# R/disttransform.R In BiodiversityR: Package for Community Ecology and Suitability Analysis

#### Defines functions `disttransform`

````disttransform` <-
function(x, method="hellinger") {
x <- as.matrix(x)
METHODS <- c("hellinger", "chord", "profiles", "chi.square", "log", "square", "pa",
"Braun.Blanquet", "Domin", "Hult", "Hill", "fix", "coverscale.log", "dispweight")
method <- match.arg(method,METHODS)
switch(method, hellinger = {
x <- decostand(x,"hellinger")
}, profiles = {
x <- decostand(x,"total")
}, chord = {
x2 <- x^2
rowtot <- apply(x2,1,sum)
for (i in 1:length(rowtot)) {if (rowtot[i]==0) {rowtot[i] <- 1}}
rowtot <- rowtot^0.5
x <- x/rowtot
}, chi.square = {
x <- decostand(x, "chi.square")
}, log = {
x <- log(x+1)
}, square = {
x <- x^0.5
}, pa = {
x <- decostand(x, "pa")
#
}, Braun.Blanquet = {
x <- coverscale(x, "Braun.Blanquet")
}, Domin = {
x <- coverscale(x, "Domin")
}, Hult = {
x <- coverscale(x, "Hult")
}, Hill = {
x <- coverscale(x, "Hill")
}, fix = {
x <- coverscale(x, "fix")
}, coverscale.log = {
x <- coverscale(x, "log")
}, dispweight = {
x <- dispweight(x)
})
#
for (i in 1:ncol(x)) {x[,i] <- as.numeric(x[,i])}
x <- data.frame(x)
return(x)
}
```

## Try the BiodiversityR package in your browser

Any scripts or data that you put into this service are public.

BiodiversityR documentation built on Jan. 6, 2023, 5:18 p.m.