This function detects which numeric columns in a data frame contain only whole numbers, and converts those columns to integer class, so that they take up less space.
a data frame containing possibly integer columns classified as "numeric".
The function returns a data frame with the same columns as 'data', but with those that are numeric and contain only whole numbers (possibly including NA) now classified as "integer".
A. Marcia Barbosa
dat <- data.frame( var1 = 1:10, var2 = as.numeric(1:10), var3 = as.numeric(c(1:4, NA, 6:10)), var4 = as.numeric(c(1:3, NaN, 5, Inf, 7, -Inf, 9:10)), var5 = as.character(1:10), var6 = seq(0.1, 1, by = 0.1), var7 = letters[1:10] ) # creates a sample data frame dat str(dat) # var2 classified as "numeric" but contains only whole numbers # var3 same as var2 but containing also NA values # var4 same as var2 but containing also NaN and infinite values # var5 contains only whole numbers but initially classified as factor dat <- integerCols(dat) str(dat) # var2 and var3 now classified as "integer" # var4 remains as numeric because contains infinite and NaN # (not integer) values # var5 remains as factor
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