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What's the fastest way to merge/join data.frames in R?
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library(plyr)
library(data.table)
library(sqldf)
set.seed(123)
N <- 1e5
d1 <- data.frame(x=sample(N,N), y1=rnorm(N))
d2 <- data.frame(x=sample(N,N), y2=rnorm(N))
g1 <- sample(1:1000, N, replace = TRUE)
g2<- sample(1:1000, N, replace = TRUE)
d <- data.frame(d1, g1, g2)
library(...
iPhone App 开发第一步：从零到真机调试HelloWorld - 更多技术 - 清泛网 - ...
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darwin_snow_legacy.iso：http://hot23.down.115.com/gdown_hot23/66/57/b719b7af17d97f760c736f6dc0685ceeff2c46fd/darwin_snow_legacy.iso.zip?k=MEuv7WsAjBPuNF1RX59oyw&t=1340183926&u=1034306809-4fe18e0d3f6b71340182029-bl9i4xuo&s=51200&file=darwin_snow_legacy.iso.zip
Rebel EFI.iso：thunder://Q...
Writing to output window of Visual Studio
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This is my test code; pastebin.com/b7P0bYEa It is pretty simple but still nothing. I will try it on another system.
– previous_developer
Feb 27 '12 at 16:24
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What is the significance of ProjectTypeGuids tag in the visual studio project file
...BCC9-BB4BC16C2548}
XNA (Windows) {6D335F3A-9D43-41b4-9D22-F6F17C4BE596}
XNA (XBox) {2DF5C3F4-5A5F-47a9-8E94-23B4456F55E2}
XNA (Zune) {D399B71A-8929-442a-A9AC-8BEC78BB2433}
Silverlight {A1591282-1198-4647-A2B1-27E5FF5F6F3B}
ASP.NET MVC {F85E285D-...
How to set up a PostgreSQL database in Django
... community wiki
20 revs, 3 users 96%Alireza Savand
2
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How do I find where an exception was thrown in C++?
...cktrace returned 10 frames
[bt]: (0) ./test(my_terminate__Fv+0x1a) [0x8048e52]
[bt]: (1) /usr/lib/libstdc++-libc6.2-2.so.3 [0x40045baa]
[bt]: (2) /usr/lib/libstdc++-libc6.2-2.so.3 [0x400468e5]
[bt]: (3) /usr/lib/libstdc++-libc6.2-2.so.3(__rethrow+0xaf) [0x40046bdf]
[bt]: (4) ./test(throw_exception_...
Rails Root directory path?
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source:
https://github.com/rails/rails/blob/5259062868dcf10fbcf735d6520e6a14e15fdcdb/actionmailer/test/abstract_unit.rb#L12
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Git 工具 - 子模块(submodule)：一个仓库包含另一个仓库 - 开源 & Github -...
... path 'vendor/plugins/demo': checked out '48679c6302815f6c76f1fe30625d795d9e55fc56'
$ git status
On branch master
Your branch is up-to-date with 'origin/master'.
nothing to commit, working tree clean
请注意，为安全起见，如果 MainProject 提交了你刚拉取的新子模块...
App Inventor 2 接入百度网盘API · App Inventor 2 中文网
...095c67?fid=2584198580-250528-1737895653506&rt=pr&sign=FDtAERV-DCb740ccc5511e5e8fedcff06b081203-l1%2FQEmhrWYz44QzUHHhKQpLLZfk%3D&expires=8h&chkbd=0&chkv=3&dp-logid=2874731127723614236&dp-callid=0&dstime=1697013275&r=649469325&origin_appid=[AppID]&file_type=0
注意：这个dlink可以在浏览器...
Extracting numbers from vectors of strings
...gexpr puts it between Andrew's and Arun's solutions (second fastest) on a 1e6 set. Perhaps also interesting, using sub in Andrew's solution does not improve the speed.
– Matthew Lundberg
Jan 27 '13 at 16:42
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