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359101
2010 Nov 09
2
new column from column in another df
If I have a data frame where a species occupies several rows with different
phases such as (both col's ar factors):
species,phase
Populus tremula,1
Populus tremula,2
Populus tremula,3
Calluna vulgaris,1
Calluna vulgaris,2
Betula alba,1
Betula alba,2
Betula alba,3
Primula veris,1
Primula veris,2
and another df where each species only have one row:
species,growth_form
Populus tremula,tree
Acer