Hi Michael,
I was expecting this to just work:
base::lengths(IntegerList(1:4, 1:6))
but it doesn't:
Error in base::lengths(IntegerList(1:4, 1:6)) :
'x' must be a list or atomic vector
The man page says:
This function loops over ‘x’ and returns a compatible vector
containing the length of each element in ‘x’. Effectively,
‘length(x[[i]])’ is called for all ‘i’, so any methods on ‘length’
are considered.
If length(x[[i]]) is called for all i then it should work on any object
for which [[ is defined. Note that this is what happens with
base::sapply(), base::mapply(), etc... they all use [[ internally.
Do you know of any reason why lengths() doesn't do this?
Thanks,
H.
On 09/28/2015 09:51 PM, Michael Lawrence wrote:
That is the plan. Note that we already have elementLengths() that serves
the same purpose. It was the direct inspiration for lengths().
On Mon, Sep 28, 2015 at 9:41 PM, Peter Hickey <peter.hic...@gmail.com>
wrote:
The lengths() function was added in R 3.2 to "get the length of each
element of a list or atomic vector (is.atomic) as an integer or numeric
vector." It seems useful to me to have also a similar method defined for
the S4Vectors::List class (and subclasses). What do others think?
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Hervé Pagès
Program in Computational Biology
Division of Public Health Sciences
Fred Hutchinson Cancer Research Center
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