last_file_subprob: Get last file subproblem
Description
Get last file subproblem
Usage
last_file_subprob(xpdb, ext, .problem)
Value
The number of the last file subproblem as an integer
for the given `.problem` and file `ext`.
Arguments
- xpdb
An xpose database object.
- ext
The file extension to be used.
- .problem
The $problem number to be used.