marciarr wrote: > Hello R users, > I have been looking through Help files and Nabble list for the answers for > these simple questions, but it seems to be fruitless. > 1- in a data frame with two columns, x and y, how do I get the corresponding > value of x to, let's say, the minimum value of the y column (min (data$y)) ? > data$x2[data$x1==min(data$x1)] > 2- how do I solve a simple equation? Considering the equation y= exp(-x)^12, > I would like to find the values of x for, for example, y=0.01, so > exp(-x)^12=0.01. How do I do that using R? > I know there is solve for linear equations, but I do not know if there is a generic solver for other equations. You could implement it using a numerical approach (perhaps it is yet in some package).
domenico ______________________________________________ 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.
