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SAVE /OUTFILE={’file_name’,file_handle} /UNSELECTED={RETAIN,DELETE} /{UNCOMPRESSED,COMPRESSED,ZCOMPRESSED} /PERMISSIONS={WRITEABLE,READONLY} /DROP=var_list /KEEP=var_list /VERSION=version /RENAME=(src_names=target_names)… /NAMES /MAP
The SAVE
procedure causes the dictionary and data in the active
dataset to
be written to a system file.
OUTFILE is the only required subcommand. Specify the system file to be written as a string file name or a file handle (see File Handles).
By default, cases excluded with FILTER are written to the system file.
These can be excluded by specifying DELETE
on the UNSELECTED
subcommand. Specifying RETAIN
makes the default explicit.
The UNCOMPRESSED
, COMPRESSED
, and
ZCOMPRESSED
subcommand determine the system file’s
compression level:
UNCOMPRESSED
Data is not compressed. Each numeric value uses 8 bytes of disk space. Each string value uses one byte per column width, rounded up to a multiple of 8 bytes.
COMPRESSED
Data is compressed with a simple algorithm. Each integer numeric value between -99 and 151, inclusive, or system missing value uses one byte of disk space. Each 8-byte segment of a string that consists only of spaces uses 1 byte. Any other numeric value or 8-byte string segment uses 9 bytes of disk space.
ZCOMPRESSED
Data is compressed with the “deflate” compression algorithm
specified in RFC 1951 (the same algorithm used by
gzip
). Files written with this compression level cannot be
read by PSPP 0.8.1 or earlier or by SPSS 20 or earlier.
COMPRESSED
is the default compression level. The SET command
(see SET) can change this default.
The PERMISSIONS
subcommand specifies permissions for the new system
file. WRITEABLE, the default, creates the file with read and write
permission. READONLY creates the file for read-only access.
By default, all the variables in the active dataset dictionary are written
to the system file. The DROP
subcommand can be used to specify a list
of variables not to be written. In contrast, KEEP specifies variables
to be written, with all variables not specified not written.
Normally variables are saved to a system file under the same names they
have in the active dataset. Use the RENAME
subcommand to change these names.
Specify, within parentheses, a list of variable names followed by an
equals sign (‘=’) and the names that they should be renamed to.
Multiple parenthesized groups of variable names can be included on a
single RENAME
subcommand. Variables’ names may be swapped using a
RENAME
subcommand of the
form /RENAME=(A B=B A)
.
Alternate syntax for the RENAME
subcommand allows the parentheses to be
eliminated. When this is done, only a single variable may be renamed at
once. For instance, /RENAME=A=B
. This alternate syntax is
deprecated.
DROP
, KEEP
, and RENAME
are performed in
left-to-right order. They
each may be present any number of times. SAVE
never modifies
the active dataset. DROP
, KEEP
, and RENAME
only
affect the system file written to disk.
The VERSION
subcommand specifies the version of the file format. Valid
versions are 2 and 3. The default version is 3. In version 2 system
files, variable names longer than 8 bytes are truncated. The two
versions are otherwise identical.
The NAMES
and MAP
subcommands are currently ignored.
SAVE
causes the data to be read. It is a procedure.
Next: SAVE DATA COLLECTION, Previous: IMPORT, Up: System and Portable File I/O [Contents][Index]