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Generate random compositions that sum to <=1
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## Generate random compositions that sum to <=1 | |
library(gtools) | |
library(ggtern) | |
library(scatterplot3d) | |
rCompos <- function(n, subsamples, alphas = NULL){ | |
if(is.null(alphas)) alphas <- rep(1, subsamples) | |
sums <- matrix(runif(n), ncol = 1) | |
dirichlet <- gtools::rdirichlet(n, alphas) | |
output <- apply(dirichlet, 2, function(x) sums*x) | |
return(output) | |
} | |
## Generate test data: | |
mydata <- rCompos(n = 10000, subsamples = 3) | |
rowSums(mydata) | |
## Check evenness of sampling across sum component | |
hist(rowSums(mydata), 100) | |
## Check evenness of sampling across proportional component | |
ggtern(data = data.frame(mydata), aes(x=X1, y=X2, z=X3))+ | |
geom_hex_tern()+ | |
theme_bw() | |
## Check evenness of sampling in 3 dimensions | |
scatterplot3d::scatterplot3d(mydata) | |
scatterplot3d::scatterplot3d(mydata, angle = 180) |
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