[R] aggregate output to data frame

Dear users, i am trying to summarize data using "aggregate" with the following command: aggregate(pcr$Ct,c(pcr["Gene"],pcr["Type"],pcr["Rep"]),FUN=function(x){c(mean(x), sd(x), sd(x)/sqrt(sd(x)))}) and the structure of the resulting data frame is 'data.frame':66 obs. of  4 variables: $

[R] memory usage upon web-query using try function

Dear Community, my program below runs quite slow and I'm not sure whether the http-requests are to blame for this. Also, when running it gradually increases the memory usage enormously. After the program finishes, the memory is not freed. Can someone point out a problem in the code? Sorry my

[R] dynamic network analysis

Dear group, I am browsing the web to find suitable software for dynamic network analysis. I came across the sna-package under R, but this seems to do static analysis only. Is this right? Or is there a separate package for dynamic network analysis? Thanks

[R] Multiplication of data frame with vector

Dear group: sorry for my beginners question, but I'm rather new to R and was searching high and low without success: I have a data frame (df) with variables in the rows and observations in the columns like (the actual data frame has 15 columns and 1789 rows): early1 early2 early3