search for: spp3

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 spp2 spp6 spp5 spp7 spp4 spp8 spp9...

Dear list, given this formula: > fmla <- formula(y1 ~ spp1 + spp2 + spp3 + spp5) > fmla[[3]] spp1 + spp2 + spp3 + spp5 is this the intended behaviour of as.character: > as.character(fmla[[3]]) [1] "+" "spp1 + spp2 + spp3" "spp5" ? Where does the extra "+" come from? > as.character(fmla) [1] "~&qu...

...xes. I'm doing this now with mtext and entering spaces to make them center. There must be a better way. Much thanks, Andy ####################### myDF1 <- data.frame(spp1 = c(0,0,0,0,1,0,1,1,0,0,0,1), spp2 = c(1,0,1,1,0,0,0,0,1,0,0,0), spp3 = c(0,1,0,0,0,1,0,0,0,1,1,0), aVar = runif(12, 1, 10) + 1:12) myDF2 <- data.frame(spp1 = c(1,1,0,0,0,0,0,0,1,0,0,1), spp2 = c(0,0,1,1,0,0,0,1,0,0,1,0), spp3 = c(0,0,0,0,1,1,1,0,0,1,0,0), aVar =...

...ot;, 1:5, 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 c...