search for: betula

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 platanoides,tree Ribes rubrum,shrub Calluna vulgaris,dwarf_shrub Betula alba,tree Primula veris,herb ...how can I create a new colu...

...ot of time. I try to give you an overview about my data frame. I have a data frame named "Baumdaten" and it has one column named "transectID" with different IDs (A_SEF ,A_LEF, B_SEF etc.) there is another column named "Baumart" with different species like Abies alba, Betula pendula, etc. I want to build now subsets and the first subset should be named A_2_SEF_Abies_alba and should contain all Abies alba that are living in A_2_SEF. So the normal code would be A_2_SEF_Abies_alba<-subset(Baumdaten,Baumart=="Abies alba"&pointID=="A_2_SEF") Th...

...12L, 31L, 30L, 17L, 16L, 4L, 5L, 3L, 25L, 22L, 20L, 24L, 21L, 26L, 27L, 19L, 2L, 18L, 32L, 33L), .Label = c("Abies balsamea", "Acer pensylvanicum", "Acer rubrum", "Acer saccharum", "Acer spicatum", "Amelanchier", "Betula alleghaniensis", "Betula papyrifera", "Cornus alternifolia", "Cornus canadensis", "Diervilla lonicera", "Dirca palustris", "Fagus grandifolia", "Fraxinus americana", "Fraxinus nigra", "Lonicera...