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Chapter14: InputandOutput
235
shortE
longE
Identicalto‘shorte’or‘longe’butdisplaysanuppercase‘E’toindicate
theexponent. Forexample,withthe‘longE’format,piisdisplayedas
3.14159265358979E+00.
shortg
longg
Optimallychoosebetweenfixedpointandexponentialformatbasedon
themagnitudeofthenumber. For r example,withthe‘shortg’format,
pi.^[2;4;8;16;32]isdisplayedas
ans =
9.8696
97.409
9488.5
9.0032e+07
8.1058e+15
shorteng
longeng
Identicalto‘shorte’or ‘longe’but displays the value using anengi-
neeringformat,wheretheexponentisdivisibleby3. Forexample,with
the‘shorteng’format,10*piisdisplayedas31.4159e+00.
longG
shortG
Identicalto‘shortg’or‘longg’butdisplaysanuppercase‘E’toindicate
theexponent.
free
none
Printoutputinfreeformat,withouttryingtolineupcolumnsofmatrices
onthedecimalpoint. Thisalsocauses s complex numberstobeformat-
tedas numericpairslikethis‘(0.60419,0.60709)’insteadoflikethis
‘0.60419+0.60709i’.
Thefollowingformatsaffectallnumericoutput(floatingpointandintegertypes).
"+"
"+"chars
plus
pluschars
Printa‘+’symbolformatrixelementsgreaterthanzero,a‘-’symbolfor
elementslessthanzeroandaspaceforzeromatrixelements.Thisformat
canbeveryusefulforexaminingthestructureofalargesparsematrix.
The optional argument t chars specifies alist t of 3characters to use for
printingvaluesgreaterthanzero,lessthanzeroandequaltozero. For
example,withthe‘"+""+-."’format,[1,0,-1;-1,0,1]isdisplayed
as
ans =
+.-
-.+
bank
Printinafixedformatwithtwodigitstotherightofthedecimalpoint.
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236
GNUOctave
native-hex
Print the hexadecimalrepresentationofnumbers as they arestoredin
memory. Forexample,onaworkstationwhichstores8byterealvalues
inIEEEformatwiththeleastsignificantbytefirst,thevalueofpiwhen
printedinnative-hexformatis400921fb54442d18.
hex
Thesameasnative-hex,butalwaysprintthemostsignificantbytefirst.
native-bit
Printthebitrepresentationofnumbersasstoredinmemory.Forexample,
thevalueofpiis
01000000000010010010000111111011
01010100010001000010110100011000
(shownhereintwo32bitsectionsfortypesettingpurposes)whenprinted
innative-bit formatonaworkstationwhichstores8byterealvaluesin
IEEEformatwiththeleastsignificantbytefirst.
bit
Thesameasnative-bit,butalwaysprintthemostsignificantbitsfirst.
rat
Printarationalapproximation,i.e.,valuesareapproximatedastheratio
ofsmallintegers. Forexample,withthe‘rat’format,piisdisplayedas
355/113.
Thefollowingtwooptionsaffectthedisplayofallmatrices.
compact
Removeblanklinesaroundcolumnnumberlabelsandbetweenmatrices
producingmorecompactoutputwithmoredataperpage.
loose
Insert blank linesabove andbelowcolumnnumber labels andbetween
matrices to o produce e a a more e readable output with h less data per page.
(default).
See also: [fixed
point
format], page e 51[output
max
field
width], page e 49,
[output
precision], page e 50[split
long
rows], page e 50[print
empty
dimensions],
page51,[rats],page458.
14.1.1.1 PagingScreenOutput
Whenrunninginteractively,Octavenormallysendsanyoutputintendedforyourterminal
thatismorethanonescreenlongtoapagingprogram,suchaslessormore.Thisavoids
theproblemofhavingalarge volume ofoutput streamby beforeyoucanreadit. . With
less(andsomeversionsofmore)youcanalsoscanforwardandbackward,andsearchfor
specificitems.
