October 2017
Beginner to intermediate
572 pages
26h 1m
English
book
Machine Learning with R Cookbook - Second Edition
by AshishSingh Bhatia, Yu-Wei, Chiu (David Chiu)
Content preview from Machine Learning with R Cookbook - Second Edition
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How to do it...
Perform the following steps to cluster digits with different clustering techniques:
- First, you need to install and load the png package:
> install.packages("png")
> library(png)
- Then, please read images from handwriting.png and transform the read data into a scatter plot:
> img2 = readPNG("handwriting.png", TRUE)
> img3 = img2[,nrow(img2):1]
> b = cbind(as.integer(which(img3 < -1) %% 28), which(img3 < -1) / 28)
> plot(b, xlim=c(1,28), ylim=c(1,28))
A scatter plot of handwriting digits
- Perform a k-means clustering method on the handwriting digits:
> set.seed(18) > fit = kmeans(b, 2) > plot(b, col=fit$cluster) > plot(b, ...
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