The Batman’s Ecosystem

November 3, 2015
By

(This article was first published on Ripples, and kindly contributed to R-bloggers)

If I weren’t crazy, I’d be insane! (Joker)

I present today a dynamical D3.js plot where I combine three things:

  • The Batman curve
  • A text mining analysis to obtain most common words from the Batman’s page at Wikipedia
  • A line plot using morris.js library of rCharts package where point labels are the words obtained in the previous step

This is my particular homage to one of the most amazing superheros ever, together with Daredevil. Since I am not allowed to post JavaScript nor embed objects in my WordPress.com blog, I can only show you an screenshot of the graph:

batman2
If you want to play with the graph, you can download it here. This is not the first time I write about Batman (see this), and maybe will not be the last one.

The code:

require(ggplot2)
require(dplyr)
require(rCharts)
library(rvest)
library(tm)
f1u <- function(x) {ifelse ((abs(x) >  3 & abs(x) <= 7), 3*sqrt(1-(x/7)^2), 0)}
f1d <- function(x) {ifelse ((abs(x) >= 4 & abs(x) <= 7), -3*sqrt(1-(x/7)^2), 0)}
f2u <- function(x) {ifelse ((abs(x) > 0.50 & abs(x) < 0.75),  3*abs(x)+0.75, 0)}
f2d <- function(x) {ifelse ((abs(x) > -4 & abs(x) < 4), abs(x/2)-(3*sqrt(33)-7)*x^2/112-3 + sqrt(1-(abs(abs(x)-2)-1)^2), 0)}
f3u <- function(x) {ifelse ((x > -0.5 & x < 0.5), 2.25, 0)}
f4u <- function(x) {ifelse ((abs(x) >  1 & abs(x) <= 3), 6 * sqrt(10)/7 + (1.5 - 0.5 * abs(x)) * sqrt(abs(abs(x)-1)/(abs(x)-1)) - 6 * sqrt(10) * sqrt(4-(abs(x)-1)^2)/14, 0)}
f5u <- function(x) {ifelse ((abs(x) >= 0.75 & abs(x) <= 1), 9-8*abs(x), 0)}
fu <- function (x) f1u(x)+f2u(x)+f3u(x)+f4u(x)+f5u(x)
fd <- function (x) f1d(x)+f2d(x)
batman <- function(r,x) {ifelse(r%%2==0, fu(x), fd(x))}
data.frame(x=seq(from=-7, to=7, by=0.125)) %>%
  mutate(y=batman(row_number(), x)) -> df
html("https://en.wikipedia.org/wiki/Batman") %>%
  html_nodes("#bodyContent")  %>%
  html_text() %>%
  VectorSource() %>%
  Corpus() %>%
  tm_map(tolower) %>%
  tm_map(removePunctuation) %>%
  tm_map(removeNumbers) %>%  
  tm_map(stripWhitespace) %>%
  tm_map(removeWords, c(stopwords(kind = "en"), "batman", "batmans")) %>%
  DocumentTermMatrix() %>%
  as.matrix() %>%
  colSums() %>%
  sort(decreasing=TRUE) %>%
  head(n=nrow(df)) %>%
  attr("names") -> df$word
m1=mPlot(x = "x",  y = "y",  data = df,  type = "Line")
m1$set(pointSize = 5,
       lineColors = c('black', 'black'),
       width = 900,
       height = 500,
       hoverCallback = "#! function(index, options, content)
                  { var row = options.data[index]
                  return '' + row.word + ''} !#",
       lineWidth = 2,
       grid=FALSE,
       axes=FALSE)
m1
m1$save('Batman.html', standalone = TRUE)

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