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Last data update: 2014.03.03

R: Calculate polar coordinates of elements in a matrix

polarXY

R Documentation

Calculate polar coordinates of elements in a matrix

Description

Computes the radius and and angle of each element's location in a matrix with respect to the centroid.

Usage

polarXY(I, centroid)

Arguments

`I`	`"Matrix"` representation of an image, or any matrix.
`centroid`	two numbers, the x coordinate of the centroid and the y coordinate of the centroid. The function `calcCentroid` may be used to estimate the image centroid.

Value

"list"

`radius`	The radius of the polar coordinates of each element in the input matrix.
`theta`	The angle of the polar coordinates of each element in the input matrix.

Author(s)

Allison Irvine, Tan Dang

Examples

data(lena);
I=rowSums(img,dims=2);
center= calcCentroid(I);
result= polarXY(I, center);

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.

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'citation()' on how to cite R or R packages in publications.

Type 'demo()' for some demos, 'help()' for on-line help, or
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> library(IM)
Loading required package: png
Loading required package: jpeg
Loading required package: bmp
> png(filename="/home/ddbj/snapshot/RGM3/R_CC/result/IM/polarXY.Rd_%03d_medium.png", width=480, height=480)
> ### Name: polarXY
> ### Title: Calculate polar coordinates of elements in a matrix
> ### Aliases: polarXY polarXY-methods polarXY,matrix,numeric-method
> ### Keywords: utilities
> 
> ### ** Examples
> 
> data(lena);
> I=rowSums(img,dims=2);
> center= calcCentroid(I);
> result= polarXY(I, center);
> 
> 
> 
> 
> 
> dev.off()
null device 
          1 
>