Print the Nth Row in a List of Data Frames

Question

I am cleaning several excel files in R. They unfortunately are of unequal dimensions, rows and columns. Currently I am storing each excel sheet as a data frame in a list. I

Answer 1

There is no need for a wrapper function, just use lapply and pass it a blank argument at the end (to represent the columns)

lapply(df.list, `[`, 4, )

This also works with any type of row argument that you would normally use in myDF[ . , ] eg: lapply(df.list,[, c(2, 4:6), )

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I would suggest that if you are going to use a wrapper function, have it work more like [ does: eg

Grab(df.list, 2:3, 1:5) would select the second & third row and first through 5th column of every data.frame and Grab (df.list, 2:3) would select the second & third row of all columns

Grab <- function(ll, rows, cols) {
    if (missing(cols))
        lapply(ll, `[`, rows, )
    else 
        lapply(ll, `[`, rows, cols)
}

Grab (df.list, 2:3)