Monthly Archives: February 2009

R graphics: margins are way to large

February 22, 2009
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R graphics: margins are way to large

For me R has a very nice and powerfull capabilities for graphics (for example see this gallery). However, I dislike the default setting for margins and placement of axis numbers and labels. Since I always forget the setting of parameters I prefer I am adding this post. For example:library(package="MASS")Sigma mu tmp plot(tmp, xlab="X variable (unit)", ylab="Y variable...

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R graphics: margins are way to large

February 22, 2009
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R graphics: margins are way to large

For me R has a very nice and powerfull capabilities for graphics (for example see this gallery). However, I dislike the default setting for margins and placement of axis numbers and labels. Since I always forget the setting of parameters I prefer I am adding this post. For example: library(package="MASS")Sigma mu tmp plot(tmp, xlab="X variable (unit)", ylab="Y variable...

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Illinois long-term selection experiment for oil and protein in corn

February 22, 2009
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Illinois long-term selection experiment for oil and protein in corn

Researchers at the University of Illinois are conducting one of the longest experiments in biology - Illinois long-term selection experiment for oil and protein in corn. The experiment started in 1896 and is still active! In esence they are selecting l...

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Project Euler Problem #13

February 21, 2009
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Problem 13 on Project Euler asks us to sum 100 50-digit numbers and give the first 10 digits of the result. This is pretty easy. Note we are using R’s integer division operator %/% to discard the remainder of the large summed integer and just giv...

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Project Euler Problem #14

February 21, 2009
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Problem 14 on the Project Euler site asks us to find the longest chain under 1 million created using the Collatz mapping. This is fairly straightforward, although performance again is not great: ## Problem 14 # Collatz conjecture problem14 <-&...

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Project Euler Problem #12

February 21, 2009
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Problem 12 on the Project Euler site asks: What is the value of the first triangle number to have over five hundred divisors? A triangular number T(n) is defined as . The R code below consists of a solution, which involves the fact that the number of proper divisors of an integer n can be

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How Facebook and Google use R

February 21, 2009
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How Facebook and Google use R

How Facebook and Google use R Interesting read.  rpart comes in handy again.

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Registration for R/Finance 2009 is Open!

February 20, 2009
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Registration for R/Finance 2009 is Open!

The conference website has details on:the agenda and speakers,travel accommodations,registration, andsponsors, who made the conference possible.Hope to see you there!

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People who love scatter plots & connecting dots

February 20, 2009
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People who love scatter plots & connecting dots

We hosted the first Dataviz Salon SF on Tuesday night, with lightning talks by boredom cop Shane Booth, dataviz wiz Lee Byron , computational journalist Brad Stenger, data wrangler Pete Skomoroch , and any/all data enthusiast Brendan O’Connor . I was going to blog all about it — but Tom Carden of Stamen Design already

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How Google and Facebook are using R

February 19, 2009
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How Google and Facebook are using R

(March 26th Update: Video now available) Last night, I moderated our Bay Area R Users Group kick-off event with a panel discussion entitled “The R and Science of Predictive Analytics”, co-located with the Predictive Analytics World conference here in SF. The panel comprised of four recognized R users from industry: Bo Cowgill, Google Itamar Rosenn,

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