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Get difference between two lists
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In [5]: list(set(temp1) - set(temp2))
Out[5]: ['Four', 'Three']
Beware that
In [5]: set([1, 2]) - set([2, 3])
Out[5]: set([1])
where you might expect/want it to equal set([1, 3]). If you do want set([1, 3]) as your answer,...
Scala: Abstract types vs generics
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257
You have a good point of view on this issue here:
The Purpose of Scala's Type System
A Conve...
Converting Dictionary to List? [duplicate]
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156
Your problem is that you have key and value in quotes making them strings, i.e. you're setting ...
Merge and interleave two arrays in Ruby
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answered Sep 5 '11 at 21:15
DigitalRossDigitalRoss
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What is Ember RunLoop and how does it work?
...: https://machty.s3.amazonaws.com/ember-run-loop-visual/index.html
Update 5/9/2013: all the basic concepts below are still up to date, but as of this commit, the Ember Run Loop implementation has been split off into a separate library called backburner.js, with some very minor API differences.
Fir...
Accessing members of items in a JSONArray with Java
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edited Nov 9 '18 at 23:53
idewz
544 bronze badges
answered Oct 14 '09 at 20:32
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How can Perl's print add a newline by default?
... say function that automatically appends \n.
You can also use say in Perl 5.10 or 5.12 if you add
use feature qw(say);
to the beginning of your program. Or you can use Modern::Perl to get this and other features.
See perldoc feature for more details.
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load and execute order of scripts
...synchronously in Opera and pre-4.0 Firefox.
The relevant part of the HTML5 spec (for newer compliant browsers) is here. There is a lot written in there about async behavior. Obviously, this spec doesn't apply to older browsers (or mal-conforming browsers) whose behavior you would probably have t...
How useful/important is REST HATEOAS ( maturity level 3)?
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5 Answers
5
Active
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Apply a function to every row of a matrix or a data frame
..., byrow=TRUE)
R> M
[,1] [,2]
[1,] 1 2
[2,] 3 4
[3,] 5 6
R> apply(M, 1, function(x) 2*x[1]+x[2])
[1] 4 10 16
R>
This takes a matrix and applies a (silly) function to each row. You pass extra arguments to the function as fourth, fifth, ... arguments to apply().
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