The FCSIZE function returns information about
the size of a component. The syntax is:
R FCSIZE TIENO COMPONENT {PASS}
TIENO is the tie number you used to tie or create
the file (or the tie number returned by APLX if you tied or created it using 0
instead of your own tie number). If you
tied the file using a pass number, you must provide the same pass number, as
the PASS parameter.
The parameter COMPONENT is the component
number. This must be an integer in the
range Lowest existing component number to Highest existing component
number.
The explicit result is a two-element integer vector:
1. The size the variable would use if read into the workspace.
2.The size of the slot allocated to the component in the file, excluding the component
header.
Both are expressed in bytes.