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Are lists thread-safe?
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Why is rbindlist “better” than rbind?
...get in a muddle of rownames using do.call(rbind, list(...))
see
How to avoid renaming of rows when using rbind inside do.call?
Memory efficiency
In terms of memory rbindlist is implemented in C, so is memory efficient, it uses setattr to set attributes by reference
rbind.data.frame is implemen...
How can I use a Python script in the command line without cd-ing to its directory? Is it the PYTHONP
...ctories are silently ignored.
In addition to normal directories, individual PYTHONPATH entries may
refer to zipfiles containing pure Python modules (in either source or
compiled form). Extension modules cannot be imported from zipfiles.
The default search path is installation dependent...
How to create a density plot in matplotlib?
...you generated with R. This is because gaussian_kde tries to infer the bandwidth automatically. You can play with the bandwidth in a way by changing the function covariance_factor of the gaussian_kde class. First, here is what you get without changing that function:
However, if I use the following...
What is the apply function in Scala?
...t works the other way too - every object can be treated as a function, provided it has the apply method. Such objects can be used in the function notation:
// we will be able to use this object as a function, as well as an object
object Foo {
var y = 5
def apply (x: Int) = x + y
}
Foo (1) // ...
Chaining multiple filter() in Django, is this a bug?
...ries/#spanning-multi-valued-relationships
particularly:
Everything inside a single filter() call is applied simultaneously to filter out items matching all those requirements. Successive filter() calls further restrict the set of objects
...
In this second example (filter(A).filter(B)), ...
Python: Select subset from list based on index set
...this kind of selection is very powerful, especially when nested and/or multidimensional.
– Thomas Browne
May 25 '14 at 21:11
...
What is an EJB, and what does it do?
...and
sharing common state across client callers. This can be easily over-ridden to manually
configure or programmatically control advanced scenarios for concurrent code execution
and data access.
Automated transaction handling.
Do nothing at all and all your EJB methods are run
in a JTA transact...
Groovy: what's the purpose of “def” in “def x = 0”?
... }
}
bar()
prints "error caught"
The "y" variable isn't in scope inside the function. "x" is in scope as groovy will check the bindings of the current script for the variable. As I said earlier, this is simply syntactic sugar to make quick and dirty scripts quicker to type out (often one li...
How do you loop through currently loaded assemblies?
...lt;/summary>
public static class GetReferencedAssemblies
{
static void Demo()
{
var referencedAssemblies = Assembly.GetEntryAssembly().MyGetReferencedAssembliesRecursive();
var missingAssemblies = Assembly.GetEntryAssembly().MyGetMissingAssembliesRecursive();
// Ca...