importance of samples in regression In regression analysis it could happen that some samples are more relevant than others (i.e. they are more important in understanding the underlying model). Is there any technique to train a regressor by weighting training samples according to their relevance? A trivial example could be giving 0 weight to outliers.
Include prior knowledge in regression model I've a classical dataset with real attributes and I want to perform a regression.  But, not all the entries in the training dataset are trustworthy; there is an attribute that I can turn into a confidence value (between 0 and 1) to say how much I can trust the label value. For example, if the confidence value is 0, I mustn't take the entry into consideration.  Is there a way to do this?
Why does an object with a glossy shader render in black? When I apply a glossy shader to the material of my text, the text becomes just black. Why?    I have lamp and everything, but the problem persists. The text is red before I add the glossy shader.  I'm using Cycles render.   Thanks! Animations about a young man pulled into a fantasy setting with dragons? I'm looking for an animation (more likely a film not a series) that I watched as a kid, watched early 90's I'm sure it contained a book loving male main character (wears glasses might have even had an amulet) who gets pulled into a fantasy via a magic book  Setting with dragons and an evil wizard, I remember it being on TV as I never had it on VHS.  Same sort of animation technique as visionaries or thundercats.  Thanks. The keyboard on my laptop seems to be typing by itself:   It sometimes types characters like 134, whether by itself or when I hit certain keys. Repeating characters may appear unexpectedly. The system volume may change by itself, or windows like the Print dialog or Web browser may appear.   This can happen without any input or as I type, and may occur more often when certain keys are pressed. Sometimes, the keyboard fails to respond altogether. This is happening regardless of the software involved.  Is there a ghost in my keyboard—is my keyboard broken?  A sample of text from the keyboard might look like this (normal QWERTY...ASDF...ZXC... sequence is expected):   QWERTYUIOPASDF)(G@*HKLZXCVBN QWERTYIOPASDFGL!#ZXCVB13 QWERTYUIOPASDFGHJKLZXCVB!#N qwertyu41iopasdf19g13h28j113k4113zxcvb4n qwerty4u1iopasdf0g7h1jklzxcvb13m qwert13uuuuuuuuuuuuuuuiopasdf87091134ghhhhhhhhhhhhhhhhhhhhhhh13jk13zxcvb14      This question comes up often and the answers are usually the same. This post is meant to provide a definitive, canonical answer for this problem. Feel free to edit the answer to add additional details. Are we discouraged from fixing typos and misspellings on Stack Exchange sites? I just attempted to fix a typo on a question on cooking.stackexchange.com and saw this     Oops! Your edit couldn't be submitted because:         Your edit summary must be at least 10 characters   This edit is less than 6 characters; surely more can be improved with your edit?      So, misspelled words have to just be left misspelled?  That could prevent the post from being found in a search. If RSA is limited to 117-200 bytes or so, is that a very limited use case? Am I missing something, or is RSA very very limiting when it comes to ecrypting data when it comes to the actual message size?  I have read that you can only encrypt a message of around 117 to 200 bytes in size (depending on your key size: 1024 or 2048 bits). Is this correct?  If so, I think I have read people suggesting on using it for larger files. I guess they are just repeating the process many times over and over in blocks of 117 bytes? How to convert a list of string to a list of int I changed my username and now I cannot play online I don't understand this and I'm now worried as I have donated to a lot of servers and I don't want to lose this account. On the launcher it says my new username but when I log on it says "Account not Authenticated with minecraft.net" and "Non-Valid Username".  How can I regain the ability to use my account online? "reflect" vs "reflection on" or "reflection of" The bride's elegant dress reflected her good taste. The bride's elegant dress is a reflection on her good taste. The bride's elegant dress is a reflection of her good taste.  Would you tell me if they mean the same thing? If they would mean the same thing, what about the following question--link--? or I mean how could we distinguish such a distinction between these functions? Similarly, what about these:  A student's grades reflected her teacher A student's grades are a reflection on her teacher A student's grade are a reflection of her teacher  When, where or in which situation don't they mean the same? How can we distinguish such a distinction? What is the value of $\sum\limits_{i=1}^\infty\frac{1}{p_{p_i}}$ where $p_{i}$ is the $i$th prime? Draft mode for pgfplots I'm working on a fairly big document that has a lot of graphs of functions- so far it has around 200, by the end it will have around 1500. I use pgfplots for each graphic, and the functions are pretty basic: exponential, rational, polynomial, and trigonometric.  