关于Matlab中GUI的Sharing Data among Callbacks and Sub Functions.docx

关于Matlab中GUI的Sharing Data among Callbacks and Sub Functions.docx

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关于Matlab中GUI的SharingDataamongCallbacksandSubFunctions

MATLABGUITutorial-SharingDataamongCallbacksandSubFunctions

14Nov2007QuanQuach69comments14,141views

Introduction

ForthemajorityofGUIsthatyoucreateinMatlab,youwillhavetobeabletosharedataamongthecomponentcallbacks.Onewayofaccomplishingthisistousethehandlesstructuretostorethatdata.Inthistutorial,youwilllearnhowtodoso.

ThistutorialiswrittenforthosewithlittleexperiencecreatingaMatlabGUI（GraphicalUserInterface）.Ifyou’renewtocreatingGUIsinMatlab,youshouldvisitthistutorialfirst.BasicknowledgeofMatlabisrecommended.Matlabversion2007aisusedinwritingthistutorial.Bothearlierversionsandnewversionsshouldbecompatibleaswell（aslongasitisn’ttoooutdated）.Let’sgetstarted!

SharingDataBetweenCallbacks

AsimpleexampleofsharingdataamongcallbacksistoincrementanumericalcounterontheGUIeachtimeANYbuttonontheGUIispressed.Howcanthisbedone?

Thistutorialwillexplainhow.

1.First,downloadthesampleGUIhere.Unzipthefilesandplacethemwhereveryouplease.

2.Now,typeguideatthecommandprompt.

3.ChoosetoopenthesampleGUIbyclickingon“OpenExistingGUI”.Clickon“Browse”tolocatewhereyousavedtheGUIfiles.

4.HereiswhattheGUIshouldlooklikewhenyouopenit:

5.Clickonthe

iconontheGUIfiguretobringuptheaccompanying.mfile.

6.Thefirstthingweneedtodoistodefineavariablethatwillholdthevalueforournumericalcounter.Placethefollowingcodeinhandles_tutorial_OpeningFcn.

7.handles.buttonCounter=0;

set（handles.text1,'String','0'）;

Makesureyouplaceitrightbeforethislineofcode:

guidata（hObject,handles）;

8.Noticethatwedefinedthevariablenameashandles.buttonCounter,ratherthanbuttonCounter.Ifwedidnotdefinethevariablewithinthehandlesstructure,thenitwouldbeconsideredalocalvariable.Beingalocalvariablemeansthatthevariabledoesnotexistoutsideofthefunctionwhereitwasdefined.Thusweneedtostoreitintothehandlesstructure,sothatitcanbeaccessedandmodifiedlaterintheothercallbacks.So,ifyouwantdatatobeavailabletoALLcallbacks,youmuststoreitinthehandlesstructures.

9.Addthiscodetobothpushbutton1_Callbackandradiobutton1_Callback

10.handles.buttonCounter=handles.buttonCounter+1;

11.set（handles.text1,'String',num2str（handles.buttonCounter））;

12.guidata（hObject,handles）;%withoutthisline,thehandlesstructurewouldnotupdate,

%andthecounterwouldnotincrement.

13.Now,savethe.mfileandruntheGUI.Tryclickingonthebuttonstoincrementthecounter.NoticethatthecounterincrementswhenyouactivateANDdeactivatetheradiobutton.

SharingDataBetweenCallbacksandSubFunctions

Itisgoodpracticetomakeyourfunctionsmodularsothatyourcodeiseasilyadaptable,robust,andflexible.Havingsaidthat,passingtheentirehandlesstructurestosubfunctionsissomethingthatIdon’trecommend.Buttheremightbeatimewhenyouneedtoaccesstheentirehandleswithinasubfunction.Soheregoes.

function[handles]=mySubFunction（handles）

%insertcodehere

%

%

Thisfunctionwillallowyoutousethehandlesdatawithinthesubfunction,andwillalsoupdateanychangesmadewithinthesubfunction.Youcanaddasmanyinputsandoutputsasdesired.

Whenyoucallthisfunction,makesuretocallitinthefollowingmanner:

[handles]=mySubFunction（handles）;

Thisistheendofthetutorial.

69Responsesto“MATLABGUITutorial-SharingDataamongCallbacksandSubFunctions”

1.on20Nov2007at10:

02am1manisree

greattutorials…indeedveryhelpful.thanksalot

2.on18Feb2008at11:

36am2Vishal

Ivejustspentthelast2hourspullingmyhairout,asimoneofmyfunctionswasreadinginvaluesfor2variables,andithenlatercallafunction（ifdesired）toplotaPZmap,anditmatlabrefusedtounderstandthatthevariableswherethere,untilirealisedthattheywherejuslocalvariables!

Itriedallsortsofhandlesstuff,untilifoundthis,manyouguysarethereasonimightgetagoodgradeformyfinalyearproject!

!

!

3.on15Mar2008at10:

00am3Brinkis

HalloQuanQuach,

I’vepassedthoughallofyourtutorials.They’rereallygreatandhelpfull.AtfirstIwouldliketogiveabigthanksforthemandaroundofcyber-beer

Theideaofusingglobalvariableshelpedmealot.

AndsecondIwouldliketoaskforinformationhowtosolvedifferentialequationscorrectly.Ifoundeditdifficult,pleasehelp

IhavetomakeaGUIthatsolvesmaxwell’sequationsindifferentialformfor~1kkpointsandplotsresultsin3Dgraphic.It’sEMwavecomputingusingFDTDmethod.Anyhelpwillbeappreciated.Thanksinadvance

4.on15Mar2008at1:

54pm4QuanQuach

HiBrinkis,

IwouldprobablyuseSimulinktomodelthedifferentialequationandthenhavetheGUIincorporatetheSimulinkmodel.Unfortunately,I’mnotverygoodwithsimulink.