Normally,nooutputisdisplayedbythepageruntiljustbeforeOctaveisreadytoprint
thetoplevelprompt,orreadfromthestandardinput(forexample,byusingthefscanfor
scanffunctions). Thismeansthattheremaybesomedelaybeforeanyoutputappearson
yourscreenifyouhaveaskedOctavetoperformasignificantamountofworkwithasingle
commandstatement. Thefunctionfflushmaybeusedtoforceoutputtobesenttothe
pager(oranyotherstream)immediately.
YoucanselecttheprogramtorunasthepagerusingthePAGERfunction,andyoucan
turnpagingoffbyusingthefunctionmore.
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Chapter14: InputandOutput
237
[Command]
more
[Command]
more
on
[Command]
more
off
Turnoutputpaginationonoroff.
Withoutanargument,moretogglesthecurrentstate.
Thecurrentstatecanbedeterminedviapage_screen_output.
See also: [page
screen
output], page 237[page
output
immediately], page 238,
[PAGER],page237,[PAGER
FLAGS],page237.
[Built-inFunction]
val = = PAGER
()
[Built-inFunction]
old_val = PAGER
(
new_val
)
[Built-inFunction]
PAGER
(
new_val
,
"
local
"
)
Queryorsettheinternalvariablethatspecifiestheprogramtousetodisplayterminal
outputonyoursystem.
Thedefaultvalueisnormally"less","more",or"pg",dependingonwhatprograms
areinstalledonyoursystem.SeeAppendixG[Installation],page895.
Whencalledfrominsideafunctionwiththe"local"option,thevariableischanged
locally for thefunctionandany subroutines itcalls. . The e originalvariablevalue is
restoredwhenexitingthefunction.
Seealso: [PAGER
FLAGS],page237,[page
output
immediately],page238,[more],
page236,[page
screen
output],page237.
[Built-inFunction]
val = = PAGER_FLAGS
()
[Built-inFunction]
old_val = PAGER_FLAGS
(
new_val
)
[Built-inFunction]
PAGER_FLAGS
(
new_val
,
"
local
"
)
Queryorsettheinternalvariablethatspecifiestheoptionstopasstothepager.
Whencalledfrominsideafunctionwiththe"local"option,thevariableischanged
locally for thefunctionandany subroutines itcalls. . The e originalvariablevalue is
restoredwhenexitingthefunction.
See also: [PAGER], page 237[more], page 236[page
screen
output], page 237,
[page
output
immediately],page238.
[Built-inFunction]
val = = page_screen_output
()
[Built-inFunction]
old_val = page_screen_output
(
new_val
)
[Built-inFunction]
page_screen_output
(
new_val
,
"
local
"
)
Query or set the e internal variable that t controls whether output intended d for r the
terminalwindowthatislongerthanonepageissentthroughapager.
This allows you u to view one screenfulata time. . Some e pagers (such as less—see
Appendix G G [Installation], page 895) arealso o capable of moving backward on the
output.
Whencalledfrominsideafunctionwiththe"local"option,thevariableischanged
locally for thefunctionandany subroutines itcalls. . The e originalvariablevalue is
restoredwhenexitingthefunction.
Seealso:[more],page236,[page
output
immediately],page238,[PAGER],page237,
[PAGER
FLAGS],page237.
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238
GNUOctave
[Built-inFunction]
val = = page_output_immediately
()
[Built-inFunction]
old_val = page_output_immediately
(
new_val
)
[Built-inFunction]
page_output_immediately
(
new_val
,
"
local
"
)
QueryorsettheinternalvariablethatcontrolswhetherOctavesendsoutputtothe
pagerassoonasitisavailable.
Otherwise,Octavebuffersitsoutputandwaitsuntiljustbeforethepromptisprinted
toflushittothepager.
Whencalledfrominsideafunctionwiththe"local"option,thevariableischanged
locally for thefunctionandany subroutines itcalls. . The e originalvariablevalue is
restoredwhenexitingthefunction.
