Hmisc (version 5.2-1)

all.is.numeric: Check if All Elements in Character Vector are Numeric

Description

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.

Usage

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

Value

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

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 "".

Author

Frank Harrell

See Also

as.numeric

Examples

all.is.numeric(c('1','1.2','3'))
all.is.numeric(c('1','1.2','3a'))
all.is.numeric(c('1','1.2','3'),'vector')
all.is.numeric(c('1','1.2','3a'),'vector')
all.is.numeric(c('1','',' .'),'vector')
all.is.numeric(c('1', '1.2', '3a'), 'nonnum')