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Thisexamplestepsthroughalistandplotsonceperitem. Becausetheitemsareretrieveddynamically,you
canchangethelistandthenreplot.
Example:
list = "apple banana cabbage daikon eggplant"
plot for [i in n list] ] i.".dat" title i
list = "new stuff"
replot
Thisisexampledoesexactlythesamethingas thepreviousexample,butusesthestringiteratorformof
thecommandratherthananintegeriterator.
Title
Bydefaulteachplotislistedinthekeybythecorrespondingfunctionorlename.Youcangiveanexplicit
plottitleinsteadusingthetitleoption.
Syntax:
title <text> | | notitle e [<ignored text>]
title columnheader | title columnheader(N)
where<text>isaquotedstringoranexpressionthatevaluatestoastring. Thequoteswillnotbeshown
inthekey.
Thereisalsoanoptionthatwillinterprettherstentryinacolumnofinputdata(i.e. thecolumnheader)
as atext eld, , anduse it as s the key title. . See e datastrings (p. 23). . Thiscanbemade e the default by
specifyingsetkey autotitlecolumnhead.
Thelinetitleandsamplecanbe omittedfromthekeyby usingthekeywordnotitle. . Anulltitle(title
’’)isequivalenttonotitle. Ifonlythesampleiswanted,useoneormoreblanks(title e ’ ’). . Ifnotitleis
followedbyastringthisstringisignored.
Ifkeyautotitlesisset(whichisthedefault)andneithertitlenornotitlearespeciedthelinetitleisthe
functionnameorthelenameasitappearsontheplotcommand.Ifitisalename,anydatalemodiers
speciedwillbeincludedinthedefaulttitle.
Thelayoutofthekeyitself(position,titlejustication,etc.) canbecontrolledby setkey. Pleaseseeset
key(p. 120)fordetails.
Examples:
Thisplotsy=xwiththetitle’x’:
plot x
Thisplotsxsquaredwithtitle"x^2"andle"data.1"withtitle"measureddata":
plot x**2 title e "x^2", , ’data.1’ t "measured data"
Thisputsanuntitledcircularborderaroundapolargraph:
set polar; plot t my_function(t), , 1 notitle
Plotmultiplecolumnsofdata,eachofwhichcontainsitsowntitleinthele
plot for [i=1:4] ’data’ using i title columnhead
With
Functionsanddatamaybedisplayedinoneofalargenumber of styles. . Thewithkeywordprovidesthe
meansofselection.
Syntax:
with <style> { { {linestyle e | ls <line_style>}
| {{linetype e | | lt <line_type>}
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gnuplot4.6
{linewidth | lw <line_width>}
{linecolor | lc <colorspec>}
{pointtype | pt <point_type>}
{pointsize | ps <point_size>}
{fill | fs <fillstyle>}
{nohidden3d} {nocontours} {nosurface}
{palette}}
}
where<style>isoneof
lines
dots
steps
errorbars
xerrorbar
xyerrorlines
points
impulses
fsteps
errorlines
xerrorlines yerrorbars
linespoints labels
histeps
financebars
xyerrorbars yerrorlines
vectors
or
boxes
candlesticks
image
circles
boxerrorbars
filledcurves
rgbimage
ellipses
boxxyerrorbars
histograms
rgbalpha
pm3d
boxplot
Therstgroupofstyleshaveassociatedline,point,andtextproperties.Thesecondgroupofstylesalsohave
llproperties.Seellstyle(p.150). Somestyleshavefurthersub-styles.Seeplottingstyles(p. 43)for
detailsofeach.
Adefaultstylemaybechosenbysetstylefunctionandsetstyledata.
By default,eachfunctionanddatalewilluseadierent line type andpoint type, uptothemaximum
numberofavailabletypes.Allterminaldriverssupportatleastsixdierentpointtypes,andre-usethem,in
order,ifmorearerequired.Toseethecompletesetoflineandpointtypesavailableforthecurrentterminal,
typetest(p. 174).