Once I am happy with each graph, I don't necessarily need to see it every time I compile, and would like to minimize compilation time for future drafts. Naturally, the document is already chopped up into chapter files, but each chapter contains around 100 figures.  Having studied the pgfplots documentation, I haven't found a draft mode, but I'm interested in knowing if one could be created.    I'm envisaging something similar to the draft mode of the graphicx package, in which graphics are not included, and blank boxes are put in their place.  Some things I've considered:   the  documentclass; but with about 1500 figures, wouldn't this mean over-modulization?  tikzexternalize, but this still requires an initial 'monster' compilation to get the images externalized before the draft option could be invoked   Here's a MWE to play with  \documentclass{article} \usepackage{pgfplots}  \begin{document}  \begin{tikzpicture}     \begin{axis}         \addplot {x^2};     \end{axis} \end{tikzpicture}  \end{document} 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;} } Multi armed bandit for general reward distribution Regular expression to match a line that doesn't contain a word I know it's possible to match a word and then reverse the matches using other tools (e.g. grep -v). However, is it possible to match lines that do not contain a specific word, e.g. hede, using a regular expression?   Input:  hoho hihi haha hede   Code:  grep "&lt;Regex for 'doesn't contain hede'&gt;" input   Desired output:  hoho hihi haha Should I use  tag for icons instead of ? Finding what methods a Python object has I have a script that needs to do some stuff based on file creation &amp; modification dates but has to run on Linux &amp; Windows.  What's the best cross-platform way to get file creation &amp; modification date/times in Python? I have come across these three definitions of the limit superior (or upper limit) and the limit inferior (or lower limit) of a sequence of real numbers and I wonder how to establish the equivalence of these.    Walter Rudin: PRINCIPLES OF MATHEMATICAL ANALYSIS, 3rd edition:  Definition 3.16: Given a sequence $\{s_n\}$ of real numbers, let $E$ be the set of numbers $x$ (in the extended real number system) such that $s_{n_k} \to x$ for some subsequence $\{s_{n_k}\}$. This set contains all subsequential limits ..., plus possibly the numbers $+\infty$, $-\infty$. We now ... put  $$s^{*} = \sup E,$$ $$s_{*} = \inf E.$$ The numbers $s^{*}$, $s_{*}$ are called the upper and lower limits of $\{s_n\}$; we use the notation  $$ \lim_{n \to \infty} \sup s_n = s^{*}, \, \, \, \lim_{n \to \infty} \inf s_n = s_{*}.$$ Tom M. Apostol: MATHEMATICAL ANALYSIS, 2nd edition:  Sec. 8.3: Definition 8.2: Let $\{a_n\}$ be a sequence of real numbers. Suppose there is a real number $U$ satisfying the following conditions:    i} For every $\epsilon &gt; 0$ there exists an integer $N$ such that $n &gt; N$ implies $$a_n &lt; U + \epsilon.$$ ii) Given $\epsilon &gt; 0$ and given $m &gt; 0$, there exists an integer $n&gt; m$ such that $$a_n &gt; U - \epsilon.$$ Then $U$ is called the limit superior (or upper limit) of $\{a_n\}$, and we write $$U = \lim_{n \to \infty} \sup a_n.$$ Statement (i) implies that the set $\{a_1, a_2, a_3, \ldots \}$ is bounded above. If this set is not bounded above, we define $$\lim_{n\to\infty}\sup a_n = +\infty.$$ If the set is bounded above but not bounded below and if $\{a_n\}$ has no finite limit superior, then we say $\lim \sup_{n\to\infty} a_n = -\infty$. The limit inferior (or lower limit) of $\{a_n\}$ is defined as follows: $$\lim_{n\to\infty}\inf a_n = -\lim_{n\to\infty}\sup b_n,$$ where $b_n = -a_n$ for $n= 1, 2, 3, \ldots$.    Robert G. Bartle and Donald R. Sherbert: INTRODUCTION TO REAL ANALYSIS, 3rd edition: Exercises for Section 3.3: Problem 10: Let $(x_n)$ be a bounded sequence of real numbers, and for each $n\in \mathbb{N}$ let $s_n \colon= \sup \{x_k \colon k \geq n\}$ and let $t_n \colon= \inf \{x_k \colon k \geq n\}$. Prove that $(s_n)$ and $(t_n)$ are monotone and convergent. Also prove that if $\lim (s_n) = \lim (t_n)$, then $(x_n)$ is convergent. [One calls $\lim (s_n)$ the limit superior of $(x_n)$ and $\lim (t_n)$ the limit inferior of $(x_n)$.]   Now how can one show that the above three definitions are equivalent (i.e. these three definitions are of the same pair of numbers)? What was Mr. Anderson (Neo) selling on discs to Choi? unsigned int vs. size_t I notice that modern C and C++ code seems to use size_t instead of int/unsigned int pretty much everywhere - from parameters for C string functions to the STL.  I am curious as to the reason for this and the benefits it brings. Search results showing questions without the searched for tag in results Recently, I was surfing on stackoverflow.com &amp; I have found one bug in Question filter.  I was looking under the java tag and yet I saw questions which were not tagged java    The incorrectly shown question was