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Creating an R dataframe row-by-row
...ode in R.
If you can, allocate your entire data.frame up front:
N <- 1e4 # total number of rows to preallocate--possibly an overestimate
DF <- data.frame(num=rep(NA, N), txt=rep("", N), # as many cols as you need
stringsAsFactors=FALSE) # you don't know levels ye...
Exploitable PHP functions
... community wiki
2 revs, 2 users 92%mario
1
...
How to recover a dropped stash in Git?
...his:
$ git stash pop
[...]
Dropped refs/stash@{0} (2ca03e22256be97f9e40f08e6d6773c7d41dbfd1)
(Note that git stash drop also produces the same line.)
To get that stash back, just run git branch tmp 2cae03e, and you'll get it as a branch. To convert this to a stash, run:
git stash apply tmp
git s...
Generating a random & unique 8 character string using MySQL
...8
MD5(2) = c81e728d9d4c2f636f067f89cc14862c => c81e728d
MD5(3) = eccbc87e4b5ce2fe28308fd9f2a7baf3 => eccbc87e
etc.
caveat: I have no idea how many you could allocate before a collision (but it would be a known and constant value).
edit: This is now an old answer, but I saw it again with ti...
Difference between CLOCK_REALTIME and CLOCK_MONOTONIC?
... away from kernel.org):
https://github.com/torvalds/linux/commit/2aae950b21e4bc789d1fc6668faf67e8748300b7
How to get MD5 sum of a string using python?
... = hashlib.md5()
m.update("000005fab4534d05api_key9a0554259914a86fb9e7eb014e4e5d52permswrite")
print m.hexdigest()
Output: a02506b31c1cd46c2e0b6380fb94eb3d
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...
Pretty git branch graphs
...5d1a14/#da4939, Green: #424e24/#a5c261, Yellow: #6f5028/#ffc66d, Blue: #263e4e/#6d9cbe, Magenta: #3e1f50/#a256c7, Cyan: #234e3f/#62c1a1, and White: #979797/#ffffff.
– Slipp D. Thompson
Mar 21 '12 at 4:12
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Can two different strings generate the same MD5 hash code?
...simple test using very similar binary message in hex string:
$ echo '4dc968ff0ee35c209572d4777b721587d36fa7b21bdc56b74a3dc0783e7b9518afbfa200a8284bf36e8e4b55b35f427593d849676da0d1555d8360fb5f07fea2' | xxd -r -p | tee >/dev/null >(md5) >(sha1sum)
c6b384c4968b28812b676b49d40c09f8af4ed4cc -
...
.gitignore exclude folder but include specific subfolder
...n Thái Ngọc Duy (pclouds) is trying to add this feature:
commit 506d8f1 for git v2.7.0, reverted in commit 76b620d git v2.8.0-rc0
commit 5e57f9c git v2.8.0-rc0,... reverted(!) in commit 5cee3493 git 2.8.0.
So with git 2.9+, this could have actually worked, but was ultimately reverted:
applic...
How to pretty print nested dictionaries?
....__dict__, sort_keys=True, indent=4) #TypeError: <object at 0x0000000002E6A748> is not JSON serializable
– tponthieux
Feb 8 '12 at 23:30
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