I have this matrix mymat. I know I can do table((mymat[,"col1"]) to get the number of each item in col1. However, I only want the count if there are unique values in col2. For mymat below, I want this result:
app gg chh
1 2 1
mymat
col1 col2
app d
app d
gg e
gg f
gg e
chh f
chh f
chh f