Check if All Elements in Character Vector are Numeric

Tests, without issuing warnings, whether all elements of a character vector are legal numeric values, or optionally converts the vector to a numeric vector. Leading and trailing blanks in x are ignored.

all.is.numeric(x, what = c("test", "vector", "nonnum"), extras=c('.','NA'))

Arguments

x

a character vector

what

specify what="vector" to return a numeric vector if it passes the test, or the original character vector otherwise, the default "test" to return FALSE if there are no non-missing non-extra values of x or there is at least one non-numeric value of x, or "nonnum" to return the vector of non-extra, non-NA, non-numeric values of x.

extras

a vector of character strings to count as numeric values, other than "".

Value

a logical value if what="test" or a vector otherwise

Author

Frank Harrell

See also

as.numeric

Examples

all.is.numeric(c('1','1.2','3'))
#> [1] TRUE
all.is.numeric(c('1','1.2','3a'))
#> [1] FALSE
all.is.numeric(c('1','1.2','3'),'vector')
#> [1] 1.0 1.2 3.0
all.is.numeric(c('1','1.2','3a'),'vector')
#> [1] "1"   "1.2" "3a" 
all.is.numeric(c('1','',' .'),'vector')
#> [1]  1 NA NA
all.is.numeric(c('1', '1.2', '3a'), 'nonnum')
#> [1] "3a"