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Quickly reading very large tables as dataframes
... read.table
write.table(DT,"test.csv",sep=",",row.names=FALSE,quote=FALSE)
cat("File size (MB):",round(file.info("test.csv")$size/1024^2),"\n")
## File size (MB): 51
system.time(DF1 <- read.csv("test.csv",stringsAsFactors=FALSE))
## user system elapsed
## 24.71 0.15 25.4...
Add Keypair to existing EC2 instance
...have an existing running instance and need to log in to it from a remote location, where I dont have the private key.
– Jus12
Dec 19 '11 at 6:41
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Why would one omit the close tag?
... \?>(?s:.){0,10}\Z Short explanation: changeset.hr/blog/miscellaneous/catch-near-eof-with-regex
– frnhr
Jan 21 '13 at 1:20
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How to find the operating system version using JavaScript?
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Of course (Windows NT 6.2) See this link bitbucket.org/cat_in_136/configuration-mania/src/…
– kaissun
Apr 1 '13 at 15:09
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Why call git branch --unset-upstream to fixup?
... right commit hash from the server and ran the following command locally:
cat .git/refs/remotes/origin/feature/mybranch \
echo 1edf9668426de67ab764af138a98342787dc87fe \
>> .git/refs/remotes/origin/feature/mybranch
s...
How to port data-only volumes from one host to another?
... up: remove exited container used for export and temporary file
docker rm `cat id.tmp` && rm -f id.tmp
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What is an “unwrapped value” in Swift?
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Example:
var canBeNil : Int? = 4
canBeNil = nil
The question mark indicates the fact that canBeNil can be nil.
This would not work:
var cantBeNil : Int = 4
cantBeNil = nil // can't do this
To get the value from your variable if it is optional, you have to unwrap it. This just means putting ...
File input 'accept' attribute - is it useful?
...pes.
Usage
Note: These examples were written based on the current specification and may not actually work in all (or any) browsers. The specification may also change in the future, which could break these examples.
h1 { font-size: 1em; margin:1em 0; }
h1 ~ h1 { border-top: 1px solid #ccc; pa...
Why are these constructs using pre and post-increment undefined behavior?
...avior of actions that wouldn't be needed in high-end number crunching.applications. Rather than try to complicate the Standard...
– supercat
Dec 17 '17 at 23:12
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How many socket connections can a web server handle?
Say if I was to get shared, virtual or dedicated hosting, I read somewhere a server/machine can only handle 64,000 TCP connections at one time, is this true? How many could any type of hosting handle regardless of bandwidth? I'm assuming HTTP works over TCP.
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