882 search results for "how to import image file to R"

robot (SPX) DNA Management Techniques

May 18, 2010
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robot (SPX) DNA Management Techniques

Yes, this is related to trading, but no, it is not my thesis on why the Euro is going to parity. Instead, it is sort of a workshop for robot(SPX) developers on how to organize their digital DNA. As you begin to use programming as a money extraction tool on the markets, you'll soon find...

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Computational Statistics

May 9, 2010
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Computational Statistics

Do not resort to Monte Carlo methods unnecessarily. When I received this 2009 Springer-Verlag book, Computational Statistics, by James Gentle a while ago, I briefly took a look at the table of contents and decided to have a better look later… Now that I have gone through the whole book, I can write a short

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hash-2.0.0

April 30, 2010
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hash-2.0.0

Come see my talk on hashes in R at useR! 2010. (http://user2010.org/) July 20-23 National Institute of Standards and Technology (NIST), Gaithersburg, Maryland, USA

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R : NA vs. NULL

April 25, 2010
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R : NA vs. NULL

The R language has two closely related NULL-like values, NA and NULL ... Both are used to represent missing or undefined values. This has lead to much confusion.

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Some LaTeX Gems – Part 1: TikZ, Loops and more

April 23, 2010
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Some LaTeX Gems – Part 1: TikZ, Loops and more

This logo means that the blog post is about something I have found interesting, but does not apply directly to the exact purpose of this blog. Note: These commands have been tested in pdflatex. I am not sure if they work in other distributions. Over the past couple of months, I have been assisting with editing some papers and also doing...

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R 2.11.0 released

April 22, 2010
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The latest version of R from the R Project, R 2.11.0, is now available in source code form. Binaries for Windows, Mac and Linux will appear in your local CRAN mirror in the next few days. Some new features include: Support for rendering bitmap images in graphics devices, via a new function rasterImage() The new function vapply is like...

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Summarising data using histograms

April 11, 2010
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Summarising data using histograms

The histogram is a standard type of graphic used to summarise univariate data where the range of values in the data set is divided into regions and a bar (usually vertical) is plotted in each of these regions with height proportional to the frequency of observations in that region. In some cases the proportion of

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abbreviating personality measures in R: a tutorial

March 31, 2010
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abbreviating personality measures in R: a tutorial

A while back I blogged about a paper I wrote that uses genetic algorithms to abbreviate personality measures with minimal human intervention. In the paper, I promised to put the R code I used online, so that other people could download and use it. I put off doing that for a long time, because the

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Lessons Learned from EC2

March 24, 2010
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Lessons Learned from EC2

A week or so ago I had my first experience using someone else’s cluster on Amazon EC2. EC2 is the Amazon Elastic Compute Cloud. Users set up a virtual computing platform that runs on Amazon’s servers “in the cloud.” Amazon EC2 is not just another cluster. EC2 allows the user to create a disk image containing an operating system...

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R Tips in Stat 511

March 22, 2010
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R Tips in Stat 511

Here are some (trivial) R tips in the course Stat 511. I’ll update this post till the semester is over. Formatting R Code Reading code is pain, but the well-formatted code might alleviate the pain a little bit. The function tidy.source() in the animation package can help us format our R code automatically. By default

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