I have a vector of different string elements. I would like to plot all possible combination of the strings in that vector.Is there a more effective method? I'm also looking for advice about better ways of handling large string vectors.vc = c(ER,Ff,ac,al,NV) for(i in vc ){  for(j in vc){    ggplot(rt_engine_data,aes_string(i,j))+geom_point(aes(colour = factor(ft_state)),alpha =1/2)+geom_smooth()+scale_size_area()+      ggtitle(paste(i, vs ,j,sep = ))+scale_colour_brewer(palette = Set1)  }}
Loop variables over vector to plot all combination graphs in R
strings;r