How long did it take to run ? system.time in r r in day #6
system.time(mydata_2MM <- read.table('~/Desktop/data/bifile.csv', sep=",", nrows=20000000))
user system elapsed
829.317 201.972 2065.421
Coruscation's r in a day #6.
May 14, 2015
May 2, 2015
Subset data some observations: which[, r in a day #5
Keep observations where brand = Sony and discard other observations.
newdata <- olddata[ which(olddata$brand=='Sony'), ]
November 30, 2014
See first 10 observations in a data set: head, r in a day #4
head prints the top ( first observations or lines) of a data set.
head(dataset_name, n=10)
X1 X2 X3
a 2 4
b 2 4
c 1 3
c 1 2
c 2 2
...
e 4 5
June 29, 2014
Adam Hogan beginning r
Adam Hogan's Beginning r. More r.
November 9, 2013
r a day #1: ls() lists datasets in the workspace
August 3, 2009
SSPS, bought by IBM for $1.2 billion
I.B.M. took a big step to expand its fast-growing stable of data analysis offerings by agreeing on Tuesday to pay $1.2 billion to buy SPSS Inc., a maker of software used in statistical analysis and predictive modeling.
Other independent analytics software makers may well become takeover targets, said Mr. Evelson of Forrester. Among the candidates, he said, are Accelrys, Applied Predictive Technologies, Genalytics, InforSense, KXEN and ThinkAnalytics.The broad consolidation wave in business intelligence software, analysts say, will bring increasing price pressure on some segments of the industry as major companies seek to increase their share of the market. And the open-source programming language for data analysis, R, is another source of price pressure on software suppliers.
"None of the consolidation purchases we've seen in the business intelligence industry have been fire sales," said Jim Davis, senior vice president of the SAS Institute, a private company based in Cary, N.C., that is the largest supplier of business intelligence and predictive analytics software.
September 27, 2007
Learn r by doing: the movie
Dan Goldstein of Decision Science News brings us
Tutorial 1 in the r statistical programming system:
* Downloading and installing R in Windows
* The R graphical user interface
* Viewing the graphics demo
* Vectors and basic stats
* Simple plotting
August 29, 2005
r graphics (Paul Murrell) is out
August 4, 2005
Information Visualisation with r
Information Visualisation Lecture Slides uses r.