Category archives: R

R scripting, particularly spatial analysis using R.

Basic R markdown template for writing a scientific manuscript

Last update on Sept. 6, 2017.

RStudio is a great environment for writing and R Markdown reports, manuscripts, blogs and other types of publications. It is particularly attractive for writing manuscripts that are reproducible (see for example: https://www.r-bloggers.com/composing-reproducible-manuscripts-using-r-markdown/).

However, it can be a bit daunting at first, so here's a simple template to get you started ...

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Introduction to R markdown - 1

Last update on April 27, 2017.

Tree growth analysis

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R seminar series section 2 # 3

Last update on March 30, 2017.

R seminar series section 2 #2

Last update on March 30, 2017.

In this seminar, RStudio IDE, basic syntax and Dplyr packages are discussed.

Download presentation at this Link.

R seminar series section 2 #1

Last update on March 30, 2017.

Following topics were covered in this seminar 

  • Understand R as a programming language.
  • Install R and R studio
  • Overview of R studio Panels
  • Introduction of R as an object oriented language

Download presentation at this link.

R seminar series #10

Last update on April 30, 2015.

String operations in R

Efficiently checking and/or changing strings in complex data sets is often very time consuming, but R has a rich set of functions for managing strings (e.g. sentences or paragraphs). We will focus on the stringr library in this sessions, introducing a few key functions. You will need:

library(stringr ...

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R seminar series: Seminar 9

Last update on April 8, 2015.

If you remember, Tor introduced "dplyr" package back in seminar 7. This week, Anthony Ndungu (Research Method Group) continued with "dplyr" and some examples. You can see his presentation below  

Source code for 9th seminar is shown below.


#Antony Ndungu, RMG
#R Seminar
#Using ddply
#......................................................................
setwd("/Users/Antony/Documents/Antony/RMG stuffs/RTraining_ICRAF/Data/")
 
############################################
# library ...

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R seminar series: Seminar 8

Last update on March 27, 2015.

We have conducted 8 R Brown-bag seminars till now. This week we decided to revisit some of the examples shown in previous seminars, participants were asked to write code in RStudio and show results (code writing practice session).  

See the presentation of seminar 8 below  


Data used in this seminar is available here and source ...

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R seminar series - part 7

Last update on March 19, 2015.

ggplot2 and dplyr

The seventh R brownbag seminar was by Dr. Tor G. Vagen (Senior Scientist, ICRAF) who continued from the previous week and demonstrated more advanced use of ggplot2. The dplyr package, which will be the topic of several future seminars was also introduced.


# Tor-G Vågen
# R brownbag seminar march 19th, 2015
 
# For those ...

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R seminar series - part 6

Last update on March 12, 2015.

Sixth seminar of "R brown-bag seminars" was held in ICRAF today.  Leigh Winowiecki (PhD, Soil Scientist, CIAT) presented  "Introduction to ggplot"  topic. Presentation of today's seminar is available here.

Data used in this seminar is available here and source code from seminar 6 is shown below:


#Leigh Winowiecki
#ICRAF Training March 12, 2015
#load ...

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