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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
Tag Archives: LinkedIn
Calling soap web services with curl from a unix shell
How to call soap web services from a unix shell? it is easy with curl and, optionally, xsltproc ! Read the tutorial soap requests with curl !
Ebot: an erlang web crawler
Ebot is a opensource and scalable web crawler written on top of Erlang, a NOSQL database (Apache CouchDB or Riak), RabbitMQ, Mochiweb, Webmachine, .. See my Erlang info page for more details.
RabbitMQ acquired by SpringSource/VMWare
“Erlang-based RabbitMQ was acquired today by SpringSource, which is owned by VMWare” “RabbitMQ is a complete and highly reliable enterprise messaging system based on the emerging AMQP standard. It is licensed under the open source Mozilla Public License and has … Continue reading
The Interactive Internet is quite near… the new facebook chat with XMPP…
After Google with GTalk (~ 180 million users) , now also Facebook (> 400 million users ) has switched its chat protocol to Jabber/XMPP ( pdf introduction). Now you need simply a generic xmpp client (like Adium, iChat, Miranda, Pidgin) … Continue reading