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Simple regular expression for a decimal with a precision of 2
... be limited to a precision of 2:
\d+(\.\d*)?|\.\d+
The latter matches
1
100
100.
100.74
100.7
0.7
.7
.72
And it doesn't match empty string (like \d*.?\d* would)
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...
Remove duplicated rows
... unique(DF) 44708.230 48981.8445 53062.536 51573.276 52844.591 107032.18 100 b
# unique(DT) 746.855 776.6145 2201.657 864.932 919.489 55986.88 100 a
microbenchmark(duplicated(DF), duplicated(DT))
# Unit: microseconds
# expr min lq mean median ...
Truncate a list to a given number of elements
What method truncates a list--for example to the first 100 elements--discarding the others (without iterating through individual elements)?
...
How do I round to the nearest 0.5?
...est 10 = 110
// 105.5 up to nearest 7 = 112
// 105.5 up to nearest 100 = 200
// 105.5 up to nearest 0.2 = 105.6
// 105.5 up to nearest 0.3 = 105.6
//if no rounto then just pass original number back
if (roundto == 0)
{
return passednumber;
}
else
{
...
reformat in vim for a nice column layout
...t the macro for all remaining lines.
Copy/pasted from that answer:
qa0f:w100i <Esc>19|dwjq4@a
Note the single space after the 100i, and the <Esc> means "press escape"--don't type "<Esc>" literally.
Translation:
qa -- record macro in hotkey a
0 -- go to beginn...
Is there a reason that we cannot iterate on “reverse Range” in ruby?
...
100
A range is just that: something defined by its start and end, not by its contents. "Iterating"...
Nginx url重写rewrite实例详解 - 更多技术 - 清泛网 - 专注IT技能提升
...e *.test.com;
root /usr/local/www;
#这是里可以加多个目录,如果不加目录，会无法访问到http://www.jbyuan.com/nvxingjiankang/目录下的文件,如图片目录/images
location ~ ^/(test|images|styles)/
{
proxy_redirect off...
Nginx url重写rewrite实例详解 - 更多技术 - 清泛网 - 专注IT技能提升
...e *.test.com;
root /usr/local/www;
#这是里可以加多个目录,如果不加目录，会无法访问到http://www.jbyuan.com/nvxingjiankang/目录下的文件,如图片目录/images
location ~ ^/(test|images|styles)/
{
proxy_redirect off...
Nginx url重写rewrite实例详解 - 更多技术 - 清泛网 - 专注IT技能提升
...e *.test.com;
root /usr/local/www;
#这是里可以加多个目录,如果不加目录，会无法访问到http://www.jbyuan.com/nvxingjiankang/目录下的文件,如图片目录/images
location ~ ^/(test|images|styles)/
{
proxy_redirect off...
Nginx url重写rewrite实例详解 - 更多技术 - 清泛网 - 专注IT技能提升
...e *.test.com;
root /usr/local/www;
#这是里可以加多个目录,如果不加目录，会无法访问到http://www.jbyuan.com/nvxingjiankang/目录下的文件,如图片目录/images
location ~ ^/(test|images|styles)/
{
proxy_redirect off...