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 perform multidimensional scaling using the metric method:
- First, you can perform metric MDS with a maximum of two dimensions:
> swiss.dist =dist(swiss)
> swiss.mds = cmdscale(swiss.dist, k=2)
- You can then plot the swiss data in a two-dimension scatter plot:
> plot(swiss.mds[,1], swiss.mds[,2], type = "n", main = "cmdscale (stats)")
> text(swiss.mds[,1], swiss.mds[,2], rownames(swiss), cex = 0.9, xpd = TRUE)
The two-dimension scatter plot from cmdscale object
- In addition, you can perform nonmetric MDS with isoMDS:
> library(MASS) > swiss.nmmds = isoMDS(swiss.dist, k=2) initial value 2.979731 ...
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