make.xyz {mapplots}

Create xyz object

Description

Creata an xyz object for use with the functions draw.barplot2D and draw.pie

Usage

make.xyz(x, y, z, group, FUN = sum, ...)

Arguments

x, y

vector with x and y-locations of the 2D barplots or pies to be plotted.

z

vector (same length as x) with the values to be displayed as the areas of the pie slices or 2D barplot.

group

factor (same length as x) with groupings for the x, y, z data, e.g. year, species etc.

FUN

function to apply to the z(in case there are duplicate combinations of x, y and group).

...

optional arguments to FUN.

Author(s)

Hans Gerritsen

See Also

draw.barplot2D and draw.pie

Examples

data(landings)
data(coast)
xlim <- c(-12,-5)
ylim <- c(50,56)
xyz <- make.xyz(landings$Lon,landings$Lat,landings$LiveWeight,landings$Species)
col <- rainbow(5)
basemap(xlim, ylim, main = "Species composition of gadoid landings")
draw.shape(coast, col="cornsilk")
draw.pie(xyz$x, xyz$y, xyz$z, radius = 0.3, col=col)
legend.pie(-13.25,54.8,labels=c("cod","had","hke","pok","whg"), radius=0.3, bty="n",
 col=col, cex=0.8, label.dist=1.3)
legend.z <- round(max(rowSums(xyz$z,na.rm=TRUE))/10^6,0)
legend.bubble(-13.25,55.5,z=legend.z,round=1,maxradius=0.3,bty="n",txt.cex=0.6)
text(-13.25,56,"landings (kt)",cex=0.8)