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 nonlinear dimension reduction with ISOMAP:
- First, install and load the RnavGraphImageData and vegan packages:
> install.packages("RnavGraphImageData")
> install.packages("vegan")
> library(RnavGraphImageData)
> library(vegan)
- You can then load the dataset, digits:
> data(digits)
- Rotate and plot the image:
> sample.digit = matrix(digits[,3000],ncol = 16, byrow=FALSE)
> image(t(sample.digit)[,nrow(sample.digit):1])
A sample image from the digits dataset
- Next, you can randomly sample 300 digits from the population:
> set.seed(2) > digit.idx = sample(1:ncol(digits),size = 600) ...
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