Blog Archives

In Reply to Ben Bolker’s Post "Google Scholar (still) sucks"

November 14, 2011
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In Reply to Ben Bolker’s Post "Google Scholar (still) sucks"

Replying to Ben Bolker's post Google Scholar (still) sucks:Ben,thanks for illustrating the issue in your post!The main purpose of my function GScholarScraper is to retrieve titles - just because this is the best we can get from Google Scholar. Abstract...

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An Image Crossfader Function

November 10, 2011
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An Image Crossfader Function

Some project offspin, the jpgfader-function (the jpgfader-function in funny use can be viewed HERE):Read more »

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Add Transparency to JPEG – Yes, We Can!

November 9, 2011
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Add Transparency to JPEG – Yes, We Can!

...Just read you JPEG and add an alpha channel manually, then assign values for transparency. Of course for printing you need to use a device that accepts alpha.See how it's done HERE.

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R-Function GScholarScraper to Webscrape Google Scholar Search Result

November 9, 2011
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R-Function GScholarScraper to Webscrape Google Scholar Search Result

Based on my previous post on Web Scraping I coded and uploaded the Function "GScholarScraper" HERE for testing!The function will pull all (!) results, processing pages in chunks of 100 results/titles, and return a file with all titles, links, etc. It w...

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Next Level Web Scraping

November 5, 2011
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Next Level Web Scraping

The outcome presented above will not be very useful to most of you - still, this could be a good example for what possibly can be done via web scraping in R.Background: TIRIS is the federal geo-statistical service of North-Tyrol, Austria. One of many g...

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Some Simple but Propably Useful Regex Examples with R-Package stringr…

November 3, 2011
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Some Simple but Propably Useful Regex Examples with R-Package stringr…

I found that examples for the use of regex in R are rather rare. Thus, I will provide some examples from my own learning materials - mostly stolen from the help pages, with small but maybe illustrative adaptions.ps: I will extent this list of examples...

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Web Scraping Google Scholar & Show Result as Word Cloud Using R

November 1, 2011
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Web Scraping Google Scholar & Show Result as Word Cloud Using R

OUTDATED! Please see the update HERE!...When reading Scott Chemberlain's last post about web-scraping I felt it was time to pick up and complete an idea that I was brooding over for some time now:When a scientist aims out for a new project the firs...

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Using IUCN-Data, ArcMap 9.3 and R to Map Species Diversity

October 31, 2011
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Using IUCN-Data, ArcMap 9.3 and R to Map Species Diversity

..I'm overwhelmed by the ever-growing loads of data that's made available via the web. I.e., IUCN collects and hosts spatial species data which is free for download. I'm itching to play with all this data... And, in the end there may arise ...

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A Simple Example for the Use of Shapefiles in R

October 24, 2011
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A Simple Example for the Use of Shapefiles in R

A simple example for drawing an occurrence-map (polygons with species' points) with the R-packages maptools and sp using shapefiles.HERE is the example data.Read more »

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A Little Webscraping-Exercise…

October 22, 2011
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A Little Webscraping-Exercise…

In R it's quite easy to pull out anything from a webpage and I'll show a little exercise in doing so.Here I retrieve all blog addresses from R-bloggers by the function readLines() and some subsequent data processing.Read more »

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