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How do I check if a C++ std::string starts with a certain string, and convert a substring to an int?
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edited Jun 1 at 16:48
Arthur Tacca
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answe...
Find the day of a week
...r way...
The wday component of a POSIXlt object is the numeric weekday (0-6 starting on Sunday).
as.POSIXlt(df$date)$wday
## [1] 3 3 4
which you could use to subset a character vector of weekday names
c("Sunday", "Monday", "Tuesday", "Wednesday", "Thursday",
"Friday", "Saturday")[as.POSIXl...
List of ANSI color escape sequences
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568
The ANSI escape sequences you're looking for are the Select Graphic Rendition subset. All of th...
design a stack such that getMinimum( ) should be O(1)
... Min stack
5 --> TOP 1
1 1
4 2
6 2
2 2
After popping twice you get:
Real stack Min stack
4 2
6 2
2 2
Please let me know if this isn't enough information. It's simp...
Remove columns from dataframe where ALL values are NA
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160
Try this:
df <- df[,colSums(is.na(df))<nrow(df)]
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Why use apparently meaningless do-while and if-else statements in macros?
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edited Jun 15 '14 at 18:26
Pavel
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answered Sep 3...
Drawing an SVG file on a HTML5 canvas
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EDIT Dec 16th, 2019
Path2D is supported by all major browsers now
EDIT November 5th, 2014
You can now use ctx.drawImage to draw HTMLImageElements that have a .svg source in some but not all browsers. Chrome, IE11, and Safari work, Fire...
How to style the option of an html “select” element?
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216
There are only a few style attributes that can be applied to an <option> element.
This is...
win7 安装项目管理工具redmine2.5.1 - 开源 & Github - 清泛网 - 专注C/C++及内核技术
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redmine-2.5.1.zip
railsinstaller-2.2.2.exe
mysql-installer-community-5.6.17.0.msi
ImageMagick-6.8.9-2-Q16-x86-dll.exe
mysql2-0.3.16.gem
mysql-connector-c-6.1.3-win32.zip
rmagick-2.13.1-x86-mingw32.gem
windows下建议全部下载32位版本的软件，windows下的依赖解决太痛苦...
Reusable library to get human readable version of file size?
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536
Addressing the above "too small a task to require a library" issue by a straightforward implemen...