DeaR useRs: Excuses by my English. I have a problem with 'expression' function.
For example: a<-expression(exp(-x^2)) b<-expression(exp(x^2)) And I want to calculate: a*b And R returns: Error in a * b : non-numeric argument to binary operator I don't know what happend. Which is the way to making operations with expressions? Thanks. ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html