Creating a weekly ts time series object in R

https://stackoverflow.com/questions/22188660/r-time-series-modeling-on-weekly-data-using-ts-object

for a use :

library(lubridate)
data = 1:319
ts(data, freq=365.25/7, start=decimal_date(ymd("2013-1-13")))

Ubuntu cannot get the login page under some wifi captive portals

The following made the fix :
sudo dpkg-reconfigure resolvconf

Install from R command line a package source on disk

install.packages("c:/Users/utsav/Source/Repos/crosstalk/", repos = NULL, type="source")

Rstudio does not see rJava under Ubuntu 12.04

library(rJava) in Rstudio gives the error :

Error : .onLoad failed in loadNamespace() for 'rJava', details:
  call: dyn.load(file, DLLpath = DLLpath, ...)
  error: unable to load shared object '/home/anh/Rlibs/rJava/libs/rJava.so':
  libjvm.so: cannot open shared object file: No such file or directory 

Solution : add
export LD_LIBRARY_PATH=/usr/lib/jvm/java-8-oracle/lib/amd64:/usr/lib/jvm/java-8-oracle/jre/lib/amd64/server

into /etc/bash.bashrc , then run

. /etc/bash.bashrc

then run

sudo R CMD javareconf

then restart Rstudio

Git credential store

If your online git server does not allow ssh (like Microsoft Visual Studio Online), you can store git credentials in a file (not safe)

git config credential.helper store

see https://git-scm.com/docs/git-credential-store

plot multiple columns on the same graph in R with reshape2 and ggplot2

http://stackoverflow.com/questions/9531904/plot-multiple-columns-on-the-same-graph-in-r

s <- span=""> 
"A       B        C       G       Xax
0.451   0.333   0.034   0.173   0.22        
0.491   0.270   0.033   0.207   0.34    
0.389   0.249   0.084   0.271   0.54    
0.425   0.819   0.077   0.281   0.34
0.457   0.429   0.053   0.386   0.53    
0.436   0.524   0.049   0.249   0.12    
0.423   0.270   0.093   0.279   0.61    
0.463   0.315   0.019   0.204   0.23
"
d <- span=""> read.delim(textConnection(s), sep="")

library(ggplot2)
library(reshape2)
d <- span=""> melt(d, id.vars="Xax")

# Everything on the same plot
ggplot(d, aes(Xax,value, col=variable)) + 
  geom_point() + 
  stat_smooth() 

Removing services from system boot

sudo update-rc.d -f postgresql remove
sudo update-rc.d -f mysql remove

or

In the Upstart system:
create a file called sudo vi /etc/init/nginx.override
and put the word "manual" in it.


sudo systemctl disable apache2  (Does not work for 14.04. It's for newer Ubuntu releases)

Stopping/starting nginx web server under Ubuntu 14.04

sudo service nginx start
sudo service nginx stop
sudo service nginx restart

More git commands

git remote show origin
* remote origin
  URL: git://github.com/rails/rails.git
  Remote branch merged with 'git pull' while on branch master
    master
  Tracked remote branches
    1-2-stable 2-0-stable 2-1-stable 2-2-stable 3-0-unstable master

$ git ls-remote --heads origin
5b3f7563ae1b4a7160fda7fe34240d40c5777dcd  refs/heads/1-2-stable
71926912a127da29530520d435c83c48778ac2b2  refs/heads/2-0-stable

$git log --decorate=full
$git log --decorate=full --pretty=oneline

#If I made a hard reset to a previous commit (but I had already pushed last commit), then I have to make a forced push:

$git reset --hard a9355ba42f5418c
$git push origin HEAD --force  #Erases in the online server the last commit

Adding source to an empty remote git account

Set up your local directory

Set up Git on your machine if you haven't already.

mkdir /path/to/your/projectcd /path/to/your/projectgit initgit remote add origin git@bitbucket.org:xxx/xxx.git

