base

istringstream not honoring base?

由 核能气质少年 提交于 2019-12-11 10:30:08
问题 I'm trying to remediate some Coverity findings on tainted values due to the use of atoi and atof . I switched to an istringstream , but its not producing expected results for bases other than 10. If I switch to base 16, enter 0xa and avoid the iss.ignore(2); , then the result is 0: $ ./tt.exe 0xa X: 0 If I switch to base 16, enter 0xa and utilize the iss.ignore(2); , then the result is an exception: $ ./tt.exe 0xa '0xa' is not a value I visited CPP Reference on istringstream as recommended by

Mean of Multiple Columns in R

由 本秂侑毒 提交于 2019-12-11 06:37:58
问题 I am trying take the mean of a list of columns in R and am running into a issue. Let's say I have: A B C D 1 2 3 4 5 6 7 8 9 10 11 12 What I am trying to do is take the mean of columns c(A,C) and save it as a value say (E) as well as the mean of columns c(B,D) and have it save as a different value say F. Is that possible? E F 2 3 6 7 10 11 回答1: Check out dplyr: library(dplyr) df <- df %>% mutate(E=(A+C)/2, F=(B+D)/2) df A B C D E F 1 1 2 3 4 2 3 2 5 6 7 8 6 7 3 9 10 11 12 10 11 回答2: We can

How can I store and use an array of different types derived from a common base type?

由 你说的曾经没有我的故事 提交于 2019-12-11 05:38:13
问题 The title may need a bit of explanation, so here's what i'm trying to do: Common base type for UI elements, e.g. BasePanel More specialised elements can be defined, derived from BasePanel. For example, buttons and textboxes. A list of elements will be stored (of type BasePanel, so that specialised ones can be stored) This list will be looped through each frame and drawn (ignoring optimisation at the moment) Example usage: class UIButton : BasePanel { public override void Draw(blah) { //

Weblogic 12.2.1.3.0静默安装

由 半城伤御伤魂 提交于 2019-12-11 04:42:32
1.创建组 用户 [root@rhel6 Packages]# groupadd weblogic12 [root@rhel6 Packages]# useradd -g weblogic12 weblogic12 2.安装JDK [weblogic12@rhel6 ~]$ tar -zxvf jdk-8u231-linux-x64.tar.gz 3.下载weblogic安装包 解压 https://www.oracle.com/middleware/technologies/weblogic-server-installers-downloads.html [weblogic12@rhel6 ~]$ unzip fmw_12.2.1.3.0_wls_Disk1_1of1.zip Archive: fmw_12.2.1.3.0_wls_Disk1_1of1.zip inflating: fmw_12.2.1.3.0_wls.jar inflating: fmw_12213_readme.htm 4.配置环境变量 export JAVA_HOME=/home/weblogic12/jdk1.8.0_231 export JRE_HOME=/home/weblogic12/jdk1.8.0_231/jre export CLASSPATH=.:$JAVA_HOME/lib/dt.jar

How can I convert a very large integer from one base/radix to another using FFT?

由 与世无争的帅哥 提交于 2019-12-11 02:37:50
问题 Are there known algorithms which will take a big integer with n digits encoded in one base/radix and convert it to another arbitrary base? (Let's say from base 7 to base 19.) n can be really big, like more than 100 000 digits, so I am looking for something better than O( n 2 ) run time. I have seen some algorithms that can multiply two huge integers using the Fast Fourier Transform (FFT), with the theoretical complexity of O( n log n ), where n is the number of digits, so I wonder if

java - Abstract base enum/class for singleton

由 谁说胖子不能爱 提交于 2019-12-11 01:27:32
问题 I've created two enum classes as singleton: public enum A { INSTANCE; public void init(param p1, param p2) { } public void connect() { } public void disconnect() { } public bool isConnected() { } } public enum B { INSTANCE; public void init(param p1) { } public void connect() { } public void disconnect() { } public bool isConnected() { } } As you can see both enum classes are very similar so I was wondering if I should create some kind of base abstract class/enum or interface and then have

Mod_rewrite inclusion problem with css

由 a 夏天 提交于 2019-12-10 23:22:59
问题 I new to mod_rewrite. i have this page profiles.php?page=XXX i tried to move it to more friendly url /cars/XXX/ RewriteEngine on RewriteRule ^cars/([^/]+)/?$ profiles.php?page=$1 [L] problem is when i include style <link href="./css/style.css" rel="stylesheet" type="text/css" /> it doesnt work, <link href="./../../css/style.css" rel="stylesheet" type="text/css" /> works fine, but wont work with profile.php?carname=XXX why is that happening ? how can i fix it Note: I have a small script that

Efficacy of combinging reset and base, instead of building one off the other

由 浪子不回头ぞ 提交于 2019-12-10 21:23:33
问题 Recently I've taken to combining reset and base into one nefarious optimized streamlined smorgasbord. I'm finding it to be a real treat, and wonder if this is common practice. My guess is "no"...and "yes"... That is, I'm under the impression that some programmers get annoyed with reset and like to do everything from scratch. Others like the convenience of a baseline, but they do it first with a reset.css stylesheet, followed with a stylized base.css My new approach has them combined. One

'base' values may only be used to make direct calls to the base implementations of overridden members

由 孤街醉人 提交于 2019-12-10 20:43:11
问题 Why can't I call the base implementation of f here: type Base = abstract f : int -> int -> int default this.f (x : int) (y : int) : int = x + y type Derived = inherit Base override this.f (x : int) (y : int) : int = base.f -x -y The call to base.f elicits this compiler error: error FS0419: 'base' values may only be used to make direct calls to the base implementations of overridden members If I change f to take a single argument then it compiles. Presumably this is something to do with

Visual Studio: Design a UserControl class that derives from an abstract base class

由 谁说我不能喝 提交于 2019-12-10 17:57:09
问题 I want to have an abstract base class for some of my custom UserControl 's. The reason is obvious: they share some common properties and methods (a basic implementation of some elements of an interface actually), and I want to implement them only once. I have done this by defining my abstract base class: public abstract class ViewBase : UserControl, ISomeInterface Then I went to implement one of my views, as usual, with the designer: public partial class SpecialView : UserControl //all OK Up
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