convert object of class “dist” into data frame in r

Question

if possible to convert a data frame to an object of class \"dist\" is it possible to do just the opposite? convert class \"dist\" to data frame? for example

< dist(ha

Answer 1

I would do something like this ..

library(reshape)
set.seed(123)

mat <- matrix(rnorm(25),ncol=5,nrow=5,byrow=T) # Creating a 5 X 5 matrix
d   <- dist(mat)

df  <- melt(as.matrix(d)) #Converting the dist object to matrix while using melt

p    <- t(apply(df[,c(1,2)],1,FUN=sort))
rmv1 <- which(p[,1] == p[,2])

p    <- paste(p[,1],p[,2],sep="|")
rmv2 <- which(duplicated(p))

df   <- df[-c(rmv1,rmv2),] #removing self distances and duplicated distances

df
X1 X2    value
2  1 3.812287
3  1 2.311832
4  1 4.385048
5  1 2.854179
3  2 1.916895
4  2 1.557744
5  2 2.880357
4  3 2.509214
5  3 2.886526
5  4 3.408147