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“simply start over and build something better”

September 12, 2010
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“simply start over and build something better”

The post on the shortcomings of R has attracted a huge number of readers and Ross Ihaka has now posted a detailed comment that is fairly pessimistic… Given the directions drafted in this comment from the father of R (along with Robert Gentleman), I once again re-post this comment as a main entry to advertise

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Preventing argument use in R

September 12, 2010
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Preventing argument use in R

It sounds silly, but sometimes you don't want to let people use some arguments of a function. The canonical example is write.csv. The function is effectively a wrapper to write.table, but using "," as the separator and "." as the decimal.

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Raster “Cover” function

September 11, 2010
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Raster “Cover” function

The last bits of raster are coming together and everything is working so we are getting really close here. Today i will cover the raster function ‘cover’ which robert has just updated to handle a brick function. Lets review the situation with a toy example: First, we read in the Land data into a Brick.

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10w2170, Banff

September 11, 2010
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10w2170, Banff

Yesterday night, we started the  Hierarchical Bayesian Methods in Ecology workshop by trading stories. Everyone involved in the programme discussed his/her favourite dataset and corresponding expectations from the course. I found the exchange most interesting, like the one we had two years ago in Gran Paradiso, because of the diversity of approaches to Statistics reflected

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R SQL-ish aggregation

September 10, 2010
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R SQL-ish aggregation

I came to R from SQL. I’ve heard that packages such as reshape and plyr are quite beautiful, but to me they are somewhat non-intuitive. I’m always looking for SELECT mean(sodium) as mean, variance(sodium) as var FROM texas GROUP BY … Continue reading →

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Off to Banff!!

September 9, 2010
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Off to Banff!!

Today I am travelling from Paris to Banff, via Amsterdam and Calgary, to take part in the Hierarchical Bayesian Methods in Ecology two day workshop organised at BIRS by Devin Goodsman (University of Alberta),  François Teste (University of Alberta), and myself. I am very excited both by the opportunity to meet young researchers in ecology

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Typo in Chapter 5

September 9, 2010
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Typo in Chapter 5

Gilles Guillot from Technical University of Denmark taught a course based on our R book and he pointed out to me several typos in Chapter 5 of “Introducing Monte Carlo Methods with R”: p.137 second equation from bottom should be p. 138  Example 5.7 denominator in the gradient should be

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Julien on R shortcomings

September 8, 2010
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Julien on R shortcomings

Julien Cornebise posted a rather detailed set of comments (from Jasper!) that I thought was interesting and thought-provoking enough (!) to promote to a guest post. Here it is , then, to keep the debate rolling (with my only censoring being the removal of smileys!). (Please keep in mind that I do not endorse everything

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CCE

September 7, 2010
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CCE

Wasnt that hard. green is land, blue is sea. new data awaits you. old data taken down For Zeke: Green is landcoast cells, blue is seacoast.  The cells are AREA weighted per cce request but not Fractiionally weighted. That is if a cell is 90% land and 10% water, this weighting is NOT applied. I

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Truly random?!

September 6, 2010
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Truly random?!

Having purchased the September edition of La Recherche because of its (disappointing!) coverage on black matter, I came by a short coverage on an Intel circuit producing “truly random” numbers… I already discussed this issue in an earlier post, namely that there is no reason physical generators are “more” random than congruential pseudo-random generators, but

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