Hi everyone, I looking for functions or systematic ways to do calculations between different columns and rows in R, as one can do easily in Excel. For example, I have two variables, a and b, where a1 represents an a value in row 1, and b2 represents a b value in row 2, etc.
a <- c(4,3,5,5,6,7,3,2,1,4) b <- c(2,4,1,2,5,3,1,8,7,5) data <- cbind(a,b) I have to calculate something like this: x1 = NA x2 = -b1 /24 * a1 + b2 /2 * a2 + b3 /24 * a3 x3 = -b2 /24 *a2 + b3 /2 * a3 + b4 /24 * a4 x4 = -b3 /24 *a3 + b4 /2 * a4 + b5 /24 * a5 ... x9 = -b8 /24* a8 + b9 /2 * a9 + b10 /24 * a10 x10= NA For example, x2 would be equal to: -2/24*4 +4/2*3 + 1/24 *5 Any ideas? Thank you in advance. -- Sebastián Daza ______________________________________________ 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.
