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List comprehension on a nested list?
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answered Aug 6 '13 at 6:05
Andrew ClarkAndrew Clark
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Can someone explain the traverse function in Haskell?
...an also compare it to Foldable, which defines the related function traverse_.
traverse_ :: (Foldable t, Applicative f) => (a -> f b) -> t a -> f ()
So you can see that the key difference between Foldable and Traversable is that the latter allows you to preserve the shape of the struct...
如何获取IE (控件)的所有链接（包括Frameset, iframe） - C/C++ - 清泛网 -...
...接（包括Frameset, iframe）IE 顶层 body 节点通过IHTMLElement->get_all 方法无法获取iframe 里面的节点列表：CComPtr<IHTMLElement> body;...CComPtr<IDispatc...IE 顶层 body 节点通过IHTMLElement->get_all 方法无法获取iframe 里面的节点列表：
CComPtr<IHTMLElement...
Cron and virtualenv
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It's tricky to spot why this fails as /var/log/syslog doesn't log the error details. Best to alias yourself to root so you get emailed with any cron errors. Simply add yourself to /etc/aliases and run sendmail -bi.
More info here:
http://codeinthehole.com/archives/43-Running-django-cronjobs-...
How to compare two floating point numbers in Bash?
...questions/8654051/… e.g. $ echo "1.1+2e+02" | bc (standard_in) 1: syntax error
– Nemo
Feb 2 '16 at 10:55
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pandas resample documentation
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edited May 31 '19 at 10:05
answered Jun 8 '13 at 16:20
Ma...
how to calculate binary search complexity
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Two answers - First one here: Even if there is no error in the math, we can see that 2.43 average is still better than 3.5 average for linear, and this is at a low value. Once you get into the 100s of entries, log2() is much much better than linear. I think you see this ...
How to increase the vertical split window size in Vim
... be pressed
– freeo
Dec 19 '14 at 1:05
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Path of assets in CSS files in Symfony 2
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answered Aug 22 '12 at 5:05
ChocoDeveloperChocoDeveloper
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How can I start PostgreSQL server on Mac OS X?
...t is the result of pg_ctl -D /usr/local/var/postgres status?
Are there any error messages in the server.log?
Make sure tcp localhost connections are enabled in pg_hba.conf:
# IPv4 local connections:
host all all 127.0.0.1/32 trust
Check the listen_addresses and port in postgresql.conf:
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