mat2pol: Plot columns of a matrix as stacked areas.

In Epi: Statistical Analysis in Epidemiology

Plot columns of a matrix as stacked areas.

Description

matrix to polygon: Plot columns of a matrix as stacked areas.

Usage

mat2pol( pm,
       perm = 1:ncol(pm),
          x = as.numeric(rownames(pm)),
        col = rainbow(ncol(pm)),
         yl = 0:1,
     append = FALSE,
        ... )

Arguments

pm	Numerical matrix.
perm	integer vector of length ncol(pm), used to permute the columns of pm.
x	Numeric. The x-axis of the plot.
col	Colors of the areas.
yl	y-axis limits.
append	Logical. Should the polygons be added to an exiating plot
...	Further parameters passed to plot.

Details

The function is originally intended to plot stacked probabilities, hence the default of 0:1 for the y-axis.

Value

A matrix of ncol(pm)+1 columns with the first equal to 0, and the remaining the cumulative sum of the columns of pm[perm].

The function is called for its side effect - the stacked polygons.

Author(s)

Bendix Carstensen

Examples

M <- cbind( sort(runif(10)), sort(runif(10)), sort(runif(10)) )
pm <- sweep( M, 1, apply(M,1,sum), "/" )
mat2pol( pm )

Epi documentation built on Oct. 1, 2024, 5:07 p.m.