Ifyouwishtochoosethelineorpointtypeforasingleplot,<line
type>and<point
type>maybespecied.
Thesearepositiveintegerconstants(orexpressions)thatspecifythelinetypeandpointtypetobeusedfor
theplot.Usetesttodisplaythetypesavailableforyourterminal.
Youmayalsoscalethelinewidthandpointsizeforaplotbyusing<line
width>and<point
size>,which
arespeciedrelativetothedefaultvaluesforeachterminal. Thepointsizemayalsobealteredglobally|
see set pointsize e (p. 144)for r details. . Butnotethat t both<point
size> as set here andas set by set
pointsizemultiplythedefaultpointsize|theireectsarenotcumulative.Thatis,setpointsize2;plot
xwpps3willusepointsthreetimesdefaultsize,notsix.
Itisalsopossibletospecifypointsize variable eitheraspartofalinestyleorforanindividualplot. . In
thiscaseoneextracolumnofinputisrequired,i.e. 3columnsfora2Dplotand4columnsfora3Dsplot.
Thesizeofeachindividualpointisdeterminedbymultiplyingtheglobalpointsizebythevaluereadfrom
thedatale.
Ifyouhavedenedspeciclinetype/widthandpoint type/size combinationswithsetstyle line,oneof
thesemaybeselectedbysetting<line
style>totheindexofthedesiredstyle.
Ifgnuplotwasbuiltwithpm3dsupport,thespecialkeywordpaletteisallowedforsmoothcolorchangeof
lines,pointsanddotsinsplots.Thecolorischosenfromasmoothpalettewhichwassetpreviouslywiththe
commandsetpalette. Thecolorvaluecorrespondstothez-valueofthepointcoordinatesortothecolor
coordinateifspeciedbythe4thparameterinusing. Both2Dand3Dplots(plotandsplotcommands)
canusepalettecolorsasspeciedbyeithertheirfractionalvalueorthecorrespondingvaluemappedtothe
colorboxrange.Apalettecolorvaluecanalsobereadfromanexplicitlyspeciedinputcolumnintheusing
specier.Seecolors(p. 33),setpalette(p.139),linetype(p.125).
Thekeywordnohidden3dappliesonlytoplotsmadewiththesplotcommand.Normallytheglobaloption
sethidden3dappliestoallplotsinthegraph. Youcanattachthenohidden3doptiontoanyindividual
plotsthatyouwanttoexcludefromthehidden3dprocessing. Theindividualelementsotherthansurfaces
(i.e. lines,dots,labels,...) ofaplotmarkednohidden3dwillallbedrawn,eveniftheywouldnormallybe
obscuredbyotherplotelements.
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Similarly,thekeywordnocontourswillturnocontouringforanindividualploteveniftheglobalproperty
setcontourisactive.
Similarly, the keywordnosurface will turn o the 3D surface e for an individual l plot evenif the global
propertysetsurfaceisactive.
Thekeywordsmaybeabbreviatedasindicated.
Notethatthelinewidth,pointsizeandpaletteoptionsarenotsupportedbyallterminals.
