大约有 43,700 项符合查询结果（耗时：0.0361秒） [XML]
How do I make a list of data frames?
... function call. If you use <-, you'll end up creating variables y1 and y2 in whatever environment you're working in:
d1 <- data.frame(y1 <- c(1, 2, 3), y2 <- c(4, 5, 6))
y1
# [1] 1 2 3
y2
# [1] 4 5 6
This won't have the seemingly desired effect of creating column names in the data fra...
Remove all occurrences of a value from a list?
...
23 Answers
23
Active
...
How to update gradle in android studio?
I installed Android Studio 0.1.9. Today I got and update to version 0.2 and of course I updated. After the installation I restarted Android Studio but now I get this message:
...
How do I calculate square root in Python?
...
249
sqrt=x**(1/2) is doing integer division. 1/2 == 0.
So you're computing x(1/2) in the first in...
Eclipse RCP Plug-in开发自学教程（Eclipse3.6） - 文档下载 - 清泛网 - ...
...受益，也希望大家能有版本意识，转载时注明来自salever@126.com。
之前有一套基于Eclipse3.3版本的教程，也是本人整理，由于本人的疏忽，导致网络上的版本各不相同，但分享已久，无法改变，希望大家谅解并使用新版本的教程...
Simple regular expression for a decimal with a precision of 2
What is the regular expression for a decimal with a precision of 2?
17 Answers
17
...
Remove duplicated rows
...
192
just isolate your data frame to the columns you need, then use the unique function :D
# in the...
jQuery animate backgroundColor
... own min version. YUI gets the best compression in this case needing only 2317 bytes and since it is so small - here it is:
(function (d) {
d.each(["backgroundColor", "borderBottomColor", "borderLeftColor", "borderRightColor", "borderTopColor", "color", "outlineColor"], function (f, e) {
...
Format number to always show 2 decimal places
I would like to format my numbers to always display 2 decimal places, rounding where applicable.
30 Answers
...