r apply data frame
Is it each ROW in the data frame, one by one, or each column, or the entire frame in one shot? What I want to do apply a function to each row in ...,Lapply and sapply: avoiding loops on lists and data frames. The regular apply() function can be used on a data frame since a data frame is a type of matrix. When you use it on the columns of a data frame, passing the number 2 for the second argument, it d,When your data is in the form of a list, and you want to perform calculations on each element of that list in R, the appropriate apply function is lapply(). , How To Use apply() in R. X is an array or a matrix if the dimension of the array is 2; MARGIN is a variable defining how the function is applied: when MARGIN=1 , it applies over rows, whereas with MARGIN=2 , it works over columns. FUN , which is the func, This is an introductory post about using apply, sapply and lapply, best ... As a commenter pointed out, if you are using a data frame the data ..., Is this what you want? Note that both tmp[, 4:16] and tmp[, 2] are using the same row i . set.seed(4542) # make it reproducible tmp ..., When I started with R, and didn't understand the apply family well, ... 1:56] <- as.data.frame(lapply(df[, 1:56], FUN = function(x) sapply(x, FUN ..., One option would be: dat[] <- lapply(dat, function(x) if(is.factor(x)) as.numeric(levels(x))[x] else x)., You can exclude the non-numeric columns/rows and deploy apply function onto the numeric rows. Consider an example: If a data frame has 4 ..., dat <- data.frame(x=c(1,2), y=c(3,4), z=c(5,6)) apply(dat[,c('x','z')], 1, ..... The downside is that I believe R will make a copy of your data table.
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 r apply data frame 相關參考資料
R help - lapply with data frame - R Nabble
Is it each ROW in the data frame, one by one, or each column, or the entire frame in one shot? What I want to do apply a function to each row in ... http://r.789695.n4.nabble.com The Apply Family of Functions
Lapply and sapply: avoiding loops on lists and data frames. The regular apply() function can be used on a data frame since a data frame is a type of matrix. When you use it on the columns of a data fr... http://faculty.nps.edu How to Traverse a List or Data Frame with R Apply Functions - dummies
When your data is in the form of a list, and you want to perform calculations on each element of that list in R, the appropriate apply function is lapply(). https://www.dummies.com R tutorial on the Apply family of functions (article) - DataCamp
How To Use apply() in R. X is an array or a matrix if the dimension of the array is 2; MARGIN is a variable defining how the function is applied: when MARGIN=1 , it applies over rows, whereas with MA... https://www.datacamp.com Using apply, sapply, lapply in R | R-bloggers
This is an introductory post about using apply, sapply and lapply, best ... As a commenter pointed out, if you are using a data frame the data ... https://www.r-bloggers.com R apply for two data frames - Stack Overflow
Is this what you want? Note that both tmp[, 4:16] and tmp[, 2] are using the same row i . set.seed(4542) # make it reproducible tmp ... https://stackoverflow.com Apply function to every value in an R dataframe - Stack Overflow
When I started with R, and didn't understand the apply family well, ... 1:56] <- as.data.frame(lapply(df[, 1:56], FUN = function(x) sapply(x, FUN ... https://stackoverflow.com R Apply function on data frame columns - Stack Overflow
One option would be: dat[] <- lapply(dat, function(x) if(is.factor(x)) as.numeric(levels(x))[x] else x). https://stackoverflow.com In R, how do I use apply() with data frames? - Stack Overflow
You can exclude the non-numeric columns/rows and deploy apply function onto the numeric rows. Consider an example: If a data frame has 4 ... https://stackoverflow.com Call apply-like function on each row of dataframe with multiple ...
dat <- data.frame(x=c(1,2), y=c(3,4), z=c(5,6)) apply(dat[,c('x','z')], 1, ..... The downside is that I believe R will make a copy of your data table. https://stackoverflow.com |