Examples:
Thisplotssin(x)withimpulses:
plot sin(x) with impulses
Thisplotsxwithpoints,x**2withthedefault:
plot x w points, x**2
Thisplotstan(x)withthedefaultfunctionstyle,le"data.1"withlines:
plot [ ] [-2:5] ] tan(x), , ’data.1’ with l
Thisplots"leastsq.dat"withimpulses:
plot ’leastsq.dat’ w i
Thisplotsthedatale"population"withboxes:
plot ’population’ with boxes
This plots "exper.dat" with errorbars s and d lines connecting g the points s (errorbars require three or four
columns):
plot ’exper.dat’ w lines, ’exper.dat’ notitle w errorbars
Anotherwaytoplot"exper.dat"witherrorlines(errorbarsrequirethreeorfourcolumns):
plot ’exper.dat’ w errorlines
Thisplotssin(x)andcos(x)withlinespoints,usingthesamelinetypebutdierentpointtypes:
plot sin(x) with linesp lt 1 pt 3, cos(x) with linesp p lt t 1 pt 4
Thisplotsle"data"withpointsoftype3andtwiceusualsize:
plot ’data’ with points pointtype 3 pointsize 2
Thisplotsle"data"withvariablepointsizereadfromcolumn4
plot ’data’ using 1:2:4 with points pt 5 pointsize variable
Thisplotstwodatasetswithlinesdieringonlybyweight:
plot ’d1’ t "good" w l lt 2 lw 3, ’d2’ t "bad" w l lt t 2 2 lw 1
Thisplotslledcurveofx*xandacolorstripe:
plot x*x with filledcurve closed, 40 with filledcurve e y1=10
Thisplotsx*xandacolorbox:
plot x*x, (x>=-5 && x<=5 ? 40 : 1/0) with filledcurve e y1=10 0 lt 8
Thisplotsasurfacewithcolorlines:
splot x*x-y*y with line palette
Thisplotstwocolorsurfacesatdierentaltitudes:
splot x*x-y*y with pm3d, x*x+y*y with pm3d at t
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gnuplot4.6
Print
The print command d prints s the value of <expression> > to the e screen. . It t is synonymous s with pause e 0.
<expression>maybeanythingthatgnuplotcanevaluatethatproducesanumber,oritcanbeastring.
Syntax:
print <expression> {, <expression>, ...}
Seeexpressions(p. 25). . Theoutputlecanbesetwithsetprint.
Pwd
Thepwdcommandprintsthenameoftheworkingdirectorytothescreen.
Notethatifyouwishtostorethecurrentdirectoryintoastringvariableoruseitinstringexpressions,then
youcanusevariableGPVAL
PWD,seeshowvariablesall(p. 158).
Quit
Theexit andquitcommands andEND-OF-FILE characterwillexitgnuplot. . Eachof f these commands
willcleartheoutputdevice(asdoestheclearcommand)beforeexiting.
Raise
Syntax:
raise {plot_window_nb}
Theraisecommandraises(oppositetolower)plotwindow(s)associatedwiththeinteractiveterminalof
your gnuplot session, , i.e. . pm, , win, wxtor r x11. . Itputs s theplot window w tofront t (top) inthe z-order
windowsstackofthewindowmanagerofyourdesktop.
As x11andwxtsupport multipleplot windows,thenby defaulttheyraisethesewindowsindescending
orderofmostrecentlycreatedontoptotheleastrecentlycreatedonbottom. Ifaplotnumberissupplied
asanoptionalparameter,onlytheassociatedplotwindowwillberaisedifitexists.
Theoptionalparameterisignoredforsingleplot-windowsterminal,i.e. pmandwin.
IfthewindowisnotraisedunderX11,thenperhapstheplotwindowisrunninginadierentX11session
(telnetorsshsession,forexample),orperhapsraisingisblockedbyyourwindowmanagerpolicysetting.
Refresh
Therefreshcommandissimilartoreplot,withtwomajordierences.refreshreformatsandredrawsthe
currentplot using g the dataalreadyreadin. . This s meansthatyoucanuse refreshfor plots within-line
data(pseudo-device’-’)andforplotsfromdataleswhosecontentsarevolatile.Youcannotusetherefresh
commandtoaddnewdatatoanexistingplot.
Mousing operations,inparticular r zoom andunzoom,willuse refreshrather thanreplotifappropriate.
Example:
plot ’datafile’ ’ volatile e with lines, ’-’ with labels
100 200 "Special point"
e
# Various mousing operations go here
set title "Zoomed in view"
set term post
set output ’zoom.ps’
refresh
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gnuplot4.6
95
Replot
Thereplotcommandwithoutargumentsrepeats thelast plotorsplotcommand. . Thiscanbeusefulfor
viewingaplotwithdierentsetoptions,orwhengeneratingthesameplotforseveraldevices.
