Monthly Archives: September 2011

Forbush events

September 12, 2011
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Forbush events

As noted here there is a new paper linking Forbush events with changes in DTR. Simply, during a Forbush event  cosmic rays are modulated ( the flux reaching the earth decreases. The theory goes something like this. If GCRs play a role in cloud formation, then when they decrease you should be able to detect an

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RQuantLib 0.3.8

September 12, 2011
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A bug-fix release RQuantLib 0.3.8 is now on CRAN and in Debian. RQuantLib combines (some of) the quantitative analytics of QuantLib with the R statistical computing environment and language. Thanks to Helmut Heiming who noticed a side-effec t f...

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R to Word, revisited

September 12, 2011
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In a previous post (a long time ago) I discussed a way to get a R data frame into a Word table. The code in that entry was essentially a brute force way of wrapping R data in RTF code, but that RTF code was the bare minimum. There was no optimization of widths, or borders, or...

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Converting values to color levels

September 12, 2011
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Converting values to color levels

     Adding color to a plot is helpful in many situations for visualizing an additional dimension of the data. Again, I wrote the below function "val2col" in R after having coded this manually over and over in the past. It uses similar arguments as the image function in that one defines the...

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Solve your R problems

September 12, 2011
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Solve your R problems

  download ‘The R Inferno’ Epilogue I’m not a lawyer, but here is my understanding of the rules should you want to extract images from this page: Most of the images are from istockphoto.com. You would need to pay for each image that you want to use. It is unlikely that Sandro Botticelli is going … Continue reading...

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Call by reference in R

September 11, 2011
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Call by reference in R

Sometimes it is convenient to use “call by reference evaluation” inside an R function. For example, if you want to have multiple return value for your function, then either you return a list of return value and split them afterward or you can return the value via the argument. For some reasons(I would like to

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LondonR, 7 September 2011

September 11, 2011
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LondonR, 7 September 2011

On 7 September 2011 I attended the London R user group meeting. It was a very good turn out with about 50 attendees at the Shooting Star, a pub close to Liverpool Street Station. The session started at 18:00 with four presentations, followed by drinks ...

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Including googleVis output into a blogger post

September 11, 2011
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Including googleVis output into a blogger post

It seems that you cannot include Google Visualisation Charts into a blog post directly.So, I tried to include the output of a googleVis function as a gadget, but also unsuccessful.Although you can include gadgets into your site template, it doesn't see...

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R subplot() with multiple lines

September 11, 2011
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I have recently used the subplot() function of the TeachingDemos library for R: I wanted to create a simple embedded chart with multiple lines on it. The trick was to create a simple function that prepares the whole plot and pass it to the subplot() function to execute as shown below: > x > x() > plot(1:10)...

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Alternately coloured line environment with fancyvrb

September 11, 2011
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Recently, while typing up an R tutorial, I used the LaTeX fancyvrb package to create two environments—one coloured blue for R commands, and one coloured red to display R output. This worked well for large blocks of each type. Then I decided I wan...

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