|
CART and MARS continue to read data stored in the
legacy SYSTAT format, a binary (i.e., not
human-readable) format widely used by statisticians and
researchers using the SYSTAT statistical programs.
Relative to comma-separated-text and some other binary
formats, the legacy SYSTAT format is quite restrictive
(limited variable name lengths, limited lengths of
character data). We do not recommend that you use it.
However...
For our clients that do need to work with this format,
we provide the following C and Fortran programs that
illustrate how legacy SYSTAT datasets are structured.
Originally, legacy SYSTAT format was written and read
with Fortran code. Thus, the format must accomodate the
record segmentation and padding typical of Fortran I/O
-- so the C version handles these issues explicitly.
Click here to obtain LFR.F -- the Fortran 77 legacy SYSTAT file reader source. LFR
is written entirely in Fortran 77. Record padding is handled implicitly by the Fortran I/O system. The user is prompted
for an input legacy SYSTAT set. The data are echoed to the console in comma-delimited as confirmation.
Click here to obtain CLFR.C -- the C legacy SYSTAT file reader source. CLFR is
written entirely in C. Record padding is handled explicitly to match the Fortran conventions. You must give the input
file name as the first command line argument. If you give an output file name as the second command line argument,
data will be written to that file in comma-delimited for as confirmation, otherwise data are written to stdout.
Both are portable in the sense they accomodate both
Unix and Windows compilation platforms.
|