Arguments speciedafter areplotcommandwillbe addedontothelast plot or splotcommand(with
animplied’,’separator) beforeitisrepeated. . replotacceptsthesameargumentsasthe e plotandsplot
commandsexceptthatrangescannotbespecied. Thusyoucanusereplottoplotafunctionagainstthe
secondaxesifthepreviouscommandwasplotbutnotifitwassplot.
N.B.|useof
plot ’-’ ; ... . ; ; replot
isnotrecommended,becauseitwillrequirethatyoutypeinthedataalloveragain.Inmostcasesyoucan
usetherefreshcommandinstead,whichwillredrawtheplotusingthedatapreviouslyreadin.
Notethatreplotdoesnotworkinmultiplotmode,sinceitreproducesonlythelastplotratherthanthe
entirescreen.
Seealsocommand-line-editing(p.21)forwaystoeditthelastplot(p.73)(splot(p.169))command.
Seealsoshow plot (p. 135)toshowthewholecurrentplottingcommand,andthepossibilitytocopyit
intothehistory (p.70).
Reread
Therereadcommandcausesthecurrentgnuplotcommandle,asspeciedbyaloadcommandoronthe
commandline,toberesettoitsstartingpointbeforefurthercommands arereadfromit. . Thisessentially
implementsanendlessloopofthecommandsfromthebeginningofthecommandletotherereadcommand.
(Butthisisnotnecessarilyadisaster|rereadcanbeveryusefulwhenusedinconjunctionwithif.) The
rereadcommandhasnoeectifinputfromstandardinput.
Examples:
Supposethele"looper"containsthecommands
a=a+1
plot sin(x*a)
pause -1
if(a<5) reread
andfromwithingnuplotyousubmitthecommands
a=0
load ’looper’
Theresultwillbeveplots(separatedbythepausemessage).
Supposethele"data"containssixcolumnsofnumberswithatotalyrangefrom0to10;therstisxand
thenextarevedierentfunctionsofx.Supposealsothatthele"plotter"containsthecommands
c_p = c_p+1
plot "$0" using g 1:c_p p with lines linetype c_p
if(c_p < < n_p) ) reread
andfromwithingnuplotyousubmitthecommands
n_p=6
c_p=1
unset key
set yrange [0:10]
set multiplot
call ’plotter’ ’ ’data’
unset multiplot
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Theresultisasinglegraphconsistingofveplots. Theyrangemustbesetexplicitlytoguaranteethatthe
veseparategraphs(drawnontopofeachotherinmultiplotmode)willhaveexactlythesameaxes. The
linetypemustbespecied;otherwisealltheplotswouldbedrawnwiththesametype. Seeanimate.demin
demodirectoryforananimatedexample.
Reset
Theresetcommandcausesallgraph-relatedoptionsthatcanbesetwiththesetcommandtotakeontheir
defaultvalues.Thiscommandisuseful,e.g.,torestorethedefaultgraphsettingsattheendofacommand
le,ortoreturntoadenedstateafter lotsofsettingshavebeenchangedwithinacommandle. . Please
refertothesetcommandtoseethedefaultvaluesthatthevariousoptionstake.
Thefollowingarenotaectedbyreset.
‘set term‘ ‘set t output‘ ‘ ‘set loadpath‘ ‘set fontpath‘ ‘ ‘set t linetype‘
‘set encoding‘ ‘set decimalsign‘ ‘set locale‘ ‘set psdir‘
reseterrorsclearsonlytheerrorstatevariablesGPVAL
ERRNOandGPVAL
ERRMSG.
resetbindrestoresallhotkeybindingstotheirdefaultstate.
