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How to express a NOT IN query with ActiveRecord/Rails?
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316
Rails 4+:
Article.where.not(title: ['Rails 3', 'Rails 5'])
Rails 3:
Topic.where('id NOT I...
How do I list all versions of a gem available at a remote site?
...c --remote --all
Which returns:
*** REMOTE GEMS ***
rhc (0.84.15, 0.84.13, 0.83.9, 0.82.18, 0.81.14, 0.80.5, 0.79.5, 0.77.8, 0.75.9, 0.74.6, 0.74.5, 0.73.14, 0.72.29, 0.71.2, 0.69.6, 0.69.3, 0.68.5)
rhcp (0.2.18, 0.2.17, 0.2.16, 0.2.15, 0.2.14, 0.1.9, 0.1.8, 0.1.7, 0.1.6, 0.1.5, 0.1.4, 0.1.3, 0.1...
read subprocess stdout line by line
... Rômulo CecconRômulo Ceccon
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11
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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...
Understanding the ngRepeat 'track by' expression
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3 Answers
3
Active
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Difference between len() and .__len__()?
Is there any difference between calling len([1,2,3]) or [1,2,3].__len__() ?
4 Answers
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How to change variables value while debugging with LLDB in Xcode?
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3 Answers
3
Active
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How to loop backwards in python? [duplicate]
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302
range() and xrange() take a third parameter that specifies a step. So you can do the following...
How to do this using jQuery - document.getElementById(“selectlist”).value
...LOL.
– Jacob Relkin
Mar 10 '11 at 0:30
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