Russell Dinnage rdinnager

Wolfram Alpha API from R

The attached code file provides an easy basic interface to the Wolfram Alpha API. Inspired by the wolframalpha module available for Python.

source("wa_lib.R")

Initialize client

Is there an easy way to convert a named list into a dataframe, preserving the elements of the list in a "list-column"?

library(dplyr)
library(magrittr)

## make a random matrix
rand_mat <- function() {
  Nrow <- sample(2:15,1)

Ncol <- sample(2:15,1)

Is there an easy way to convert a named list into a dataframe, preserving the elements of the list in a "list-column"?

    library(dplyr)
    library(magrittr)

    ## make a random matrix
    rand_mat <- function() {

Apparently, there is a simple problem called Fizz buzz which is sometimes used to identify competent programmers. A good opportunity to practice some dplyr and magrittr tricks.

library(dplyr)
library(magrittr)
library(knitr)

1:100 %>%
 data.frame %&gt;%

Simple data manipulations in R

Many years ago, I was introduced to R by Cam Webb . At the time, his website contained a list of common data manipulations (original here). This list dated from Cam's early experience with R, and contained the R-help mailing list responses to a series of data manipulations. For a long time, I kept this file as a handy reference. I printed it out. I recommended it to friends.

Now I have been using R for years, and the state of the art has advanced considerably. Particulary, Hadley Wickham's reshape2 and dplyr packages have transformed the way most useRs manipulate their data. I decided that it would be interesting to revisit my favourite resource and try my hand at solving these problems with tools from these two packages.

library(reshape2)
library(dplyr)

The rBlocks Experiement

Having fun with Ramnath Vaidyanathan's new package rblocks!

	# Requirements
	#sudo apt-get install libcurl4-gnutls-dev # for RCurl on linux
	#install.packages('RCurl')
	#install.packages('RJSONIO')

	library('RCurl')
	library('RJSONIO')

	query <- function(querystring) {
	h = basicTextGatherer()

Russell Dinnage rdinnager

Wolfram Alpha API from R

Initialize client

Simple data manipulations in R

The rBlocks Experiement

Iris & AirPassengers