round() a data frame containing 'character' variables?

numVars <- sapply(iris, is.numeric)
iris[numVars] <- lapply(iris[numVars], round, digits = 2)
head(iris)

Then drop the assignment operation and just print:

( lapply(iris[numVars], round, digits = 2) )

That's a nice catch, thanks. The only problem with this approach is
that non-numeric variables are simply discarded, while I would prefer
for them to be simply ignored.

Or set your digits argument to print:

print( head(iris), digits=1)

Or did I miss something?

As I explained in today's reply to Martin, print(..., digits = 2) and
format(..., digits = 2) both display a "minimal number of
_significant_ digits". However, for various reasons, I need to specify
the "number of decimal places" as in round(..., digits = 2). Both
print() and format() don't provide an obvious way to do that.

Regards
Liviu