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What does -XX:MaxPermSize do?
...umentation lists the other HotSpot arguments.
Update : Starting with Java 8, both the permgen space and this setting are gone. The memory model used for loaded classes and methods is different and isn't limited (with default settings). You should not see this error any more.
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How to concatenate strings of a string field in a PostgreSQL 'group by' query?
...SELECT string_agg(actor_name, ', ' ORDER BY first_appearance)
PostgreSQL 8.4 or later:
PostgreSQL 8.4 (in 2009) introduced the aggregate function array_agg(expression) which concatenates the values into an array. Then array_to_string() can be used to give the desired result:
SELECT company_id, a...
How to put an image in div with CSS?
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Dany YDany Y
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Scala downwards or decreasing for loop?
...la> 10 to 1 by -1
res1: scala.collection.immutable.Range = Range(10, 9, 8, 7, 6, 5, 4, 3, 2, 1)
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Truncate a list to a given number of elements
...ve Jarvis
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answered Aug 14 '09 at 18:42
Ben LingsBen Lings
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Make page to tell browser not to cache/preserve input values
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answered Apr 23 '10 at 14:38
DisgruntledGoatDisgruntledGoat
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How to undo a git merge with conflicts
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1386
Latest Git:
git merge --abort
This attempts to reset your working copy to whatever state it ...
Validating IPv4 addresses with regexp
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answered Mar 12 '11 at 18:08
Mark ByersMark Byers
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Base64 length calculation?
... of 4, so 1, 2 or 3 input bytes => 4 chars; 4, 5 or 6 input bytes => 8 chars; 7, 8 or 9 input bytes => 12 chars.
– Paul R
Nov 14 '12 at 13:17
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Looping over a list in Python
...ur len(x) should be equal to 3.
>>> mylist = [[1,2,3],[4,5,6,7],[8,9,10]]
>>> for x in mylist:
... if len(x)==3:
... print x
...
[1, 2, 3]
[8, 9, 10]
or if you need more pythonic use list-comprehensions
>>> [x for x in mylist if len(x)==3]
[[1, 2, 3], [8, ...