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How can I remove all objects but one from the workspace in R?
I have a workspace with lots of objects and I would like to remove all but one. Ideally I would like to avoid having to type rm(obj.1, obj.2... obj.n) . Is it possible to indicate remove all objects but these ones ?
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How to get current date & time in MySQL?
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You can use NOW():
INSERT INTO servers (server_name, online_status, exchange, disk_space, network_shares, c_time)
VALUES('m1', 'ONLINE', 'exchange', 'disk_space', 'network_shares', NOW())
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The role of #ifdef and #ifndef
...o do something like that with the old #ifdef/#ifndef pair.
#if defined(ORA_PROC) || defined(__GNUC) && __GNUC_VERSION > 300
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Hash and salt passwords in C#
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Actually this is kind of strange, with the string conversions - which the membership provider does to put them into config files. Hashes and salts are binary blobs, you don't need to convert them to strings unless you want to put...
What's the recommended way to connect to MySQL from Go?
... on go-wiki.
Import when using MyMySQL :
import (
"database/sql"
_ "github.com/ziutek/mymysql/godrv"
)
Import when using Go-MySQL-Driver :
import (
"database/sql"
_ "github.com/go-sql-driver/mysql"
)
Connecting and closing using MyMySQL :
con, err := sql.Open("mymysql", datab...
How to prevent browser page caching in Rails
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Finally figured this out - http://blog.serendeputy.com/posts/how-to-prevent-browsers-from-caching-a-page-in-rails/ in application_controller.rb
After Rails 5:
class ApplicationController < ActionController::Base
before_a...
Is Javascript a Functional Programming Language?
...e are closures, and higher order functions, does Javascript deserve to be called a Functional Programming language? The main thing I think it lacks is Pure Functions, and it doesn't 'feel' like other functional languages, like lisp (although thats not really a good reason for it not to be a functio...
CSV file written with Python has blank lines between each row
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@jpmc26 Normally that's good advice, but the csv module doesn't work properly with io.open. There is a unicodecsv 3rd party module for Python 2.7 that works better.
– Mark Tolonen
Feb 26 '18 at 22:...
How to convert AAR to JAR
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The AAR file consists of a JAR file and some resource files (it is basically a standard zip file with a custom file extension). Here are the steps to convert:
Extract the AAR file using standard zip extract (rename it to *.zip to make it easier)
Find the classes.jar file in the extracted files
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Split code over multiple lines in an R script
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Bah, comments are too small. Anyway, @Dirk is very right.
R doesn't need to be told the code starts at the next line. It is smarter than Python ;-) and will just continue to read the next line whenever it considers the statement as "not finished". ...