[R] round() a data frame containing 'character' variables?

[David Winsemius]

On Aug 10, 2011, at 5:46 AM, Liviu Andronic wrote:

> Hello
>
> On Wed, Aug 10, 2011 at 11:41 AM, Dimitris Rizopoulos
> <d.rizopoulos at erasmusmc.nl> wrote:
>> One approach is the following:
>>
>> numVars <- sapply(iris, is.numeric)
>> iris[numVars] <- lapply(iris[numVars], round, digits = 2)
>> head(iris)
>>
> That's interesting, but still doesn't do what I need. Since it's a
> read-only View() operation I would like to avoid at all cost modifying
> the original data frame. And since my data frames are relatively big,
> I would like to avoid generating unnecessary copies. Basically I would
> need round() to ignore objects that it knows it cannot handle.

Then drop the assignment operation and just print:

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

Or set your digits argument to print:

print( head(iris), digits=1)

Or did I miss something?

-- 

David Winsemius, MD
West Hartford, CT