Here’sagreattutorialonusingsimulink:

Visitthistutorialonceyoucompleteyourmodel!

5.on19Mar2008at10:

37am5Brinkis

HalloQuanQuach,

I’vefailedtofoundsimulinkfordownload

andmymatlab2007don’tcontainit

AfterI’veredthesetutorialsaboutsimulinkI’vefiguredoutthatsimulinkissomethinglikeatoolformaking“logicalschema”.

AllIneedistowriteacodeformatlabtoperformacycle.Ineedmatlabtodescribematerialofeachpoint,thensolveequationtofoundanangleforradiationpatternrefersto（thedirectional（angular）dependenceofradiationfromtheantenna）andthensolve6differentialMaxwell’sequationstofindthevalueofelectromagneticalfieldinthatpoint.Andwheneverythingisdone-plotresultsin3Ddiagram（pointsshouldbe2Dandaddingvalueofeverypointweshouldget3Dview）.

ThepointI’mleadingtoisthatIalreadyknowhowthisshouldlooklikeinmatlab,butcan’timaginehowtoperformitwithsimulink.QuanQuach,ifyouhaveanyexperienceinwritingcodewithdifferentialequations,pleasehelp

anyhintwillbeappreciated

cheers,

6.on19Mar2008at10:

39am6QuanQuach

HelloBrinkis,

I’mveryrustywithdifferentialequationswithinmatlab,soIwon’tbeofmuchhelpthere.OneofthesedaysIwilluncoverthatrustandwriteatutorialondifferntialequationsandmatlab.

Quan

7.on19Mar2008at11:

00am7Brinkis

Thanksforsuchaquickreply

Andthanksforyourtutorialaboutdifferentialequationsinadvance

I’llworkonsolvingPartialdifferentialequationeithertohavemoreexperiance

8.on21Mar2008at11:

27am8Belo

helloQuanQuanch,

ifollowedyourtutorial（verygood…）forcreatingglobalvariables.

ifiwanttodeleteoneofthis,whatshouldido?

?

?

?

thanksalot……

9.on21Mar2008at1:

08pm9DanielSutoyo

HeyBelo

Youcantypecommand“whos”toseethevariablesyouhaveinworkspacethenuse“clearvariablename”toeliminatethespecificvariable

10.on21Mar2008at2:

33pm10Belo

thanksDaniel,

itriedit,butitdoesn’twork..

ithinktheproblemisthatthevariableisn’ta‘true’variablebutisapartofthehandlesstructure（orsoiunderstand….）.

11.on21Mar2008at3:

48pm11DanielSutoyo

ahifyouaretalkingabouthandlesstructureyesitwouldbedifferent

usethecommand

rmfield（handle,‘name’）

toremove

handle.name

12.on23Mar2008at12:

57pm12Belo

thanksalot….

that’swhatineed

13.on02Apr2008at4:

44am13AdamBright

Hithere,

ihavecreatedtwolistboxeswhichwillbethestarttimeandendtimewhichiwanttoappearasthexaxisonmygraph.Atthemomentmyscriptreferstoanarraycalled‘time’asthex-axis.

Iwouldliketobeabletoselectthestartandendtimefromthesetwolistboxesandthenpressthegraphbuttontoproduceagraphforthatrange.

Ihavenoideahowtolinkthelistboxtothearray‘time’orhowtomakethescriptihavemaderefertothesedateswhichhavebeenchosen.

I’mreallystuckandwouldbegratefulforanyhelp.

manythanks

%AssingingVariables

[time,number,pressure,raininput]=textread（’staticvirginia.txt’,'%s%d%f%f’,'delimiter’,',’,'headerlines’,4）;

%Ifstatementtoconvertpressureintovolume

case1=（pressure=995.7&pressure=1149.2）;

volume=zeros（size（pressure））;

volume（case1）=（（pressure（case1）-442.95）*5.365）;

volume（case2）=（（pressure（case2）-749.29）*12.034）;

volume（case3）=（（pressure（case3）-934.08）*22.371）;

cumvol=volume;

fori=2:

length（cumvol）,ifcumvol（i）

zerovol=（cumvol-（cumvol（1,1）））;

%values=3000*（ones（size（zerovol）））;

runoff=zerovol/3000;

cumrain=cumsum（raininput）;

%5minuterainvalues

cumrain5=cumrain（1:

5:

end）;

runoff5=runoff（1:

5:

end）;

%Discretisedvaluesforcumrainandrunoff

d=2:

length（cumrain5）;

disccumrain=（cumrain5（d））-（cumrain5（d-1））;

e=2:

length（runoff5）;

discrunoff=（runoff5（e））-（runoff5（e-1））;

%GraphPlottingInformation

timeplot=datenum（time,‘”yyyy-mm-ddHH:

MM:

SS”‘）;

timeplot5=timeplot（3:

5:

end）;

[AX,H1,H2]=plotyy（timeplot5,disccumrain,timeplot5,discrunoff,’bar’）;

set（gcf,‘color’,‘white’）;

set（H1,’BarWidth’,0.4,…

‘EdgeColor’,[00.7490.749],…

‘FaceColor’,[00.7490.749],…

‘LineStyle’,'–’）

set（H2,’BarWidth’,0.4,…

‘EdgeColor’,[0.68240.46670],…

‘FaceColor’,[0.68240.46670],…

‘LineStyle’,':

’）

set（AX

（2）,’YLim’,[01]）

set（AX

（1）,’YLim’,[01]）

set（AX

（1）,’YTick’,[00.10.20.30.40.50.60.70.80.91]）

set（AX

（2）,’YTick’,[00.10.20.30.40.50.60.70.8