R Graphical Manual

Browse All

Last data update: 2014.03.03

R: Plot vectors inside a unit circle (PCA loadings or...

vectorplot

R Documentation

Plot vectors inside a unit circle (PCA loadings or correlations plots)

Description

Plots vectors with 0<norms<1 inside a circle. These plots are mainly designed to represent variables in principal components space for PCAs.

Usage

vectorplot(x, ...)
## Default S3 method:
vectorplot(x, y, col = par("col"), circle.col = "gray",
    ar.length = 0.1, pos = NULL, cex = par("cex"), labels = NULL, ...)
## S3 method for class 'loadings'
vectorplot(x, choices = 1L:2L, col = par("col"),
    circle.col = "gray", ar.length = 0.1, pos = NULL, cex = par("cex"),
    labels = rownames(x), main = deparse(substitute(x)), ...)
## S3 method for class 'correlation'
vectorplot(x, choices = 1L:2L, col = par("col"),
    circle.col = "gray", ar.length = 0.1, pos = NULL, cex = par("cex"),
    labels = rownames(x), main = deparse(substitute(x)), ...)

Arguments

`x`	an object that has a `vectorplot()` method, like 'loadings' or 'correlation', or a numeric vector with 0<values<1.
`y`	a numeric vector with 0<values<1 of same length as `x`.
`choices`	a vector of two integers indicating the axes to plot.
`col`	color of the arrows and labels.
`circle.col`	the color for the circle around the vector plot.
`ar.length`	the length of the arrows.
`pos`	the position of text relative to arrows. If `NULL`, a suitable position is calculated according to the direction where the arrows are pointing.
`cex`	the factor of expansion for labels in the graph.
`labels`	the labels to write.
`main`	the title of the graph.
`...`	further arguments passed to plot functions.

Value

The object 'x' is returned invisibly. These functions are called for their side-effect of drawing a vector plot.

Author(s)

Philippe Grosjean <phgrosjean@sciviews.org>.

Examples

## Create a PCA and plot loadings and correlations
iris.pca <- pcomp(iris[, -5])
vectorplot(loadings(iris.pca))
vectorplot(correlation(iris.pca))
## Note: on screen devices, change aspect ratio of the graph by resizing
## the window to reveal cropped labels...

Results


R version 3.3.1 (2016-06-21) -- "Bug in Your Hair"
Copyright (C) 2016 The R Foundation for Statistical Computing
Platform: x86_64-pc-linux-gnu (64-bit)

R is free software and comes with ABSOLUTELY NO WARRANTY.
You are welcome to redistribute it under certain conditions.
Type 'license()' or 'licence()' for distribution details.

R is a collaborative project with many contributors.
Type 'contributors()' for more information and
'citation()' on how to cite R or R packages in publications.

Type 'demo()' for some demos, 'help()' for on-line help, or
'help.start()' for an HTML browser interface to help.
Type 'q()' to quit R.

> library(SciViews)
Loading required package: MASS
> png(filename="/home/ddbj/snapshot/RGM3/R_CC/result/SciViews/vectorplot.Rd_%03d_medium.png", width=480, height=480)
> ### Name: vectorplot
> ### Title: Plot vectors inside a unit circle (PCA loadings or correlations
> ###   plots)
> ### Aliases: vectorplot vectorplot.default vectorplot.loadings
> ###   vectorplot.correlation
> ### Keywords: aplot
> 
> ### ** Examples
> 
> ## Create a PCA and plot loadings and correlations
> iris.pca <- pcomp(iris[, -5])
> vectorplot(loadings(iris.pca))
> vectorplot(correlation(iris.pca))
> ## Note: on screen devices, change aspect ratio of the graph by resizing
> ## the window to reveal cropped labels...
> 
> 
> 
> 
> 
> dev.off()
null device 
          1 
>