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Check if directory mounted with bash
...stopher Neylan
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How do I use variables in Oracle SQL Developer?
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edited Jan 15 '13 at 9:49
answered Jan 15 '13 at 8:16
Om...
Sort a Map by values
...rder.
– Carter Page
Jul 1 '12 at 12:46
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@buzz3791 True. That's going to be the case in any sort...
Finding JavaScript memory leaks with Chrome
... Jonathan NaguinJonathan Naguin
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Bash script absolute path with OS X
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edited Aug 26 '10 at 4:48
answered Aug 26 '10 at 4:42
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Using multiple arguments for string formatting in Python (e.g., '%s … %s')
... Mark ByersMark Byers
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Infinity symbol with HTML
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Use the HTML entity ∞ or ∞.
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Lock-free multi-threading is for real threading experts
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edited May 23 '17 at 12:34
community wiki
9 re...
How do I create a URL shortener?
...ou just do a reverse lookup in your alphabet.
e9a62 will be resolved to "4th, 61st, and 0th letter in the alphabet".
e9a62 = [4,61,0] = 4×622 + 61×621 + 0×620 = 1915810
Now find your database-record with WHERE id = 19158 and do the redirect.
Example implementations (provided by commenters)
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Creating an R dataframe row-by-row
...de 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 yet...