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How to implement has_many :through relationships with Mongoid and mongodb?
...ction via another it would still require multiple queries.
https://github.com/mongoid/mongoid/issues/544
Normally if you have a many-many relationship in a RDBMS you would model that differently in MongoDB using a field containing an array of 'foreign' keys on either side. For example:
class Phys...
arrayfun can be significantly slower than an explicit loop in matlab. Why?
...y running other versions of your code. Consider explicitly writing 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...
Cross-platform way of getting temp directory in Python
...om the file
f.close() # temporary file is automatically deleted here
For completeness, here's how it searches for the temporary directory, according to the documentation:
The directory named by the TMPDIR environment variable.
The directory named by the TEMP environment variable.
The directory n...
Singleton by Jon Skeet clarification
... @Anindya: Nope, that's fine. You might want to mail JetBrains to complain though :)
– Jon Skeet
Jul 24 '11 at 7:40
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What is the meaning of symbol $ in jQuery?
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Types in MySQL: BigInt(20) vs Int(20)
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See http://dev.mysql.com/doc/refman/8.0/en/numeric-types.html
INT is a four-byte signed integer.
BIGINT is an eight-byte signed integer.
They each accept no more and no fewer values than can be stored in their respective number of bytes. T...
Convert a float64 to an int in Go
... Such casts have a problem in Go that can be unexpected (at least if you come from Java): "In all non-constant conversions involving floating-point or complex values, if the result type cannot represent the value the conversion succeeds but the result value is implementation-dependent." (golang.or...
How do you loop through currently loaded assemblies?
...ated the dependency on the global static "_dependentAssemblyList", so it becomes thread safe without needing a lock, which has some slight speed advantages if multiple threads are trying to simultaneously determine what assemblies are missing (this is a bit of a corner case).
–...
SQL Server SELECT into existing table
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How do I run a Ruby file in a Rails environment?
...cause you don't need to modify your script.
http://guides.rubyonrails.org/command_line.html#rails-runner
Just say rails runner script.rb
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