Functions to perform polar coordinate related functions

Description

Functions to perform polar coordinate related functions

Usage

polar2xy(rho, theta)
xy2polar(x, y)
rotate(x, y, alpha)

Arguments

Details

y and theta can be respectively missing. In this case, x and rho are expected to be lists with entries x, y, rho, theta respectively.

Examples

n <- 40
nn <- 2
thetas <- seq(0, nn * 2 * pi, length=n)

rhos <- seq(1, n) / n

plot(c(-1, 1), c(-1, 1), type="n")
abline(h=0, col="grey")
abline(v=0, col="grey")

xy <- polar2xy(rhos, thetas)

points(xy$x, xy$y, col=rainbow(n))

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(ecolitk)
> png(filename="/home/ddbj/snapshot/RGM3/R_BC/result/ecolitk/polar2xy.Rd_%03d_medium.png", width=480, height=480)
> ### Name: polar2xy
> ### Title: Functions to perform polar coordinate related functions
> ### Aliases: polar2xy xy2polar rotate
> ### Keywords: manip
> 
> ### ** Examples
> 
> 
> 
> n <- 40
> nn <- 2
> thetas <- seq(0, nn * 2 * pi, length=n)
> 
> rhos <- seq(1, n) / n
> 
> plot(c(-1, 1), c(-1, 1), type="n")
> abline(h=0, col="grey")
> abline(v=0, col="grey")
> 
> xy <- polar2xy(rhos, thetas)
> 
> points(xy$x, xy$y, col=rainbow(n))
> 
> 
> 
> 
> 
> 
> dev.off()
null device 
          1 
>