(octave.info)System Information
36.11 System Information
========================
-- : computer ()
-- : C = computer ()
-- : [C, MAXSIZE] = computer ()
-- : [C, MAXSIZE, ENDIAN] = computer ()
-- : ARCH = computer ("arch")
Print or return a string of the form CPU-VENDOR-OS that identifies
the type of computer that Octave is running on.
If invoked with an output argument, the value is returned instead
of printed. For example:
computer ()
⊣ i586-pc-linux-gnu
mycomp = computer ()
⇒ mycomp = "i586-pc-linux-gnu"
If two output arguments are requested, also return the maximum
number of elements for an array. This will depend on whether
Octave has been compiled with 32-bit or 64-bit index vectors.
If three output arguments are requested, also return the byte order
of the current system as a character ("B" for big-endian or "L" for
little-endian).
If the argument "arch" is specified, return a string indicating the
architecture of the computer on which Octave is running.
See also: Note: isunix, Note: ismac, Note:
ispc.
-- : [UTS, ERR, MSG] = uname ()
Return system information in the structure.
For example:
uname ()
⇒ {
sysname = x86_64
nodename = segfault
release = 2.6.15-1-amd64-k8-smp
version = Linux
machine = #2 SMP Thu Feb 23 04:57:49 UTC 2006
}
If successful, ERR is 0 and MSG is an empty string. Otherwise, ERR
is nonzero and MSG contains a system-dependent error message.
-- : nproc ()
-- : nproc (QUERY)
Return the current number of available processors.
If called with the optional argument QUERY, modify how processors
are counted as follows:
‘all’
total number of processors.
‘current’
processors available to the current process.
‘overridable’
same as ‘current’, but overridable through the
‘OMP_NUM_THREADS’ environment variable.
-- : ispc ()
Return true if Octave is running on a Windows system and false
otherwise.
See also: Note: isunix, Note: ismac.
-- : isunix ()
Return true if Octave is running on a Unix-like system and false
otherwise.
See also: Note: ismac, Note: ispc.
-- : ismac ()
Return true if Octave is running on a Mac OS X system and false
otherwise.
See also: Note: isunix, Note: ispc.
-- : isieee ()
Return true if your computer _claims_ to conform to the IEEE
standard for floating point calculations.
No actual tests are performed.
-- : isdeployed ()
Return true if the current program has been compiled and is running
separately from the Octave interpreter and false if it is running
in the Octave interpreter.
Currently, this function always returns false in Octave.
-- : isstudent ()
Return true if running in the student edition of MATLAB.
‘isstudent’ always returns false in Octave.
See also: Note: false.
-- : OCTAVE_HOME ()
Return the name of the top-level Octave installation directory.
OCTAVE_HOME corresponds to the configuration variable PREFIX.
See also: Note: EXEC_PATH, *note IMAGE_PATH:
XREFIMAGE_PATH, Note: OCTAVE_EXEC_HOME.
-- : OCTAVE_EXEC_HOME ()
Return the name of the top-level Octave installation directory for
architecture-dependent files. If not specified separately, the
value is the same as OCTAVE_HOME. OCTAVE_EXEC_HOME corresponds to
the configuration variable EXEC_PREFIX.
See also: Note: EXEC_PATH, *note IMAGE_PATH:
XREFIMAGE_PATH, Note: OCTAVE_HOME.
-- : matlabroot ()
Return the name of the top-level Octave installation directory.
This is an alias for the function ‘OCTAVE_HOME’ provided for
compatibility.
See also: Note: OCTAVE_HOME.
-- : OCTAVE_VERSION ()
Return the version number of Octave as a string.
See also: Note: ver, Note: version.
-- : V = version ()
-- : [V, D] = version ()
-- : V = version (FEATURE)
Get version information for Octave.
If called without input argument, the first return value V gives
the version number of Octave as a string. The second return value
D holds the release date as a string.
The following options can be passed for FEATURE:
"-date"
for the release date of the running build,
"-description"
for a description of the release (always an empty string),
"-release"
for the name of the running build (always an empty string),
"-java"
for version information of the Java VM,
"-fftw"
for version information for the linked FFTW,
"-blas"
for version information for the linked BLAS,
"-lapack"
for version information for the linked LAPACK.
"-hgid"
the mercurial ID of the sources used to build Octave.
The variant with no input and output argument is an alias for the
function ‘OCTAVE_VERSION’ provided for compatibility.
See also: Note: OCTAVE_VERSION, *note ver:
XREFver.
-- : ver
-- : ver Octave
-- : ver PACKAGE
-- : v = ver (...)
Display a header containing the current Octave version number,
license string, and operating system. The header is followed by a
list of installed packages, versions, and installation directories.
Use the package name PACKAGE or Octave to limit the listing to a
desired component.
When called with an output argument, return a vector of structures
describing Octave and each installed package. The structure
includes the following fields.
‘Name’
Package name.
‘Version’
Version of the package.
‘Release’
Release of the package.
‘Date’
Date of the version/release.
See also: Note: version, Note: usejava,
Note: pkg.