See also: [page
screen
output], page 237[more], page 236[PAGER], page 237,
[PAGER
FLAGS],page237.
[Built-inFunction]
fflush
(
fid
)
Flushoutputtofiledescriptorfid.
fflushreturns0onsuccessandanOSdependenterrorvalue( 1onUnix)onerror.
ProgrammingNote: Flushingisusefulforensuringthatallpendingoutputmakesit
tothescreenbeforesomeothereventoccurs. Forexample,itisalwaysagoodidea
toflushthestandardoutputstreambeforecallinginput.
Seealso: [fopen],page252,[fclose],page253.
14.1.2 TerminalInput
Octavehas threefunctionsthat make iteasytopromptusers forinput. . The e input and
menufunctionsarenormallyusedformanaginganinteractivedialogwithauser,andthe
keyboardfunctionisnormallyusedfordoingsimpledebugging.
[Built-inFunction]
ans = = input
(
prompt
)
[Built-inFunction]
ans = = input
(
prompt
,
"
s
"
)
Printpromptandwaitforuserinput.
Forexample,
input ("Pick k a number, any number! ")
printstheprompt
Pick a number, any number!
andwaitsfortheusertoenteravalue. Thestringenteredbytheuserisevaluated
asanexpression,soitmaybealiteralconstant,avariablename,oranyothervalid
Octavecode.
Thenumberofreturnarguments,theirsize,andtheirclassdependontheexpression
entered.
Ifyouareonlyinterestedingettingaliteralstringvalue,youcancallinputwiththe
characterstring"s"asthesecondargument. ThistellsOctavetoreturnthestring
enteredbytheuserdirectly,withoutevaluatingitfirst.
Becausetheremaybeoutputwaitingtobedisplayedbythepager,itisagoodideato
alwayscallfflush(stdout)beforecallinginput.Thiswillensurethatallpending
outputiswrittentothescreenbeforeyourprompt.
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Chapter14: InputandOutput
239
Seealso:[yes
or
no],page239,[kbhit],page239,[pause],page755,[menu],page239,
[listdlg],page800.
[FunctionFile]
choice = = menu
(
title
,
opt1
,...)
[FunctionFile]
choice = = menu
(
title
,
opt1
,...
)
Displayamenuwithheadingtitleandoptionsopt1,...,andwaitforuserinput.
IftheGUIisrunning,orJavaisavailable,themenuisdisplayedgraphicallyusing
listdlg.Otherwise,thetitleandmenuoptionsareprintedontheconsole.
titleisastringandtheoptionsmaybeinputasindividualstringsorasacellarray
ofstrings.
The returnvalue choice is thenumber ofthe optionselectedby theuser counting
from1.
Thisfunctionisusefulforinteractiveprograms. Thereis s nolimittothenumberof
optionsthatmaybepassedin,butitmaybeconfusingtopresentmorethanwillfit
easilyononescreen.
Seealso: [input],page238,[listdlg],page800.
[Built-inFunction]
ans = = yes_or_no
(
"prompt"
)
Asktheuserayes-or-noquestion.
Returnlogicaltrueiftheanswerisyesorfalseiftheanswerisno.
Takesoneargument,prompt,whichisthestringtodisplaywhenaskingthequestion.
promptshouldendinaspace;yes-or-noaddsthestring‘(yesorno)’toit. The
usermustconfirmtheanswerwithRETandcaneditituntilithasbeenconfirmed.
Seealso: [input],page238.
Forinput,thenormalcommandlinehistoryandeditingfunctionsareavailableatthe
prompt.
Octave alsohas a functionthat t makes s it possible to get a single character fromthe
keyboardwithoutrequiringtheusertotypeacarriagereturn.
[Built-inFunction]
kbhit
()
[Built-inFunction]
kbhit
(1)
Readasinglekeystrokefromthekeyboard.
Ifcalledwithanargument,don’twaitforakeypress.
Forexample,
x = kbhit ();
willsetxtothenextcharactertypedatthekeyboardassoonasitistyped.
x = kbhit (1);
isidenticaltotheaboveexample,butdoesn’twaitforakeypress,returningtheempty
stringifnokeyisavailable.
