search for: quesri

This is a very simple question but I couldn't form a site search quesry that would return a reasonable result set. Say I have a vector: x <- c(0,2,3,4,5,-1,-2) I want to replace all of the values in 'x' with the log of x. Naturally this runs into problems since some of the values are negative or zero. So how can I replace all of the positive elements of x with the log(x) and the

hello everyone, I am Maheshwar, a prefinal year Computer Science undergraduate student at BITS-Pilani, India. When i was going through the GSOC ideas , i felt interested in Quesry parser project. Till now i have implemented a couple of LL(1) parsers as a part of my assignment in Compiler construction course, so i would love to join and contribute to this project. So can any one tell me how to go

Moi! I was helping to teach a course on mixed models this week, and we came across a problem with coding more than one random effect in lme when they aren't nested. As an example, suppose we have an experiment where we sample moths from several populations, and place the moths on different trees, and measure a trait (in this case survival of offspring, but that's less important). We