-- : compare_versions (V1, V2, OPERATOR)
Compare two version strings using the given OPERATOR.
This function assumes that versions V1 and V2 are arbitrarily long
strings made of numeric and period characters possibly followed by
an arbitrary string (e.g., "1.2.3", "0.3", "0.1.2+", or
"1.2.3.4-test1").
The version is first split into numeric and character portions and
then the parts are padded to be the same length (i.e., "1.1" would
be padded to be "1.1.0" when being compared with "1.1.1", and
separately, the character parts of the strings are padded with
nulls).
The operator can be any logical operator from the set
• "==" equal
• "<" less than
• "<=" less than or equal to
• ">" greater than
• ">=" greater than or equal to
• "!=" not equal
• "~=" not equal
Note that version "1.1-test2" will compare as greater than
"1.1-test10". Also, since the numeric part is compared first, "a"
compares less than "1a" because the second string starts with a
numeric part even though ‘double ("a")’ is greater than ‘double
("1").’
-- : license
-- : license inuse
-- : license inuse FEATURE
-- : license ("inuse")
-- : RETVAL = license ("inuse")
-- : RETVAL = license ("test", FEATURE)
-- : RETVAL = license ("checkout", FEATURE)
-- : [RETVAL, ERRMSG] = license ("checkout", FEATURE)
Get license information for Octave and Octave packages.
GNU Octave is free software distributed under the GNU General
Public License (GPL), and a license manager makes no sense. This
function is provided only for MATLAB compatibility.
When called with no extra input arguments, it returns the Octave
license, otherwise the first input defines the operation mode and
must be one of the following strings: ‘inuse’, ‘test’, and
‘checkout’. The optional FEATURE argument can either be "octave"
(core), or an Octave package.
"inuse"
Returns a list of loaded features, i.e., octave and the list
of loaded packages. If an output is requested, it returns a
struct array with the fields "feature", and "user".
"test"
Return true if the specified FEATURE is installed, false
otherwise.
An optional third argument "enable" or "disable" is accepted
but ignored.
"checkout"
Return true if the specified FEATURE is installed, false
otherwise. An optional second output will have an error
message if a package is not installed.
See also: Note: pkg, Note: ver, *note version:
XREFversion.
-- : getrusage ()
Return a structure containing a number of statistics about the
current Octave process.
Not all fields are available on all systems. If it is not possible
to get CPU time statistics, the CPU time slots are set to zero.
Other missing data are replaced by NaN. The list of possible
fields is:
‘idrss’
Unshared data size.
‘inblock’
Number of block input operations.
‘isrss’
Unshared stack size.
‘ixrss’
Shared memory size.
‘majflt’
Number of major page faults.
‘maxrss’
Maximum data size.
‘minflt’
Number of minor page faults.
‘msgrcv’
Number of messages received.
‘msgsnd’
Number of messages sent.
‘nivcsw’
Number of involuntary context switches.
‘nsignals’
Number of signals received.
‘nswap’
Number of swaps.
‘nvcsw’
Number of voluntary context switches.
‘oublock’
Number of block output operations.
‘stime’
A structure containing the system CPU time used. The
structure has the elements ‘sec’ (seconds) ‘usec’
(microseconds).
‘utime’
A structure containing the user CPU time used. The structure
has the elements ‘sec’ (seconds) ‘usec’ (microseconds).
-- : VALUE = winqueryreg (ROOTKEY, SUBKEY, VALUENAME)
-- : VALUE = winqueryreg (ROOTKEY, SUBKEY)
-- : NAMES = winqueryreg (‘"name"’, ROOTKEY, SUBKEY)
Query names or value from the Windows registry.
On Windows, return the value of the registry key SUBKEY from the
root key ROOTKEY. You can specify the name of the queried registry
value with the optional argument VALUENAME. Otherwise, if called
with only two arguments or VALUENAME is empty, then the default
value of SUBKEY is returned. If the registry value is of type
"REG_DWORD" then VALUE is of class int32. If the value is of the
type "REG_SZ" or "REG_EXPAND_SZ" a string is returned.
If the first argument is "name", a cell array of strings with the
names of the values at that key is returned.
The variable ROOTKEY must be a string with a valid root key
identifier:
HKCR
HKEY_CLASSES_ROOT
HKEY_CURRENT_CONFIG
HKCU
HKEY_CURRENT_USER
HKLM
HKEY_LOCAL_MACHINE
HKU
HKEY_USERS
HKEY_PERFORMANCE_DATA
Examples:
Get a list of value names at the key ’HKCU\Environment’:
VALUENAMES = winqueryreg ("name", "HKEY_CURRENT_USER", ...
"Environment");
For each VALUENAMES, display the value:
for K = 1:numel (VALUENAMES)
VAL = winqueryreg ("HKEY_CURRENT_USER", "Environment", ...
VALUENAMES{K});
STR = sprintf ("%s = %s", VALUENAMES{K}, num2str (VAL));
disp (STR);
endfor
On non-Windows platforms this function fails with an error.
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