Help to check data before putting it in a database
Hi Ulisses,
Look at the functions ?match and ?rbind
If you do not want to do it by hand, you can make a little function as below.
HTH,
Josh
d1 <- data.frame(goals = 4:1, players = LETTERS[1:4])
d2 <- data.frame(goals = c(1, 3, 2, 5), players = LETTERS[3:6])
f <- function(old, new, check) {
index <- new[, check] %in% old[, check]
dat <- rbind(old, new[index, ])
tocheck <- new[!index, ]
list(merged = dat, tocheck = tocheck)
}
dmerged <- f(d1, d2, "players")
## check "tocheck" and once it is correct
dfinal <- do.call("rbind", dmerged)
On Tue, Apr 5, 2011 at 8:06 AM, Ulisses.Camargo
<moliterno.camargo at gmail.com> wrote:
The example scene: I have a database with stats about each goal made by my soccer team. This database (a data frame in R) is organized in lines (goals) with a set of columns containing data about these goals (player name, tactic position, etc). For now, this database will be called "data.frame1". What I need is to feed this "data.frame1" with new information about my team goals. I will call this new information "data.frame2". This set of new goals is organized in the same way as in "data.frame1" (equal numbers of cols). Where help is needed: I need help in finding a way to check the player-name column in "data.frame2" before feeding "data.frame1" with it. What I need is a way to verify the name of the player on each line of "data.frame2" with the names of players that already exist on a col in "data.frame1". Moreover, I need R to make two main things: First, the lines of ?data.frame2? with player names that already exists in ?data.frame1? must be added to ?data.frame1?. Second: lines of ?data.frame2? with player names that does not exist on ?data.frame1? must be listed in an output to be manually checked and corrected. After this verification, corrected lines and new-player-names lines must be incorporated in "data.frame1". What I want is to guarantee that will be no lines with wrong player names in my database. At the same time, my script must permit new information to be added (new player names). Is there somebody who could help me with this? Thanks for your attention Best wishes Ulisses -- View this message in context: http://r.789695.n4.nabble.com/Help-to-check-data-before-putting-it-in-a-database-tp3428318p3428318.html Sent from the R help mailing list archive at Nabble.com.
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Joshua Wiley Ph.D. Student, Health Psychology University of California, Los Angeles http://www.joshuawiley.com/