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Why do we check up to the square root of a prime number to determine if it is prime?
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13 Answers
13
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Creating a zero-filled pandas data frame
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answered Apr 9 '14 at 13:49
ShravanShravan
1,86322 gold badges1212 silver badges1919 bronze badges
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How to grep a text file which contains some binary data?
...ile through cat -v, e.g
$ cat -v tmp/test.log | grep re
line1 re ^@^M
line3 re^M
which could be then further post-processed to remove the junk; this is most analogous to your query about using tr for the task.
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Definition of a Balanced Tree
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edited Feb 5 '13 at 16:50
answered Feb 5 '13 at 16:30
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Remove querystring from URL
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349
An easy way to get this is:
function getPathFromUrl(url) {
return url.split("?")[0];
}
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Override ActiveRecord attribute methods
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answered Dec 18 '08 at 22:35
Aaron LongwellAaron Longwell
7,80355 gold badges1818 silver badges1010 bronze badges
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Replace only some groups with Regex
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315
A good idea could be to encapsulate everything inside groups, no matter if need to identify th...
Is there a way to ignore header lines in a UNIX sort?
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(head -n 2 <file> && tail -n +3 <file> | sort) > newfile
The parentheses create a subshell, wrapping up the stdout so you can pipe it or redirect it as if it had come from a single command.
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arrayfun can be significantly slower than an explicit loop in matlab. Why?
...ng out the computations, instead of using a function in your loop
tic
Soln3 = ones(T, N);
for t = 1:T
for n = 1:N
Soln3(t, n) = 3*x(t, n)^2 + 2*x(t, n) - 1;
end
end
toc
Time to compute on my computer:
Soln1 1.158446 seconds.
Soln2 10.392475 seconds.
Soln3 0.239023 seconds.
Oli...
How to define a two-dimensional array?
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1039
You're technically trying to index an uninitialized array. You have to first initialize the out...