checking NA values and ignoring them
138417
LBYL vs EAFP in Java?
132104
Removing not-a-number entries from an array of numbers
67583
MySQL strip non-numeric characters to compare
35850
Using regular expressions to validate a numeric range
125934
Minimize absolute values of errors instead of squares
43747
Remove rows with all or some NAs (missing values) in data.frame
73947
How to remove a line of a matrix if not all elements are numeric?
134785
How to check any missing number from a series of numbers?
88445
strptime, as.POSIXct and as.Date return unexpected NA
17652
Compare two strings by ignoring certain characters
119496
Standardizing variables with negative values in R
40329
read.csv blank fields to NA
72432
data.frame without ruining column names
18759
Ignore python multiple return value
110451
How to check if a string is numeric?
66024
Output in R, Avoid Writing "[1]"
5933
How to negate a specific symbol?