haz.ppp {ecespa}

Easily convert xy data to ppp format

Description

ppp maker for the impatient layman

Usage

haz.ppp(W)

Arguments

W

a data frame or matrix with two or three columns (coordinate x, coordinate y, and mark of the point)

Details

This naive function easily transform your xy data to the format required by spatstat (version <2.0). It establishes the window of observation as the rectangle defined by the xy range. It asumes that the first two columns are coordinates x and y, and the third (if any) gives the marks of the points.

Value

A point pattern with the format of spatstat v. < 2.0

Note

This window is an underestimate of the real sampling window of the observed points. For a less biassed estimate, use function ripras in spatstat.

Author(s)

Marcelino de la Cruz

See Also

ppp, as.ppp

Examples

data(fig1)

plot(fig1) #typical xyplot

fig1.ppp <- haz.ppp (fig1)

fig1.ppp

plot(fig1.ppp) # point pattern plot of spatstat