# \donttest{
set.seed(123)
mat1 = rbind(cbind(matrix(rnorm(50*5, mean = 1), nr = 50),
matrix(rnorm(50*5, mean = -1), nr = 50)),
cbind(matrix(rnorm(50*5, mean = -1), nr = 50),
matrix(rnorm(50*5, mean = 1), nr = 50))
)
rownames(mat1) = paste0("R", 1:100)
colnames(mat1) = paste0("C", 1:10)
mat1 = mat1[sample(100, 100), ] # randomly permute rows
split = sample(letters[1:5], 100, replace = TRUE)
spilt = factor(split, levels = letters[1:5])
col_fun1 = colorRamp2(c(-2, 0, 2), c("blue", "white", "red"))
circos.heatmap(mat1, split = split, col = col_fun1)
circos.clear()
# }
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