Save
Thesavecommandsaves user-denedfunctions,variables,the settermstatus,allsetoptions,orallof
these,plusthelastplot(splot)commandtothespeciedle.
Syntax:
save {<option>} } ’<filename>’
where<option>isfunctions,variables,terminalorset. Ifnooptionisused,gnuplotsavesfunctions,
variables,setoptionsandthelastplot(splot)command.
savedlesarewrittenintextformatandmaybereadbytheloadcommand. Forsavewiththesetoption
orwithoutanyoption,theterminalchoiceandtheoutputlenamearewrittenoutasacomment,toget
anoutputlethatworksinotherinstallationsofgnuplot,withoutchangesandwithoutriskofunwillingly
overwritingles.
saveterminalwillwriteoutjusttheterminalstatus,withoutthecommentmarkerinfrontofit.Thisis
mainlyusefulforswitchingtheterminal settingfor ashortwhile,andgettingbacktothepreviouslyset
terminal,afterwards,byloadingthesavedterminalstatus. Notethatforasinglegnuplotsessionyoumay
ratherusetheothermethodofsavingandrestoringcurrentterminalbythecommandssettermpushand
settermpop,seesetterm(p. 154).
Thelenamemustbeenclosedinquotes.
Thespeciallename"-" maybeusedtosavecommandstostandardoutput. . Onsystemswhichsupport
a popenfunction(Unix), the output t of save canbe pipedthrough h an externalprogram m by starting the
lenamewitha’j’. Thisprovidesaconsistentinterfacetognuplot’sinternalsettings s toprogramswhich
communicatewithgnuplotthroughapipe. Pleaseseehelpforbatch/interactive(p.20)formoredetails.
Examples:
save ’work.gnu’
save functions s ’func.dat’
save var ’var.dat’
save set ’options.dat’
save term ’myterm.gnu’
save ’-’
save ’|grep title >t.gp’
gnuplot4.6
97
Set-show
Thesetcommandcanbeusedtosetlotsofoptions. Noscreenis s drawn,however,untilaplot,splot,or
replotcommandisgiven.
Theshowcommandshowstheirsettings;showallshowsallthesettings.
Optionschangedusingsetcanbereturnedtothedefaultstatebygivingthecorrespondingunsetcommand.
Seealsothereset(p.96)command,whichreturnsallsettableparameterstodefaultvalues.
If avariablecontains time/date data, showwill display it accordingto the format currently dened d by
set timefmt, evenifthat was notineectwhenthe variable wasinitially dened. . The e setandunset
commandsmayoptionallycontainaniterationclause.Seeiteration(p.71).
Angles
Bydefault,gnuplotassumestheindependentvariableinpolargraphsisinunitsofradians.Ifsetangles
degrees is speciedbeforeset polar,thenthe defaultrangeis[0:360]andthe independent variablehas
units of degrees. . This s is particularly usefulfor plots of data a les. . Theanglesettingalsoapplies s to o 3D
mappingassetviathesetmappingcommand.
Syntax:
set angles {degrees | radians}
show angles
Theanglespeciedinsetgridpolarisalsoreadanddisplayedintheunitsspeciedbysetangles.
set anglesalsoaects theargumentsofthemachine-denedfunctionssin(x),cos(x) andtan(x),andthe
outputsofasin(x),acos(x),atan(x),atan2(x),andarg(x). Ithasnoeectontheargumentsofhyperbolic
functionsor Besselfunctions. . However,theoutput t argumentsof inverse hyperbolicfunctions of complex
arguments are aected; ; if f these functions are used, , set angles s radians s must be in n eect t to o maintain
consistencybetweeninputandoutputarguments.
x={1.0,0.1}
set angles radians
y=sinh(x)
print y
#prints {1.16933, 0.154051}
print asinh(y) ) #prints s {1.0, 0.1}
but
set angles degrees
y=sinh(x)
print y
#prints {1.16933, 0.154051}
print asinh(y) ) #prints s {57.29578, 5.729578}
Seealso
poldat.dem: polar r plot using setangles demo.
