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Is gcc std::unordered_map implementation slow? If so - why?
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I found the reason: it is a Problem of gcc-4.7!!
With gcc-4.7
inserts: 37728
get : 2985
With gcc-4.6
inserts: 2531
get : 1565
So std::unordered_map in gcc-4.7 is broken (or my installation, which is an installation of gcc-4.7.0 on Ubuntu - and another ins...
fork() branches more than expected?
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245
The fork() primitive often stretches the imagination. Until you get a feel for it, you should ...
How to change line-ending settings
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The Guy with The Hat
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answered May 2 '12 at 18:12
CodingWithSpikeCodingWithSpike
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Asterisk in function call
...rguments in the function call.
So if uniqueCrossTabs was [ [ 1, 2 ], [ 3, 4 ] ], then itertools.chain(*uniqueCrossTabs) is the same as saying itertools.chain([ 1, 2 ], [ 3, 4 ])
This is obviously different from passing in just uniqueCrossTabs. In your case, you have a list of lists that you wish t...
How do you increase the max number of concurrent connections in Apache?
...ion of MaxClients and MaxRequestsPerChild
http://web.archive.org/web/20160415001028/http://www.genericarticles.com/mediawiki/index.php?title=How_to_optimize_apache_web_server_for_maximum_concurrent_connections_or_increase_max_clients_in_apache
ServerLimit 16
StartServers 2
MaxClients 200
MinSpareT...
How do I make a list of data frames?
...nt 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 frame:
d1
# y1....c.1..2..3. y2....c.4..5..6.
# 1 1 4
# 2 ...
Rails: Default sort order for a rails model?
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554
default_scope
This works for Rails 4+:
class Book < ActiveRecord::Base
default_scope { or...
Can mustache iterate a top-level array?
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edited Feb 11 '13 at 14:35
answered Apr 4 '12 at 15:15
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Fold / Collapse the except code section in sublime text 2
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answered Sep 16 '13 at 3:24
Nir AlfasiNir Alfasi
48.4k1111 gold badges6969 silver badges113113 bronze badges
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What's the difference between RANK() and DENSE_RANK() functions in oracle?
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248
RANK gives you the ranking within your ordered partition. Ties are assigned the same rank, with...