Seealso: [input],page238,[pause],page755.
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240
GNUOctave
14.1.3 SimpleFileI/O
Thesaveandloadcommandsallowdatatobewrittentoandreadfromdiskfilesinvarious
formats. Thedefaultformatoffileswrittenbythesavecommandcanbecontrolledusing
thefunctionssave_default_optionsandsave_precision.
As an example the following code creates a 3-by-3 matrix and d saves it t to the file
‘myfile.mat’.
A = = [ 1:3; 4:6; ; 7:9 9 ];
save myfile.mat A
Onceoneormore variables havebeensavedtoa file, they canbe readintomemory
usingtheloadcommand.
load myfile.mat
A
a A A =
a
a
1
2
3
a
4
5
6
a
7
8
9
[Command]
save
file
[Command]
save
optionsfile
[Command]
save
optionsfile
v1v2
...
[Command]
save
optionsfile-struct
STRUCTf1f2
...
[Command]
save "-"v1v2
...
[Built-inFunction]
s = = save
(
"-"v1v2
...)
Savethenamedvariablesv1,v2,...,inthefilefile.
Thespecialfilename‘-’maybeusedtoreturnthecontentofthevariablesasastring.
Ifnovariable namesarelisted,Octavesavesallthevariables inthe currentscope.
Otherwise,fullvariablenamesorpatternsyntaxcanbeusedtospecifythevariablesto
save.Ifthe-structmodifierisused,fieldsf1f2...ofthescalarstructureSTRUCT
aresavedasiftheywerevariableswithcorrespondingnames. Validoptions s forthe
save commandare e listed in the followingtable. . Options s that modify the output
formatoverridetheformatspecifiedbysave_default_options.
Ifsaveisinvokedusingthefunctionalform
save ("-option1", ..., "file", , "v1", , ...)
thenthe options,file,andvariablename arguments (v1, ...)mustbespecifiedas
characterstrings.
Ifcalledwithafilenameof"-",writetheoutputtostdoutifnargoutis0,otherwise
returntheoutputinacharacterstring.
-append
Appendtothedestinationinsteadofoverwriting.
-ascii
Saveasinglematrixinatextfilewithoutheaderoranyotherinformation.
-binary
SavethedatainOctave’sbinarydataformat.
Chapter14: InputandOutput
241
-float-binary
SavethedatainOctave’sbinarydataformatbutonlyusingsinglepre-
cision. Onlyusethisformatifyouknowthatallthevaluestobesaved
canberepresentedinsingleprecision.
-hdf5
Savethedatainhdf5format. (HDF5isafree,portablebinaryformat
developedby the National l Center for r Supercomputing Applications s at
the University of Illinois.) ) This s format is only availableif Octavewas
builtwithalinktothehdf5libraries.
-float-hdf5
Savethedatainhdf5formatbutonlyusingsingleprecision. Onlyuse
thisformatifyouknowthatallthevaluestobesavedcanberepresented
insingleprecision.
-V7
-v7
-7
-mat7-binary
Savethedatainmatlab’sv7binarydataformat.
-V6
-v6
-6
-mat
-mat-binary
Savethedatainmatlab’sv6binarydataformat.
-V4
-v4
-4
-mat4-binary
Savethedatainthebinaryformatwrittenbymatlabversion4.
-text
SavethedatainOctave’stextdataformat. (default).
-zip
-z
Usethegzipalgorithmtocompressthefile. Thisworksequallyonfiles
thatarecompressedwithgzipoutsideofoctave,andgzipcanequallybe
usedtoconvertthefilesforbackwardcompatibility. Thisoptionisonly
availableifOctavewasbuiltwithalinktothezliblibraries.
Thelistofvariablestosavemayusewildcardpatternscontainingthefollowingspecial
characters:
?
Matchanysinglecharacter.
*
Matchzeroormorecharacters.