Arrow
Arbitraryarrowscanbeplacedonaplotusingthesetarrowcommand.
Syntax:
set arrow {<tag>} {from <position>} {to|rto <position>}
{ {arrowstyle | as <arrow_style>}
| { { {nohead d | head | backhead | heads}
{size <length>,<angle>{,<backangle>}}
{filled | empty | nofilled}
{front | back}
{ {linestyle | ls <line_style>}
| {linetype | lt <line_type>}
{linewidth | lw <line_width} } } } }
98
gnuplot4.6
unset arrow {<tag>}
show arrow {<tag>}
<tag> is anintegerthatidenties the arrow. . If f notagis given,thelowest unusedtagvalueisassigned
automatically. The e tag canbeusedtodeleteor change aspecicarrow. . Tochange e anyattributeofan
existingarrow,usethesetarrowcommandwiththeappropriatetagandspecifythepartsofthearrowto
bechanged.
The<position>sarespeciedbyeitherx,yorx,y,z,andmaybeprecededbyrst,second,graph,screen,
orcharacter toselectthecoordinate system. . Unspeciedcoordinates s defaultto0. . Theendpoints s can
bespeciedinoneofvecoordinatesystems|rstorsecondaxes,graph,screen,orcharacter. See
coordinates(p.22)fordetails.Acoordinatesystemspecierdoesnotcarryoverfromthe"from"position
tothe"to"position. Arrowsoutsidethescreenboundariesarepermittedbutmaycausedeviceerrors.Ifthe
endpointisspeciedby"rto"insteadof"to"itisdrawnrelativelytothestartpoint.Forlinearaxes,graph
andscreencoordinates,thedistancebetweenthestartandtheendpointcorrespondstothegivenrelative
coordinate. Forlogarithmicaxes,therelativegivencoordinatecorrespondstothefactorofthecoordinate
betweenstartandendpoint. Thus,anegativerelativevalueorzeroarenotallowedforlogarithmicaxes.
Specifyingnoheadproducesanarrowdrawnwithoutahead|alinesegment.Thisgivesyouyetanother
waytodrawalinesegmentontheplot. Bydefault,anarrowhasaheadatitsend. Specifyingbackhead
draws anarrowheadatthestart pointofthearrowwhileheads draws arrowheadsonbothends ofthe
line.Notallterminaltypessupportdouble-endedarrows.
Headsizecanbecontrolledbysize<length>,<angle>orsize<length>,<angle>,<backangle>,where
<length>deneslengthofeachbranchofthearrowheadand<angle>theangle(indegrees)theymake
withthearrow. <Length> > isinx-axis units;this canbechangedby rst,second, , graph,screen,or
characterbeforethe<length>;seecoordinates(p.22)fordetails. <Backangle>onlytakeseectwhen
lledoremptyisalsoused.Then,<backangle>istheangle(indegrees)thebackbranchesmakewiththe
arrow(inthesamedirectionas<angle>).Thegterminalhasarestrictedbackanglefunction.Itsupports
threedierent angles. . Therearetwothresholds: : Below70degrees,thearrowheadgetsanindentedback
angle. Above110degrees,thearrowheadhasanacutebackangle.Betweenthesethresholds,thebackline
isstraight.
Specifying lledproduces lledarrowheads s (if heads are used). . Filling g is supported onlled-polygon
capableterminals,seehelpofpm3d(p. 136)fortheirlist,otherwisethearrowheadsareclosedbutnot
lled.Thesameresult(closedbutnotlledarrowhead)isreachedbyspecifyingempty.Further,llingand
outlineisobviouslynotsupportedonterminalsdrawingarrowsbytheirownspecicroutines,likemetafont,
metapost,latexortgif.