Create your first file, commit, and push

git commit -m 'Initial commit with contributors'git push -u origin master

rJava installation problem : libjvm.so: cannot open shared object file: No such file or directory

export LD_LIBRARY_PATH=/usr/lib/jvm/java-8-oracle/jre/lib/amd64/server
or
export LD_LIBRARY_PATH=/usr/lib/jvm/java-8-oracle/jre/lib/amd64/server

then 
R CMD javareconf
or
R CMD javareconf -e

from : http://askubuntu.com/questions/584529/libjvm-so-cannot-open-shared-object-file-no-such-file-or-directory

git pulling the upstream changes (repo forked from Github)

First set the upstream repo (done only once)

git remote add upstream git://github.com/pjhyett/github-services.git

Then everytime you want to pull/fetch

git fetch upstream

or

git pull upstream

Removing rows with NAs in R

http://stackoverflow.com/questions/4862178/remove-rows-with-nas-in-data-frame

Basically : use complete.cases() and na.omit()

Eclipse luna crashes on new project in Kubuntu 14.04

http://askubuntu.com/questions/537216/eclipse-luna-crashes-on-new-project-in-kubuntu-14-04

2down voteaccepted

As indicated in Eclipse auto shutdowns when creating new project one workaround to this bug is to change the GTK2 theme in System Preferences -> Application Appearance -> GTK (I personally useAurora: sudo apt-get install -y gtk2-engines-aurora). Alternatively, a patch to oxygen is available here, and has been pushed to the active development branch of oxygen. oxygen-gtk2-1.4.6-1 should be OK but as of now oxygen-gtk2-1.4.5 is still the most recent stable version.

Fixing Wordpress post permalinks on Ubuntu localhost

Installing wordpress on a fresh local install on my machine, post permalinks with post name does not work. To enable that :

1. Enable mod_rewrite for apache

cd /etc/apache2/mods-enabled/
sudo ln -s ../mods-available/rewrite.load

2. Enable AllowOverride for apache

sudo vi /etc/apache2/apache2.conf 

        Options Indexes FollowSymLinks

        AllowOverride All

Loading big data to PostGIS with shp2pgsql

From http://doublebyteblog.wordpress.com/2014/08/06/importing-large-spatial-dataset-into-postgis/

Looks like the -D switch is wital :
shp2pgsql -D -s 4326 data.shp import_shp2pgsql | psql

Fix Adobe Flash Player Issue In Chromium In Ubuntu 14.04

from http://itsfoss.com/fix-flash-player-issue-chromium-in-ubuntu-14-04/ :

sudo apt-get install pepperflashplugin-nonfree

sudo update-pepperflashplugin-nonfree --install

Cannot restart ftp under PLESK

$ ftp myftpserver.whatever Connected to myftpserver.whatever. 500 FTP server shut down (going down at Wed Dec 11 20:05:15 2002) -- please try again later.

See if you have a file called /etc/shutmsg. If you do, delete it, and the server should let you in.

This is a ProFTPD FAQ (http://proftpd.linux.co.uk/docs/faq/linked/faq-ch4.html#AEN446).

To disable ftp service under PLESK

In file /etc/xinetd.d/ftp_psa change

disable = no

to

disable = yes

and restart xinetd sevice : restart xinetd

Wordpress multisite with subdomains under PLESK 10.4

I have wordpress multisite (network of Wordpress) running in subdomain mode. The main site is abc.net and the sub-blog has its own domain name xyz.com. How to configure that under PLESK 10.4?

1. Create a WP network with subdomains following the instructions.
2. Creat a new subdomain called site1.abc.net. Note its ID. In my case, ID=2.
3. Download and network enable the plugin Wordpress MU Domain Mapping.
4. Use this plugin to map the subdomain ID=2 to xyz.com
5. Enable the subdomain wildcards under PLESK (under abc.net, add a subdomain named *.abc.net, pointing to the same directory that hosts the WP network installation (in my case, /httpdocs). After this step, site1.abc.net is available.
6. If you want the subplog to have its own DN rather than site1.abc.net, follow the steps below:
7. Purchase a DN and point it to the DN server that manages the server hosting the WP network (and that has PLESK).
8. Under PLESK, chose the webspace of the main domain (abc.net), chose "Website & Domains" and chose "Add New Domain Alias", enter xyz.net as an alias to abc.net.
9. WP MU Domain Mapping Plugin takes care of the rest.

Now my subblog has its own domain name! Yippie!