on the iOS app while the notification gets removed from the website toolbar.  Could the badge also be removed from the iOS app in this situation? How do I get powdered mammoth tusk? Am I missing something? I can find plenty of tusks, but I just don't know if I can make them into powder myself or do I have to find them for sale? Lightning component : Get the id of a record In a lightning component I display a list of articles (Article__c custom object) so I ca see, for example, the name of the article, the price, and a button that I'd like redirect to another component which display the details of the article selected.   For now I'm just trying to get the id of the article, in a basic alert in javascript, but I doesn't work : it says the id is null.   Here is a part of the component :  &lt;aura:handler name="init" value="{!this}" action="{!c.doInit}" /&gt; &lt;aura:attribute name="wrappers" type="ListeArticlesWrapper" /&gt; &lt;aura:attribute name="articles" type="Article__c" /&gt;  &lt;aura:attribute name="Detail" type="String"/&gt; &lt;aura:registerEvent name="navigate" type="c:NavigateToDetail"/&gt;  &lt;div class="page"&gt;     &lt;h1&gt;Liste des articles&lt;/h1&gt;     &lt;div class="slds"&gt;         &lt;table class="slds-table slds-table--bordered slds-table--cell-buffer"&gt;             &lt;thead&gt;                 &lt;tr class="slds-text-heading--label"&gt;                     &lt;th scope="col" class="head"&gt;&lt;/th&gt;                     &lt;th scope="col" class="head"&gt;Nom&lt;/th&gt;                     &lt;th scope="col" class="head"&gt;Type&lt;/th&gt;                     &lt;th scope="col" class="head"&gt;Prix&lt;/th&gt;                     &lt;th scope="col" class="head"&gt;&lt;/th&gt;                 &lt;/tr&gt;             &lt;/thead&gt;             &lt;tbody&gt;                 &lt;aura:iteration items="{!v.wrappers}" var="wrap"&gt;                     &lt;tr&gt;                         &lt;td class="cell"&gt;                             &lt;ui:inputCheckbox value="{!wrap.selected}" /&gt;                         &lt;/td&gt;                         &lt;td class="cell"&gt;                            &lt;ui:outputText value="{!wrap.art.Name}" /&gt;                         &lt;/td&gt;                         &lt;td class="cell"&gt;                             &lt;ui:outputText value="{!wrap.art.Type__c}" /&gt;                         &lt;/td&gt;                         &lt;td class="cell"&gt;                             &lt;ui:outputText value="{!wrap.art.Prix__c}" /&gt;                         &lt;/td&gt;                         &lt;td class="cell"&gt;                             &lt;button class="slds-button slds-button--neutral slds-not-selected"                                      onclick="{!c.getDetail}" data="{!wrap.art.Id}"&gt;Details&lt;/button&gt;                         &lt;/td&gt;                     &lt;/tr&gt;                 &lt;/aura:iteration&gt;             &lt;/tbody&gt;         &lt;/table&gt;   The associated controller js (with the function getDetail)  ({ doInit : function(component, event, helper) {     helper.init(component, event); },  getArticles : function(component, event, helper) {     helper.getArticles(component, event); },  getDetail : function(component, event, helper){     var id = event.target.getAttribute("data-data") || event.target.parentNode.getAttribute("data-data")     alert('detail article : id = ' + id); //it gives me null } })   Thanks !  EDIT  And the wrapper class in case you wonder what is the "art" :  public with sharing class ListeArticlesWrapper { //wrapper pour récupérer les articles selectionnés @AuraEnabled public Article__c art {get; set;}  @AuraEnabled public Boolean selected {get; set;} } How to get the CPU cycle count in x86_64 from C++? I can't update my system because it freezes while installing a third-party update (zramswap-enabler)! Sometimes I get the following message in Update manager:  Could not initialize the package information An unresolvable problem occurred while initializing the package information. Please report this bug against the 'update-manager' package and include the following error message: E:The package zramswap-enabler needs to be reinstalled, but I can't find an archive for it.  