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Force R not to use exponential notation (e.g. e+10)?
... methods listen to some options. Including 'scipen' -- a penalty for scientific display. From help(options):
‘scipen’: integer. A penalty to be applied when deciding to print
numeric values in fixed or exponential notation. Positive
values bias towards fixed and ne...
How do I handle too long index names in a Ruby on Rails ActiveRecord migration?
...id", "subject_type_id"],
:unique => true,
:name => 'my_index'
If using the :index option on references in a create_table block, it takes the same options hash as add_index as its value:
t.references :long_name, index: { name: :my_index }
...
How can I write output from a unit test?
... I have found (with VS2013) that this only prints something if the test is run in debug mode.
– fusi
Sep 24 '15 at 11:15
3
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C# Regex for Guid
...
123}
123)
Regex:
^({)?(\()?\d+(?(1)})(?(2)\))$
The solutions is simplified to match only numbers to show in a more clear way what is required if needed.
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Run command on the Ansible host
...
Yes, you can run commands on the Ansible host. You can specify that all tasks in a play run on the Ansible host, or you can mark individual tasks to run on the Ansible host.
If you want to run an entire play on the Ansible host, then specify hosts: 127.0.0.1 and connection:local in ...
What's the Best Way to Shuffle an NSMutableArray?
If you have an NSMutableArray , how do you shuffle the elements randomly?
12 Answers
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Find objects between two dates MongoDB
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Querying for a Date Range (Specific Month or Day) in the MongoDB Cookbook has a very good explanation on the matter, but below is something I tried out myself and it seems to work.
items.save({
name: "example",
created_at: ISODate("2010-04-30T00:0...
How can I avoid running ActiveRecord callbacks?
...n :do_something_else
skip_callback :validation, :before, :do_something, if: :skip_some_callbacks
skip_callback :validation, :after, :do_something_else, if: :skip_some_callbacks
end
person = Person.new(person_params)
person.skip_some_callbacks = true
person.save
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MySQL query to get column names?
... best way is to use the INFORMATION_SCHEMA metadata virtual database. Specifically the INFORMATION_SCHEMA.COLUMNS table...
SELECT `COLUMN_NAME`
FROM `INFORMATION_SCHEMA`.`COLUMNS`
WHERE `TABLE_SCHEMA`='yourdatabasename'
AND `TABLE_NAME`='yourtablename';
It's VERY powerful, and can give yo...
Best way to initialize (empty) array in PHP
...S3 for example), it has been noted that initializing a new array is faster if done like this var foo = [] rather than var foo = new Array() for reasons of object creation and instantiation. I wonder whether there are any equivalences in PHP?
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