Hi everybody, I'm trying to create a script that picks a txt file with 2 columns of coordinates (depth and variable1) and automatically tries to fit several polynomial with the function nls(). After that, it creates a list of observed, predict, residuals and other, and then it calculates AIC, RMSD, MAD and R^2. At the end of the script I create a series of vectors with MAD for all polynomials, RMSD for all polynomial and so on, and from a matrix a .csv file. This script is completely automatic, but there is a problem if one or more models don't fit, because if one or more data is missing I cannot create the vectors and the matrix, as well.
So, my question is: is it possible to create a vector with a missing object, substituting that object with NA in the vector? For example: I want to create this vector Vec1<-c(MAD1,MAD2,MAD3,MAD4) but MAD4 is missing and as a consequence R return an error like this: "object 'MAD4' not found" Is it possible to say to R that if it does not find an object it must substitute that object with NA in the vector? Many Thanks, Fabio Mr. Fabio Veronesi Ph.D. student Cranfield University, Bld.37 School of Applied Sciences MK43 0AL Cranfield, Bedfordshire Tel. +44 (0)7984049316 e-mail: f.veron...@cranfield.ac.uk [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.