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exists function on list objects gives always a FALSE

Duncan Murdoch
On 5/19/2009 12:07 PM, ?rout?k wrote:
There is no variable with name "SmoothData$span", there is an element of 
SmoothData with name "span".

To test for that, the safest test is probably

"span" %in% names(SmoothData)

but a common convention is to use

is.null(SmoothData$span)

because NULL elements are rare in lists.

Duncan Murdoch

Thread (8 messages)

Žroutík exists function on list objects gives always a FALSE May 19 Linlin Yan exists function on list objects gives always a FALSE May 19 Wacek Kusnierczyk exists function on list objects gives always a FALSE May 19 Duncan Murdoch exists function on list objects gives always a FALSE May 19 Romain Francois exists function on list objects gives always a FALSE May 19 Wacek Kusnierczyk exists function on list objects gives always a FALSE May 19 Stavros Macrakis exists function on list objects gives always a FALSE May 19 Wacek Kusnierczyk exists function on list objects gives always a FALSE May 19