search for: mynicefunct

...ervations,habitats=habitats) aggregate() is not suitable for my purpose because I want a result respecting the order of the habitats encountered although they may have the same name (and not pooling each group on each level of the factor created). For instance, the output of the ideal function mynicefunction() would be something as: mynicefunction(transect$observations, by=list(transect$habitats),sum) meadow 16 forest 9 meadow 21 pasture 17 and not aggregate(transect$observations,by=list(transect$habitats),sum) Group.1 x 1 forest 9 2 meadow 37 3 pasture 17 Did anybody hear...