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How to randomize (or permute) a dataframe rowwise and columnwise?
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234
Given the R data.frame:
> df1
a b c
1 1 1 0
2 1 0 0
3 0 1 0
4 0 0 0
Shuffle row-wise:
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Is there a common Java utility to break a list into batches?
...e, partitioning a list containing [a, b, c, d, e] with a partition size of 3 yields [[a, b, c], [d, e]] -- an outer list containing two inner lists of three and two elements, all in the original order.
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In Python, how do you convert seconds since epoch to a `datetime` object?
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answered Sep 12 '10 at 10:33
SilentGhostSilentGhost
246k5454 gold badges286286 silver badges278278 bronze badges
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Overloading member access operators ->, .*
...->() const
{ return * target; }
};
void f() {
client x = { 3 };
proxy y = { & x };
proxy2 z = { & y };
std::cout << x.a << y->a << z->a; // print "333"
}
->*
This one is only tricky in that there is nothing special about it. The non-...
AngularJS - wait for multiple resource queries to complete
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What does the fpermissive flag do?
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edited Jan 12 '12 at 23:25
R. Martinho Fernandes
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Printing all global variables/local variables?
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Why do Java webapps use .do extension? Where did it come from?
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Breaking a list into multiple columns in Latex
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edited Feb 10 '13 at 21:31
worldsayshi
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answered Sep 9 ...