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How is this fibonacci-function memoized?
... and kept ready in case it is asked for again. If we define some list, xs=[0..] and later ask for its 100th element, xs!!99, the 100th slot in the list gets "fleshed out", holding the number 99 now, ready for next access.
That is what that trick, "going-through-a-list", is exploiting. In normal do...
What's the difference between array_merge and array + array?
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edited Feb 13 at 18:06
Joe DF
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answered Mar...
Append an object to a list in R in amortized constant time, O(1)?
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R>
That works on vectors too, so do I get the bonus points?
Edit (2015-Feb-01): This post is coming up on its fifth birthday. Some kind readers keep repeating any shortcomings with it, so by all means also see some of the comments below. One suggestion for list types:
newlist <- list(ol...
SQL how to increase or decrease one for a int column in one command
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answered Jun 10 '09 at 2:01
gahooagahooa
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Objective-C Split()?
...it strings in objective c into arrays? I mean like this - input string Yes:0:42:value into an array of (Yes,0,42,value)?
5 ...
How can I get nth element from a list?
...re, the operator used is !!.
I.e. [1,2,3]!!1 gives you 2, since lists are 0-indexed.
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An error occurred while installing pg (0.17.1), and Bundler cannot continue
I just installed Rails 4.0.2 and when creating a new app, in the bundle stage I get:
16 Answers
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How do I set a cookie on HttpClient's HttpRequestMessage
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Todd Menier
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answered Sep 11 '12 at 16:57
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How to write a Ruby switch statement (case…when) with regex and backreferences?
... groups are always stored in pseudo variables $1 to $9:
case foo
when /^([0-9][0-9])/
print "the month is #{$1}"
else
print "something else"
end
You can also use the $LAST_MATCH_INFO pseudo variable to get at the whole MatchData object. This can be useful when using named captures:
case ...
How to add texture to fill colors in ggplot2
... Claus Wilke
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answered Jun 10 '10 at 1:08
AndreasAndreas
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