R Under development (unstable) (2025-02-26 r87830 ucrt) -- "Unsuffered Consequences"
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> library("flexclust")
> 
> x <- matrix(runif(1000, 0, 1), ncol=2)
> 
> set.seed(1)
> cl0 <- kcca(x, k=20)
> cl1 <- kcca(x, k=20, weights=x[,1])
> cl2 <- kcca(x, k=20, weights=x[,2])
> 
> pdf("weights.pdf")
> plot(cl0)
> plot(cl1)
> plot(cl2)
> 
> m1 <- colMeans(cl1@centers)
> m2 <- colMeans(cl2@centers)
> 
> stopifnot(diff(m1)<0)
> stopifnot(diff(m2)>0)
> 
> 
> proc.time()
   user  system elapsed 
   0.59    0.17    0.75