Hi folks, I have a script that will evaluate a single equation for a vector and write graphs to a folder: --------------------------------------------------------------------------------------------------------- species.name="CussoniaHolstii" dia<-10:100 biomass.equals<-21.4863 + 0.5797 * (dia ^ 2) jpeg(paste(species.name, '.jpg', sep = '')) plot (biomass.equals, main=species.name, xlab="dbh in cm", ylab="biomass in kg") dev.off() ------------------------------------------------------------------------------------------------ I have a table that includes vectors species.name and biomass.equals, which are as you see examples above, a series of names and a corresponding equation. I would like R to evaluate each biomass equation for each species by the variable it contains, dia, but when importing the .csv the "biomass.equals" field is read as a factor. Is there a way to coerce R to read each equation as it reads it in the above code, as an equation that contains a variable? Perhaps something in methods(as)? Is there a help file for each of those? Or should I do something altogether different? Appreciate any help. Best *Ben Caldwell* [[alternative HTML version deleted]]