How to get this data structure in R?

Question

I am trying to find Wanted data structure from the current data structure. I know the schematics of the expected data structure partially. The wanted data structure includ

Answer 1

We can use tidyverse

library(tidyverse)
dat.m %>% 
    as.data.frame() %>% 
    rownames_to_column('Vars') %>%
    rename(M1 = V1, M2 = V2)
#     Vars  M1 M2
#1 ave_max 150 61
#2     ave  60  0
#3    lepo  41  0

---

If we need to use data.table

library(data.table)
setnames(setDT(as.data.frame(dat.m), keep.rownames = TRUE), c('Vars', 'M1', 'M2'))[]