The line style may be selected d from m a user-dened d list t of line styles s (see set style line e (p. 151)) ) or
maybedenedherebyprovidingvaluesfor <line
type>(anindexfromthedefaultlistofstyles)and/or
<line
width>(whichisamultiplierforthedefaultwidth).
Note,however,thatifauser-denedlinestylehasbeenselected,itsproperties(typeandwidth)cannotbe
alteredmerelybyissuinganothersetarrowcommandwiththeappropriateindexandltorlw.
Iffrontisgiven,thearrowiswrittenontopofthegrapheddata. Ifbackisgiven(thedefault),thearrow
iswrittenunderneaththegrapheddata. Usingfrontwillpreventanarrowfrombeingobscuredbydense
data.
Examples:
Tosetanarrowpointingfromtheoriginto(1,2)withuser-denedstyle5,use:
set arrow to 1,2 ls 5
Tosetanarrowfrombottomleftofplottingareato(-5,5,3),andtagthearrownumber3,use:
set arrow 3 from graph 0,0 to -5,5,3
Tochangetheprecedingarrowtoendat1,1,1,withoutanarrowheadanddoubleitswidth,use:
set arrow 3 to o 1,1,1 1 nohead lw 2
Todrawaverticallinefromthebottomtothetopofthegraphatx=3,use:
set arrow from m 3, , graph 0 to 3, graph 1 nohead
gnuplot4.6
99
TodrawaverticalarrowwithT-shapeends,use:
set arrow 3 from 0,-5 to 0,5 heads size screen 0.1,90
Todrawanarrowrelativelytothestartpoint,wheretherelativedistancesaregiveningraphcoordinates,
use:
set arrow from m 0,-5 5 rto graph 0.1,0.1
Todrawanarrowwithrelativeendpointinlogarithmicxaxis,use:
set logscale x
set arrow from m 100,-5 5 rto 10,10
Thisdrawsanarrowfrom100,-5to1000,5. Forthelogarithmicx x axis,therelativecoordinate 10means
"factor10"whileforthelinearyaxis,therelativecoordinate10means"dierence10".
Todeletearrownumber2,use:
unset arrow 2
Todeleteallarrows,use:
unset arrow
Toshowallarrows(intagorder),use:
show arrow
arrows demos.
Autoscale
Autoscalingmaybesetindividuallyonthex,yorzaxisorgloballyonallaxes.Thedefaultistoautoscale
allaxes. Ifyouwanttoautoscalebasedonasubsetoftheplotsinthegure,youcanmarktheotherones
withthe agnoautoscale. Seedatale(p.78).
Syntax:
set autoscale {<axes>{|min|max|fixmin|fixmax|fix} | fix | keepfix}
unset autoscale e {<axes>}
show autoscale
where<axes> iseither x,y,z,cb,x2,y2 2 or r xy. . A A keywordwithminormax appended(this cannot
bedonewithxy)tellsgnuplottoautoscalejusttheminimumormaximumofthataxis. Ifnokeywordis
given,allaxesareautoscaled.
Akeywordwithxmin,xmaxorxappendedtellsgnuplottodisableextensionoftheaxisrangetothe
nextticmarkposition,forautoscaledaxesusingequidistanttics; setautoscale xsetsthis s forallaxes.
Commandsetautoscalekeepxautoscalesallaxeswhilekeepingthexsettings.
Whenautoscaling,theaxisrangeisautomaticallycomputedandthedependentaxis(yforaplotandzfor
splot)isscaledtoincludetherangeofthefunctionordatabeingplotted.
Ifautoscalingofthedependentaxis(yorz)isnotset,thecurrentyorzrangeisused.
Autoscalingtheindependentvariables(xforplotandx,yforsplot)isarequesttosetthedomaintomatch
anydatalebeingplotted. Iftherearenodatales,autoscalinganindependentvariablehasnoeect. In
otherwords,intheabsenceofadatale,functionsalonedonotaectthexrange(ortheyrangeifplotting
z=f(x,y)).
