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Recent Comments
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RLangTip
Get an overview of documentation for an installed package: help(package="<package-name>") #rstats
Common style for comments is # on a line of #rstats code, ## within functions, and ### at the top level of scripts. ESS indents accordingly
A single index can be used to select from a matrix. For example, X[row(X)==col(X)] is the same as diag(X) #rstats http://t.co/EY1uMfny
Robust function writing tip: use seq_len(N) instead of 1:N (it handles the N<1 case appropriately): http://t.co/mZdDZCJE #rstats
Train support vector machines in R with the "svm" function from the e1071 package: http://t.co/OM5duD90 #rstats
A handy alias (via @hadleywickham) for #rstats to prevent saving or loading workspaces: R --no-save --no-restore-data --quiet
Filter list elems that match a condition: id<-sapply(mylist, function(e) test(e)); mylist[id] # Replace "test" with any T/F expr #rstats
The # character introduces comments in R. Everything after the # character to end-of-line is ignored by the interpreter. #rstats
The "break" statement immediately exits from a "for" or "while" loop: http://t.co/O4xamQqt #rstats
To debug warnings, options(warn=2) converts warnings into errors #rstats
Monthly Archives: June 2009
Erlang at Facebook, SAP, …
Erlang At? Please add a comment if you use it in your company! Erlang at BBC http://www.erlang-factory.com/upload/presentations/147/EndaFarrell-ErlangFactoryLondon2009-ErlangattheBBC.pdf Erlang at Facebook Functional Programming at Facebook by Chris Piro and Eugene Letuchy. http://www.erlang-factory.com/upload/presentations/31/EugeneLetuchy-ErlangatFacebook.pdf http://www.process-one.net/en/blogs/article/facebook_chat_supports_xmpp_with_ejabberd/ Erlang at Github http://github.com/blog/112-supercharged-git-daemon Erlang at SAP http://www.erlang-factory.com/upload/presentations/57/SumeetBajaj_ErlangatSAP.pdf … Continue reading
Facebook.com Architecture
Do U want to learn something about the architecture of Facebook.Com? See this presentation
Connecting to a database with a webService (cxf) deployed (osgi) in Servicemix
1) Install and start ServiceMix 4.0 2) Add necessary bundles features/install cxf-osgi osgi/install -s mvn:org.apache.servicemix.bundles/org.apache.servicemix.bundles.commons-dbcp/1.2.2_3/ osgi/install -s wrap:mvn:org.springframework/spring-jdbc/2.5.6/ osgi/install -s wrap:mvn:mysql/mysql-connector-java/5.1.6 … See details in this gooole document or download test-wsdl-first-osgi.zip
Howto sharing (osgi style) a database connection in Servicemix4 / FuseEsb4
<?xml version=”1.0″ encoding=”UTF-8″?> <beans xmlns=”http://www.springframework.org/schema/beans” xmlns:xsi=”http://www.w3.org/2001/XMLSchema-instance” xmlns:camel-osgi=”http://activemq.apache.org/camel/schema/osgi” xmlns:osgi=”http://www.springframework.org/schema/osgi” xsi:schemaLocation=” http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd http://www.springframework.org/schema/osgi http://www.springframework.org/schema/osgi/spring-osgi.xsd http://activemq.apache.org/camel/schema/spring http://activemq.apache.org/camel/schema/spring/camel-spring.xsd http://activemq.apache.org/camel/schema/osgi http://activemq.apache.org/camel/schema/osgi/camel-osgi.xsd”> <bean id=”moodleDS”> <property name=”driverClassName” value=”com.mysql.jdbc.Driver” /> <property name=”url” value=”jdbc:mysql://localhost:3306/moodle” /> <property name=”username” value=”root” /> <property name=”password” value=”” /> </bean> <osgi:service id=”moodleDSOsgiService” ref=”moodleDS” interface=”javax.sql.DataSource” … Continue reading
ISTAT is moving from SAS to R
“Istat [..] helps to develop ‘R Project‘, a statistical open source application. “We have donated software libraries to R, and are moving away from using SAS, the proprietary alternative to R. We contributed to the statistical application Adamsoft, which is … Continue reading