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How can I loop through a C++ map of maps?
...ions, and avoids unnecessary copies.
Some favour replacing the comments with explicit definitions of reference variables (which get optimised away if unused):
for(auto const &ent1 : mymap) {
auto const &outer_key = ent1.first;
auto const &inner_map = ent1.second;
for(auto const ...
Run ssh and immediately execute command [duplicate]
...; bash -l'
will execute the command and then start up a login shell when it completes. For example:
ssh -t user@domain.com 'cd /some/path; bash -l'
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Exclude .svn directories from grep [duplicate]
...irectory, the results include a lot of files from the .svn directories. Is it possible to recursively grep a directory, but exclude all results from .svn directories?
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How do you round UP a number in Python?
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edited Feb 26 '18 at 9:17
answered Mar 1 '10 at 14:40
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Calculate business days
...tion from the user comments on the date() function page in the PHP manual. It's an improvement of an earlier function in the comments that adds support for leap years.
Enter the starting and ending dates, along with an array of any holidays that might be in between, and it returns the working days ...
Factors in R: more than an annoyance?
... (and most users miss this subtlety). I say they are useful because model fitting packages like lme4 use factors and ordered factors to differentially fit models and determine the type of contrasts to use. And graphing packages also use them to group by. ggplot and most model fitting functions coerc...
Using DISTINCT and COUNT together in a MySQL Query
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edited Sep 8 '14 at 10:19
user3414693
answered Jun 16 '09 at 15:47
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How to do associative array/hashing in JavaScript
I need to store some statistics using JavaScript in a way like I'd do it in C#:
11 Answers
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How do I get the number of elements in a list?
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The len() function can be used with several different types in Python - both built-in types and library types. For example:
>>> len([1,2,3])
3
Official 2.x documentation is here: len()
Official 3.x documentation is here: len()
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Postgres and Indexes on Foreign Keys and Primary Keys
... referencing side of foreign key relationships.
When Pg creates an implicit index it will emit a NOTICE-level message that you can see in psql and/or the system logs, so you can see when it happens. Automatically created indexes are visible in \d output for a table, too.
The documentation on uniq...