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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
Author Archives: matteo
Happy new year 2012 with R
http://yihui.name/en/2011/01/happy-new-year-with-r-2011-fireworks/
The 10 Most Important Open Source Projects of 2011
Hadoop Git Cassandra LibreOffice OpenStack Jquery Nginx Node.js Puppet See original post at linux.com
SAP OpenSource NOSQL MongoDB
MongoDB Selected as the Core Content Management Component of SAP’s Platform-as-a-Service (PaaS) Offering “MongoDB’s Flexibility and Scalability Will Enable SAP to Scale Its Content Management Service on Its PaaS to Meet Customer Demand While Managing Data From Different Applications” Read … Continue reading
Oracle Opensource NoSQL Hadoop R
Oracle’s comprehensive big data strategy includes NoSQL, Hadoop, and R analytics “Oracle’s planned distribution of the open-source R statistical environment will be adapted for use on large-scale data within the Oracle database, rather than on desktops and laptops where analysts … Continue reading
Are you a good programmer?
I have just read a funny article about the kind of good programmers at techiferous.com: the philosopher, the inventor, the conqueror, the problem solver..
Twitter data mining with R: generating wordclouds
This image is a sample Word cloud about tweets related to the word linux. It was generated with R (see source code twitter-r-utils) following the examples from: text data ming with Twitter and R wordcloud in R
Vertiginoso Google+ già 10 milioni di utenti
Google+, il nuovo social network, lanciato a fine giugno, starebbe crescendo in maniera esponenziale ed entro una settimana potrebbe contare su 20 milioni di persone registrate. La stima è stata ottenuta grazie alla ricorrenza dei cognomi…
Aboliamo le province, più potere alle regioni!
Riduciamo i costi della politica italiana abolendo le province e dando alle regioni le competenze che oggi spettano alle province! Di cosa si occupano le province oltre che manutenere le strade provinciali?
Moodle 2.1 released!
“Moodle is a software package for producing Internet-based courses and web sites. It is a global development project designed to support a social constructionist framework of education. Moodle is provided freely as Open Source software (under the GNU Public License).” … Continue reading