1294 search results for "how to import image file to R"

The R-Files: Saptarshi Guha

October 11, 2010
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The R-Files: Saptarshi Guha

"The R-Files" is an occasional series from Revolution Analytics, where we profile prominent members of the R Community. Name: Saptarshi Guha Background: Ph.D. in Statistics, Purdue University Nationality: India Years Using R: 6 Known for: Developing RHIPE package for R + Hadoop integration At just 31 years old, Saptarshi Guha has emerged as a cutting-edge contributor to the R...

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Getting going – importing data and plotting a simple graphic

July 20, 2010
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Getting going – importing data and plotting a simple graphic

The most difficult part of the learning curve in R is often getting going – many datasets are pre-installed in the packages and organised, so it is difficult to see how you to import your own data into R.  This post takes you step by step through the process of making a table from a

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Speed-reading files, revisited

December 29, 2009
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Speed-reading files, revisited

In a post earlier this month, it seemed as though compressing a data file before reading it into R could save you some time. With some feedback from readers and further experimentation, we might need to revisit that conclusion To recap, in our previous experiment it took 170 seconds to read a 182Mb text file into R. But if...

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Image Compression with the SVD in R

December 17, 2009
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Image Compression with the SVD in R

Over the next few posts, I’m going to be reviewing the use of R to implement the most commonly used matrix techniques for image manipulation. The code will be surprisingly simple to understand, because the real magic behind these techniques lies in the mathematics that R provides an abstract interface to. To start, I’m going

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Export Data Frames To Multi-worksheet Excel File

October 6, 2009
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Export Data Frames To Multi-worksheet Excel File

A few weeks ago I needed to export a number of data frames to separate worksheets in an Excel file. Although one could output csv-files from R and then import them manually or with the help of VBA into Excel, I was after a more streamlined solution, as I would need to repeat this process

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How to Import MS Excel Data into R

September 26, 2009
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How to Import MS Excel Data into R

s Sir Francis Bacon said, “Histories make men wise; poets witty; the mathematics subtile; natural philosophy deep; moral grave; logic and rhetoric able to contend.” And Windows stupid. He should have added the last sentence if he were a Windows user in this age. 1. Avoid Using M$ Excel A lot of R users often ask this question:

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R 3.3.0 is released!

May 3, 2016
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R 3.3.0 is released!

R 3.3.0 (codename “Supposedly Educational”) was released today. You can get the latest binaries version from here. (or the .tar.gz source code from here). The full list of new features and bug fixes is provided below. Upgrading to R 3.3.0 on Windows If you are using Windows you can easily upgrade to the latest version of R using the installr package. … Continue reading...

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Cross-Validation for Predictive Analytics Using R

May 3, 2016
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Cross-Validation for Predictive Analytics Using R

Cross-validation is a widely used model selection method. We show how to implement it in R using both raw code and the functions in the caret package. The post Cross-Validation for Predictive Analytics Using R appeared first on MilanoR.

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Learning R for Data Visualization [Video]

April 25, 2016
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Learning R for Data Visualization [Video]

Last year Packt asked me to develop a video course to teach various techniques of data visualization in R. Since I love the idea of video courses and tutorials, and I also enjoy plotting data, I readily agreed.The result is this course, published last ...

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Fast csv writing for R

April 25, 2016
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Fast csv writing for R

Guest post by Matt Dowle. This post was first published on the H2O blog, please go there to leave a comment. R has traditionally been very slow at reading and writing csv files of, say, 1 million rows or more. Getting data into R is often the first task a user needs to do and if they have a poor...

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