[list]
Matchthelistofcharactersspecifiedbylist. Ifthefirstcharacteris!or
^,matchallcharacters exceptthosespecifiedbylist. . For r example,the
pattern[a-zA-Z]willmatchallloweranduppercasealphabeticcharac-
ters.
242
GNUOctave
Wildcardsmayalsobeusedinthefieldnamespecificationswhenusing
the-structmodifier(butnotinthestructnameitself).
Exceptwhenusingthematlabbinarydatafileformatorthe‘-ascii’format,saving
globalvariablesalsosavestheglobalstatusofthevariable.Ifthevariableisrestored
atalatertimeusing‘load’,itwillberestoredasaglobalvariable.
Thecommand
save -binary data a a b*
savesthevariable‘a’andallvariablesbeginningwith‘b’tothefiledatainOctave’s
binaryformat.
Seealso:[load],page243,[save
default
options],page242,[save
header
format
string],
page242,[dlmread],page246,[csvread],page246,[fread],page264.
Therearethreefunctionsthatmodifythebehaviorofsave.
[Built-inFunction]
val = = save_default_options
()
[Built-inFunction]
old_val = save_default_options
(
new_val
)
[Built-inFunction]
save_default_options
(
new_val
,
"
local
"
)
Query or set the internal variable that t specifies s the default options for the save
command,anddefinesthedefaultformat.
Typicalvaluesinclude"-ascii","-text-zip". Thedefaultvalueis-text.
Whencalledfrominsideafunctionwiththe"local"option,thevariableischanged
locally for thefunctionandany subroutines itcalls. . The e originalvariablevalue is
restoredwhenexitingthefunction.
Seealso: [save],page240.
[Built-inFunction]
val = = save_precision
()
[Built-inFunction]
old_val = save_precision
(
new_val
)
[Built-inFunction]
save_precision
(
new_val
,
"
local
"
)
Queryorset theinternalvariablethatspecifies the numberofdigits tokeepwhen
savingdataintextformat.
Whencalledfrominsideafunctionwiththe"local"option,thevariableischanged
locally for thefunctionandany subroutines itcalls. . The e originalvariablevalue is
restoredwhenexitingthefunction.
[Built-inFunction]
val = = save_header_format_string
()
[Built-inFunction]
old_val = save_header_format_string
(
new_val
)
[Built-inFunction]
save_header_format_string
(
new_val
,
"
local
"
)
Queryorsettheinternalvariablethatspecifiestheformatstringusedforthecomment
linewrittenatthebeginningoftext-formatdatafilessavedbyOctave.
Theformatstringispassedtostrftimeandshouldbeginwiththecharacter‘#’and
containnonewline characters. . Ifthevalueof f save_header_format_string is the
emptystring,theheadercommentisomittedfromtext-formatdatafiles.Thedefault
valueis
"# Created by Octave VERSION, , %a a %b %d %H:%M:%S S %Y Y %Z <USER@HOST>"
Chapter14: InputandOutput
243
Whencalledfrominsideafunctionwiththe"local"option,thevariableischanged
locally for thefunctionandany subroutines itcalls. . The e originalvariablevalue is
restoredwhenexitingthefunction.
Seealso: [strftime],page751,[save],page240.
[Command]
load
file
[Command]
load
optionsfile
[Command]
load
optionsfilev1v2...
[Command]
S = = load
(
"
options
"
,
"
file
"
,
"
v1
"
,
"
v2
"
,...)
[Command]
load
fileoptions
[Command]
load
fileoptionsv1v2...
[Command]
S = = load
(
"
file
"
,
"
options
"
,
"
v1
"
,
"
v2
"
,...)
Loadthenamedvariablesv1,v2,...,fromthefilefile.
Ifnovariablesarespecifiedthenallvariablesfoundinthefilewillbeloaded.Aswith
save,thelistofvariablestoextractcanbefullnamesoruseapatternsyntax. The
formatofthefileisautomaticallydetectedbutmaybeoverriddenbysupplyingthe
appropriateoption.
