Bioequivalence and Bioavailability Forum • Data frame challenge

Data frame challenge [🇷 for BE/BA]

posted by mittyri – Russia, 2016-12-18 02:41 (3106 d 22:03 ago) – Posting: # 16851
Views: 4,924

Hi ElMaestro,

I'd like

A=read.table("SomeFile.csv", header=T, stringsAsFactors = F, sep=",")

apply(A, 2, function(x){

       as.numeric(replace(x, 

         !grepl("[-]?[0-9]+[.]?[0-9]*|[-]?[0-9]+[L]?|[-]?[0-9]+[.]?[0-9]*[eE][0-9]+",x), 0))})

But more readable would be

A=read.table("SomeFile.csv", header=T, stringsAsFactors = F, sep=",")

checkandreplace <- function(x){

  # which values are looking not as a numeric?

  isnotnumeric <- !grepl("[-]?[0-9]+[.]?[0-9]*|[-]?[0-9]+[L]?|[-]?[0-9]+[.]?[0-9]*[eE][0-9]+",x)

  # we need to replace them with 0

  replaced0 <- replace(x, isnotnumeric, 0)

  # and to convert it all to numeric

  return(as.numeric(replaced0))

}

apply(A, 2, checkandreplace)

Enjoy!

—
Kind regards,
Mittyri

Complete thread:

Data frame challenge ElMaestro 2016-12-17 19:40
- Data frame challengemittyri 2016-12-18 01:41
  - Data frame challenge ElMaestro 2016-12-18 11:47
- Data frame challenge wligtenberg 2016-12-19 14:29
- Data frame challenge zizou 2016-12-19 18:41
  - Data frame challenge ElMaestro 2016-12-19 21:06