Pleaseseesetxrange(p.161)foradditionalinformationaboutranges.
Thebehaviorofautoscalingremainsconsistentinparametricmode,(seesetparametric(p.135)). How-
ever,therearemoredependentvariablesandhencemorecontroloverx,y,andzaxisscales. Inparametric
mode,theindependentordummyvariableistforplotsandu,vforsplots. autoscaleinparametricmode,
then,controlsallranges(t,u,v,x,y,andz)andallowsx,y,andztobefullyautoscaled.
Autoscalingworksthesamewayforpolarmodeasitdoesforparametricmodeforplot,withtheextension
thatinpolarmodeset dummycanbeusedtochangetheindependentvariablefromt(seeset dummy
(p. 111)).
100
gnuplot4.6
Whenticsaredisplayedonsecondaxesbutnoplothasbeenspeciedforthoseaxes,x2rangeandy2range
areinheritedfromxrangeandyrange. Thisisdonebefore xrangeandyrangeareautoextendedtoawhole
numberoftics,whichcancauseunexpectedresults. Youcanusethexminorxmaxoptionstoavoid
this.
Examples:
Thissetsautoscalingoftheyaxis(otheraxesarenotaected):
set autoscale y
Thissetsautoscalingonlyfortheminimumoftheyaxis(themaximumoftheyaxisandtheotheraxesare
notaected):
set autoscale ymin
Thisdisablesextensionofthex2axisticstothenextticmark,thuskeepingtheexactrangeasfoundinthe
plotteddataandfunctions:
set autoscale x2fixmin
set autoscale x2fixmax
Thissetsautoscalingofthexandyaxes:
set autoscale xy
Thissetsautoscalingofthex,y,z,x2andy2axes:
set autoscale
Thisdisablesautoscalingofthex,y,z,x2andy2axes:
unset autoscale
Thisdisablesautoscalingofthezaxisonly:
unset autoscale e z
Parametricmode
Wheninparametricmode(setparametric),thexrangeisasfullyscalableastheyrange. Inotherwords,
inparametricmodethexaxiscanbeautomaticallyscaledtottherangeoftheparametricfunctionthat
isbeingplotted. Ofcourse,theyaxiscanalsobeautomaticallyscaledjustasinthenon-parametriccase.
Ifautoscalingonthexaxisisnotset,thecurrentxrangeisused.
Data les s areplotted d the e same inparametric andnon-parametric mode. . However, , there is s a a dierence
inmixedfunctionanddataplots: innon-parametric c modewithautoscaledx, thex rangeof the datale
controlsthexrangeofthefunctions;inparametricmodeithasnoin uence.
For completeness s alast t command d set autoscale t t is accepted. . However, , theeect ofthis s "scaling" is
veryminor. Whengnuplot t determines thatthetrangewouldbeempty,itmakesasmalladjustment if
autoscalingistrue. Otherwise,gnuplotgivesanerror. . Suchbehaviormay,infact,notbeveryusefuland
thecommandsetautoscaletiscertainlyquestionable.
splotextendstheaboveideasasyouwouldexpect. Ifautoscalingisset,thenx,y,andzrangesarecomputed
andeachaxisscaledtottheresultingdata.
Polar mode
Wheninpolarmode(setpolar),thexrangeandtheyrangemaybeleftinautoscalemode.Ifsetrrange
isusedtolimittheextentofthepolaraxis,thenxrangeandyrangewilladjusttomatchthisautomatically.
However, explicit xrange andyrangecommands s canlater beusedtomake further adjustments. . See e set
rrange (p. 146). . Thetrange e may alsobe autoscaled. . Notethat t if the trange is containedwithin n one
quadrant,autoscalingwillproduceapolarplotofonlythatsinglequadrant.
Explicitlysettingoneortworangesbutnotothersmayleadtounexpectedresults.Seealso
polar demos.
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