Access a selection (combination with replacement) stored in an SPV instance by index.
Usage
## S4 method for signature 'SPV'
x[i, j, drop]
Arguments
x
an instance of SPV.
i
an index specifying the position of the sought selection.
j
not used.
drop
not used.
Details
The selection at index i of pseudo-vector x is not actually
stored in memory but calculated as needed. The extract method is used solely
for interpretation.
Value
the selection located at position i in pseudo-vector x