How can I obtain a dataframe from an array?

I’d like to transform my array into a dataframe, with the column "Cluster" where there will be the numbers 5,4,2,1, … and "Trend" with numbers 1,2,3,4,…

           [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [,11] 
  cluster    5    4    2    1    2    4    1    2    2     5     1    

What I expect :

               Trend               Cluster
               1                   5
               2                   4
               3                   2
               4                   1
               ...

>Solution :

With data.frame:

data.frame(Trend = seq_along(mat), t(mat))

#   Trend cluster
# 1     1       5
# 2     2       4
# 3     3       2

Reproducible data:

mat <- t(c(5, 4, 2))
rownames(mat) <- "cluster"