capacity - Returns the capacity of an array.
array capacity -> n
[1] capacity -> 100
101 array capacity -> 200
Returns the number of elements that a given array
can hold without being re-sized.
The default size for an array is 100. If it is bigger,
its size is readjusted to a factor of 100. The number of elements
in an array is given by length.
docu by Sirko Straube
/var/www/debian/nest/nest-simulator-2.20.0/sli/slidata.cc