890 search results for "how to import image file to r"

Exporting ctree object to Asymptote

August 25, 2012
By
Exporting ctree object to Asymptote

When producing regression or classification trees (standard rpart or ctree from party package) in GNU R I am often unsatisfied with the default plots they produce. One of many possible solutions is to export a tree plot to Asymptote.The ...

Read more »

Minimum Expected Shortfall, Part 2

August 14, 2012
By
Minimum Expected Shortfall, Part 2

Previously, we setup the problem of constructing a minimum expected shortfall portfolio.   We exported the portfolio weights from each quarterly rebalancing into R objects. This post will process those weights and compare the portfolio s...

Read more »

Quick SAP HANA and R usecase

Quick SAP HANA and R usecase

DISCLAIMER: I'm not an SAP HANA expert or an R expert, not even a Python expert. I'm just a guy with a lot of ideas who loves to write blogs.The other day I was thinking about making some nice with SAP HANA and R, because people doesn't seem to be enou...

Read more »

Simulation: The modeller’s laboratory

August 10, 2012
By
Simulation: The modeller’s laboratory

In his 2004 paper in Trends in Ecology and Evolution, Steven Peck argues: Simulation models can be used to mimic complex systems, but unlike nature, can be manipulated in ways that would be impossible, too costly or unethical to do in natural systems. Simulation can add to theory development and testing, can offer hypotheses about the

Read more »

Exploring distributions of Ensatina salamander subspecies using rvertnet by Neil Kelly

August 9, 2012
By
Exploring distributions of Ensatina salamander subspecies using rvertnet by Neil Kelly

This week we have a guest blog post by Neil Kelley Last week, I stumbled on Vijay’s blog post demonstrating his new package rvertnet. Although I am a paleontologist, some of my research involves anatomical comparison between extinct species and extant relatives or ecological analogs, so I have some experience using VertNet to track down

Read more »

Exploring distributions of Ensatina salamander subspecies using rvertnet by Neil Kelly

August 9, 2012
By
Exploring distributions of Ensatina salamander subspecies using rvertnet by Neil Kelly

This week we have a guest blog post by Neil Kelley Last week, I stumbled on Vijay’s blog post demonstrating his new package rvertnet. Although I am a paleontologist, some of my research involves anatomical comparison between extinct species and extant relatives or ecological analogs, so I have some experience using VertNet to track down

Read more »

The top 10 critical packages on CRAN

August 8, 2012
By
The top 10 critical packages on CRAN

While most R packages on CRAN are designed to be used by an R user directly, a few packages are designed to be used by other package developers. (And some packages are so useful that they're regularly used by both camps.) When a package author publishes a package to CRAN, she must list those packages that provide functions her...

Read more »

The New 60/40

August 6, 2012
By
The New 60/40

I want to share a brilliant idea and a great example from the You’re Looking at the Wrong Number post at the GestaltU blog. Today, I will focus on the section of this post that outlines simple steps to improve a typical 60/40 stock/bond portfolio by using risk allocation instead of dollar allocation, and targeting

Read more »

Getting started with Sweave & knitr

August 6, 2012
By
Getting started with Sweave & knitr

Cool woven artwork on the campus of Kansas University. The image is CC by Patrick Emerson I recently started to work with Sweave (by Friedrich Leisch)...

Read more »

Getting Started Using R, Part 1: RStudio

August 4, 2012
By
Getting Started Using R, Part 1:  RStudio

Despite my preference for SAS over R, there are some add-ons to “basic” R that I’ve found that have made my learning process way easier.  While I’m still in my infancy in learning R, I feel like once I found … Continue reading →Getting Started Using R, Part 1: RStudio is an article from randyzwitch.com,...

Read more »