I tried to remove the zramswap-enabler, but it's impossible because I get the following message: dpkg: error processing zramswap-enabler (--remove):  Package is in a very bad inconsistent state - you should  reinstall it before attempting a removal. Errors were encountered while processing:  zramswap-enabler E: Sub-process /usr/bin/dpkg returned an error code (1)  Actually I would really reinstall that package, but it is unable to do it! If I remove this third-party PPA then the system is warning me about a very very serious problem. So why can I not install/reinstall/remove/update this package and why freezes the updater if I try to update? Landscape topography from grayscale image How to update kernel to the latest mainline version without any Distro-upgrade? Currently I'm running Linux-3.0 and I want to update it to Linux-3.3.1 the latest stable kernel release as mentioned at . Can I update to 3.3.1 in Ubuntu without any risk of crashes? I'm updating my kernel regularly as provided by the Update Manager..Currently I have Linux-3.0.0.17..Can I update?  NOTE:  The latest kernel version any user is supposed to use in Ubuntu is updated automatically via the Update Manager, so no action is normally required by user regarding kernel upgrades. What the question author is referring to is mainline kernel, see: Recently I had to change the folder permissions of /usr folder. Now the whole sudo is not working. If I try to update my system using this command:  sudo apt-get update   I get the following message:  sudo: /usr/lib/sudo/sudoers.so must be only be writable by owner sudo: fatal error, unable to load plugins   So I tried to change the folder permissions by opening Nautilus as root by using this command  gksudo nautilus   But nothing happened. Nautilus didn't open. This is an emergency as the whole of sudo is not working. when I tried searching the solution from Google many suggested re-installation. I don't prefer re-installation. so is there any other solution? HTML from advertisement not rendered correctly I have many times found CSS written on my screen besides images from Stack OverFlow.   It is associated with the advert from Rackspace  Here is a screenshot: I want to fill a part of a picture with more or less evenly and randomly distributed circles which should not overlap. It would be okay if circles are only partly inside the shape.  The density should be like what you see on this page  with values 80-100. (But I do not need so many circles, 30 should be enough, I could repeat the pattern).   I cannot use a grid and "wobble" the circles a bit: The circles are too large and it simply does not look randomly.   Currently I am thinking about a random attempt: Get some random point, measure its distance to existing circles, either paint or throw the point away. Try 100 times and hope that you get the right number of circles (and that it does not take too long). But perhaps someone has a better idea.   The example draws the circles simply manually:  \documentclass{article} \usepackage{tikz} \usetikzlibrary{backgrounds} \begin{document}   \begin{tikzpicture}[framed,gridded,radius=0.5cm]  \draw[red](0,0) rectangle (5,5);   \draw (1,1) circle;   \draw (2.3,1.1) circle ;   \draw (4.5,0.8) circle ;   \draw (5.1,1.8) circle ;   \draw (0.4,3.3) circle ;   \draw (2.1,2.8) circle ;   \draw (3.8,3.5) circle ;   \draw (4.8,4.2) circle ;   \draw (0.8,4.9) circle ;   \draw (2.1,4.1) circle ;   \draw (3.8,2.0) circle ;   \draw (3.5,0.6) circle ;   \draw (3.0,5.0) circle ;      \draw (4.1,5.1) circle ;             \draw (0.9,2.1) circle ;  \end{tikzpicture}  \end{document} Can I use my powers for good? Shouldn't the badge requirements scale? Many badges have fixed requirements, such as:   Answer score of 100 or more   However different websites means a different level of difficulty: the more active users a website has, the easier the badge is to get.  On a new and/or low-view website getting this badge may be impossible for several months; on a website like stack overflow now you can obtain it in a day, and it's relatively easy (compared to other SE sites).  Do you think it would be a good idea to implement a formula that allows the required score to scale? The more active users voting, the more votes are required to get it?  If yes how would you handle people who got it for a post that no longer meets the requirements? Is there BitTorrent software that runs in a terminal? I want to deploy it on my VPS server to download resources quickly.  This could save me a lot of time since some resources are in a foreign country, Suppose $\sum a_n$ converges absolutely and $\sum b_n$ converges. Give an example where the Cauchy product does not converge absolutely. Problem:  Suppose $\sum_{n=0}^{\infty} a_n$ converges absolutely and $\sum_{n=0}^{\infty} b_n$ converges. Give an example where the Cauchy product, defined as $\sum_{n=0}^{\infty} c_n$ where $c_n=\sum_{k=0}^{n} a_k b_{n-k}$, does not converge absolutely.  Question:  I have been scratching my head over this for a while. What would an example be? Which is correct: "one or more is" or "one or more are"?