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MPICH vs OpenMPI
...xtensive optimizations that make it the preferred implementation in nearly all cases.
Feature Support from the Latest MPI Standard
An orthogonal axis to hardware/platform support is coverage of the MPI standard. Here MPICH is usually far and away superior. MPICH has been the first implementation...
How to append rows to an R data frame
...
Not knowing what you are trying to do, I'll share one more suggestion: Preallocate vectors of the type you want for each column, insert values into those vectors, and then, at the end, create your data.frame.
Continuing with Julian's f3 (a preallocated data.frame) as the fastest option so far, def...
How can I pass command-line arguments to a Perl program?
...rbose); # flag
Alternatively, @ARGV is a special variable that contains all the command line arguments. $ARGV[0] is the first (ie. "string1" in your case) and $ARGV[1] is the second argument. You don't need a special module to access @ARGV.
...
“Wrap with try…catch” in IntelliJ?
...ity Guide under the Help menu from time to time. Not only does it tell me all the shortcuts, but it keeps track of how many times I've used each one and when I last used it. I can see how well I'm leveraging the shortcuts.
...
How to make IPython notebook matplotlib plot inline
...rt numpy as np
import matplotlib.pyplot as plt
You can also always start all your IPython kernels in inline mode by default by setting the following config options in your config files:
c.IPKernelApp.matplotlib=<CaselessStrEnum>
Default: None
Choices: ['auto', 'gtk', 'gtk3', 'inline', '...
What is Angular.noop used for?
...laceholder when you need to pass some function as a param.
function foo (callback) {
// Do a lot of complex things
callback();
}
// Those two have the same effect, but the later is more elegant
foo(function() {});
foo(angular.noop);
...
Efficiency of purely functional programming
...ssible asymptotic slowdown that can happen when programming purely functionally as opposed to imperatively (i.e. allowing side-effects)?
...
What does “@private” mean in Objective-C?
... (id)init {
if (self = [super init]) {
other = [[MySecondClass alloc] init];
// Neither MyFirstClass nor MySecondClass provided any
// accessor methods, so if we're going to access any ivars
// we'll have to do it directly, like this:
other->publicNum...
Favourite performance tuning tricks [closed]
...les (possibly archive the deleted records)
Consider doing this automatically once a day or once a week.
Rebuild Indexes
Rebuild Tables (bcp data out/in)
Dump / Reload the database (drastic, but might fix corruption)
Build new, more appropriate index
Run DBCC to see if there is possible corru...
calculating the difference in months between two dates
...or is it more related to an actual span of time? The logic for determining all of these rules is non-trivial, so you'll have to determine your own and implement the appropriate algorithm.
If all you want is simply a difference in the months--completely disregarding the date values--then you can use...