R: Bar chart from CSV

This page looks at using CSV data.

An R program is provided to use that CSV data to create a bar chart.

Here are links to the topic series of representing and processing data.

R examples:

Python examples:

JavaScript and D3 examples:

JavaScript: SVG bar chart using D3

Julia examples:

Julia: Bar chart from JSON data using StatsPlots

... more to be added ... Here is the CSV data to be read.

a,59900 b,11302 c,14311 d,34483 e,95247 f,17852 g,13528 h,62509 i,46347 j,2321 k,4449 l,25939 m,19154 n,51311 o,54741 p,9918 q,183 r,37468 s,44630 t,72396 u,20651 v,7458 w,18376 x,376 y,14814 z,234

Here is the R code [#1]

csvFs1 <- "./letters1.csv"
dataFrame1 <- read.csv(
	csvFs1,
	header=FALSE,
	sep=",",
	as.is=1,
	strip.white=TRUE
	)
colnames(dataFrame1) <- c("Letter","Count")
dataFrame1$Count <- as.integer(dataFrame1$Count)
cat("\n")
cat("Data frame via CSV with comma separator:\n")
print(dataFrame1)
imageFs2 <- "./rx.rx-13-01.png"
png(
	imageFs2,
	width=640,
	height=240
	)
labels1 = dataFrame1$Letter
barplot(
	dataFrame1$Count,
	main="Count by Letter",
	xlab="Letter",
	ylab="Count",
	names=labels1,
	cex.lab=1.5,
	cex.axis=1.2,
	cex.main=2.0,
	cex=0.9
	)
invisible(dev.off())

The as.integer function is used to convert the Count field in dataFrame1 from character (as read from the data) to integer.

... more to be added ...

Here is the output of the R code.

Data frame via CSV with comma separator:
   Letter Count
1       a 59900
2       b 11302
3       c 14311
4       d 34483
5       e 95247
6       f 17852
7       g 13528
8       h 62509
9       i 46347
10      j  2321
11      k  4449
12      l 25939
13      m 19154
14      n 51311
15      o 54741
16      p  9918
17      q   183
18      r 37468
19      s 44630
20      t 72396
21      u 20651
22      v  7458
23      w 18376
24      x   376
25      y 14814
26      z   234

This is a simple bar chart for the present purposes. Future topics will cover how to make it look nicer.

Here is the chart produced by the R code. Count by Letter