search for: spp4

Hi all, I have a vector of strings and need to count the number of times a string appears in the vector. eg: [1] spp6 spp10 spp6 spp6 spp4 spp2 spp9 spp10 spp5 spp2 spp2 spp3 [13] spp4 spp3 spp6 spp10 spp6 spp4 spp9 spp3 spp6 spp1 spp10 spp8 [25] spp2 spp10 spp9 spp7 spp1 spp3 spp8 spp6 spp3 spp8 spp6 spp5 [37] spp5 spp9 spp3 spp1 spp4 spp5 spp9 spp3 spp3 spp5 spp4 spp9 [49] spp3 spp7 spp7...

...sep = "") colnames(y1) <- paste("spp", 1:4, sep = "") y1 model.frame(~ y1) Error in model.frame(formula, rownames, variables, varnames, extras, extranames, : invalid variable type temp <- as.matrix(y1) model.frame(~ temp) temp.spp1 temp.spp2 temp.spp3 temp.spp4 1 3 1 0 1 2 0 1 1 0 3 0 0 1 0 4 0 0 1 1 5 0 1 1 1 Ideally the above wouldn't have names like temp.var1, temp.var2, but one could deal...