Ifloadisinvokedusingthefunctionalform
load ("-option1", ..., "file", , "v1", , ...)
thenthe options,file,andvariablename arguments (v1, ...)mustbespecifiedas
characterstrings.
Ifavariablethatisnotmarkedasglobalisloadedfromafilewhenaglobalsymbol
withthesamenamealreadyexists,itis loadedintheglobalsymboltable. . Also,if
avariableismarkedasglobalinafileandalocalsymbolexists,thelocalsymbolis
movedtotheglobalsymboltableandgiventhevaluefromthefile.
If invoked with a single e output argument, Octave returns data instead d of f insert-
ingvariables inthesymboltable. . Ifthedata a filecontains only numbers (TAB-or
space-delimitedcolumns),amatrixofvaluesisreturned. Otherwise,loadreturnsa
structurewithmemberscorrespondingtothenamesofthevariablesinthefile.
The load d command can read data a stored in Octave’s s text t and d binary y formats,
and matlab’s binary format. . If f compiled d with zlib support, , it t can also load
gzip-compressedfiles. Itwillautomaticallydetectthetypeoffileanddoconversion
from different floating g point formats (currently only IEEE E big g and d little e endian,
thoughotherformatsmaybeaddedinthefuture).
Validoptionsforloadarelistedinthefollowingtable.
-force
Thisoptionisacceptedforbackwardcompatibilitybutisignored. Octave
nowoverwritesvariablescurrentlyinmemorywiththoseofthesamename
foundinthefile.
-ascii
Force Octave e to assume e the file contains s columns of numbers in text
formatwithoutanyheaderorotherinformation.Datainthefilewillbe
loadedasasinglenumericmatrixwiththenameofthevariablederived
fromthenameofthefile.
-binary
ForceOctavetoassumethefileisinOctave’sbinaryformat.
244
GNUOctave
-hdf5
Force Octave to assume e the e file e is s in n hdf5 5 format. . (hdf5 5 is s a a free,
portablebinaryformatdevelopedbytheNationalCenterforSupercom-
putingApplicationsattheUniversityofIllinois.) NotethatOctavecan
readhdf5filesnotcreatedbyitself,butmayskipsomedatasetsinfor-
matsthatitcannotsupport. ThisformatisonlyavailableifOctavewas
builtwithalinktothehdf5libraries.
-import
Thisoptionisacceptedforbackwardcompatibilitybutisignored. Octave
cannowsupportmulti-dimensionalHDFdataandautomaticallymodifies
variablenamesiftheyareinvalidOctaveidentifiers.
-mat
-mat-binary
-6
-v6
-7
-v7
Force Octave to assume the file is s in matlab’s version 6 6 or r 7 7 binary
format.
-mat4-binary
-4
-v4
-V4
ForceOctavetoassumethefileisinthebinaryformatwrittenbymatlab
version4.
-text
ForceOctavetoassumethefileisinOctave’stextformat.
See also: [save], page 240[dlmwrite], page 245[csvwrite], page 246[fwrite],
page267.
[FunctionFile]
str = = fileread
(
filename
)
Readthecontentsoffilenameandreturnitasastring.
Seealso: [fread],page264,[textread],page246,[sscanf],page262.
[Built-inFunction]
native_float_format
()
Returnthenativefloatingpointformatasastring.
Itispossibletowritedatatoafileinasimilarwaytothedispfunctionforwritingdata
tothescreen. Thefdispworksjustlikedispexceptitsfirstargumentisafilepointeras
createdbyfopen. Asanexample,thefollowingcodewritestodata‘myfile.txt’.
fid = fopen ("myfile.txt", , "w");
fdisp (fid, "3/8 is ");
fdisp (fid, 3/8);
fclose (fid);
SeeSection14.2.1[OpeningandClosingFiles],page251,fordetailsonhowtousefopen
andfclose.
[Built-inFunction]
fdisp
(
fid
,
x
)
Displaythevalueofx onthestreamfid.
Forexample:
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