andrews0 {andrews}

Andrews curves

Description

Andrews curves for visualization of multidimensional data. For differences between andrews and andrews2 see the 'vignette("andrews"). For colouring the curves see the details.

Usage

andrews0(
  df,
  type = 1,
  clr = NULL,
  step = 100,
  ymax = 10,
  main = NULL,
  sub = NULL
)

Arguments

df

data frame

type

type of curve

• 1: f(t)=x_1/\sqrt{2}+x_2\sin(t)+x_3\cos(t)+x_4\sin(2t)+x_5\cos(2t)+...

• 2: f(t)=x_1\sin(t)+x_2\cos(t)+x_3\sin(2t)+x_4\cos(2t)+...

• 3: f(t)=0.5^{p/2}x_1+0.5^{(p-1)/2} x_2(\sin(t)+\cos(t))+0.5^{(p-2)/2} x_3(\sin(t)-\cos(t))+0.5^{(p-3)/2} x_4(\sin(2t)+\cos(2t))+0.5^{(p-6)/2}x_5(\sin(2t)-\cos(2t))+...) with $p$ the number of variables

• 4: f(t)=1/\sqrt{2}(x_1+x_2(\sin(t)+\cos(t))+x_3(\sin(t)-\cos(t))+x_4(\sin(2t)+\cos(2t))+x_5(\sin(2t)-\cos(2t))+...)

clr

number/name of column in the date frame for color of curves

step

smoothness of curves

ymax

maximum of y coordinate.

main

main title for the plot

sub

sub title for the plot

Details

Andrews curves transform multidimensional data into curves. This package presents four types of curves

If df[,clr] is numeric then hsv(1,1,v) with the normalized values (on ⁠\[0, 1\]⁠) of df[,clr] is used. Otherwise the number of unique values in nuv <- unique(df[,clr]) is used in connection with rainbow(nuv).

Value

nothing

Author(s)

Jaroslav Myslivec [e-mail]

References

• Andrews, D. F. (1972) Plots of High-Dimensional Data. Biometrics, vol. 28, no. 1, pp. 125-136.

• Khattree, R., Naik, D. N. (2002) Andrews Plots for Multivariate Data: Some New Suggestions and Applications. Journal of Statistical Planning and Inference, vol. 100, no. 2, pp. 411-425.

Examples

data(iris)
andrews0(iris,clr=5,ymax=3)
andrews0(iris,type=4,clr=5,ymax=2)