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...would be added if I have to check if the dataframe is a zero rows one BEFORE the merge (in fact I do a sequence of several merge) Is this behaviour of the merge command correct? Why did the developers choose it? P.S.: I tested this code both in R 2.3.0 and in 2.3.1 Thank you in advance. Sandro Bonfigli

...cess (delete the first row > 50, find the second row > 50, examine if there are rows in the middle) but it is quite inelegant as if the first value is not the "good" one I have to repeat the process for a a priori unknown number of times. Thanks in advance for Your help Sandro Bonfigli

Estimados, Quisiera saber cuanto es el tamaño máximo de datos contenidos en mi base de datos, que el software R puede llegar a procesar y soporta. De antemano agradezco y envió un cordial saludo. Marcela Corrales CPData Optimum [[alternative HTML version deleted]]

...I tried to remove the list in various ways without success; for example I explored the function unlist but > class(unlist(example$second[3])) "numeric" and this means that > nrow(unlist(example$second[3])) doesn't return 0 I'd be grateful for any suggestion TIA Sandro Bonfigli

Hello Experts, how can I use variables in the RODBC environment. Example which does not work: Thanks for your help. Thorsten pn <- '39R5238'; library(RODBC); odbcobj <- odbcConnect("SQUIT21C",uid="muehge",pwd="xxx"); sql <- "select u.unitid, from test where part in ('pn') "; parameter <- sqlQuery(odbcobj,sql);