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3
Spreadsheets
• “WaystoImportSpreadsheets”onpage3-2
• “SelectSpreadsheetDataUsingImportTool”onpage3-3
• “ImportaWorksheetorRangewithxlsread”onpage3-7
• “ImportAllWorksheetsinaFilewithimportdata”onpage3-9
• “SystemRequirementsforImportingSpreadsheets”onpage3-11
• “WhentoConvertDatesfromExcelFiles”onpage3-12
• “ExporttoExcelSpreadsheets”onpage3-14
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3
Spreadsheets
WaystoImportSpreadsheets
ThereareseveralwaystoreaddatafromaspreadsheetfileintotheMATLAB
workspace:
• “SelectSpreadsheetDataUsingImportTool”onpage3-3
• “ImportaWorksheetorRangewithxlsread”onpage3-7
• Importaworksheetorrangetoatableusingthe
readtable
function
• “ImportAllWorksheetsinaFilewithimportdata”onpage3-9
Alternatively,pastedatafromtheclipboardintoMATLABusingoneofthe
followingmethods:
• OntheWorkspacebrowsertitlebar,click
,andthenselectPaste.
• OpenanexistingvariableintheVariableseditor,right-click,andthen
selectPasteExcelData.
• Call
uiimport -pastespecial
.
SomeimportoptionsrequirethatyoursystemincludesExcelforWindows.
Formoreinformation,see“SystemRequirementsforImportingSpreadsheets”
onpage3-11.
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SelectSpreadsheetDataUsingImportTool
SelectSpreadsheetDataUsingImportTool
Inthis section...
“SelectDataInteractively”onpage3-3
“ImportDatafromMultipleSpreadsheets”onpage3-5
SelectDataInteractively
Thisexampleshowshowtoimportdatafromaspreadsheetintothe
workspacewiththeImportTool. Theworksheetinthisexampleincludes
threecolumnsofdatalabeled
Station
,
Temp
,and
Date
:
Station
Temp
Date
12
98
9/22/2010
13
x
10/23/2010
14
97
12/1/2010
OntheHometab,intheVariablesection,clickImportData
.
Alternatively,intheCurrentFolderbrowser,double-clickthenameofafile
withanextensionof
.xls
,
.xlsx
,
.xlsb
,or
.xlsm
.TheImportToolopens.
Selectthedatayouwanttoimport.IntheImportedDatasection,selecthow
youwantthedatatobeimported. Thefollowingtableindicateshowdatais
importeddependingontheoptionyouselect.
OptionSelected
HowDataisImported
Columnvectors
Importeachcolumnoftheselected
dataasanindividual
m
-by-1vector.
Matrix
Importselecteddataasan
m
-by-
n
numericarray.
CellArray
Importselecteddataasacellarray
thatcancontainmultipledatatypes,
suchasnumericdataandtext.
Table
Importselecteddataasatable.
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3
Spreadsheets
Forexample,thedatainthefollowingfigurecorrespondstoa3-by-3matrix
named
untitled
.Youcaneditthevariablenamewithinthetab,andyoucan
selectnoncontiguoussectionsofdataforthesamevariable.
Ifyouchoosetoimportasamatrixornumericcolumnvectors,thetool
highlightsanynonnumericdataintheworksheet. Eachhighlightcolor
correspondstoaproposedruletomakethedatafitintoanumericarray.For
example,youcanconvertspreadsheetdatestoMATLABserialdatenumbers.
Youcanseehowyourdatawillbeimportedwhenyouplacethecursorover
individualcells.
Youcanadd,remove,reorder,oreditrules,suchaschangingthereplacement
valuefrom
NaN
toanothervalue.Allrulesapplytotheimporteddataonly,
anddonotchangethedatainthefile. Youmustspecifyrulesanytime
therangeincludesnonnumericdataandyouareimportingintoamatrix
ornumericcolumnvectors.
Anycellsthatcontain
#Error?
correspondtoformulaerrorsinyour
spreadsheetfile,suchasdivisionbyzero. TheImportToolregardsthese
cellsasnonnumeric.
WhenyouclicktheImportSelectionbutton
,theImportToolcreates
variablesinyourworkspace.
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SelectSpreadsheetDataUsingImportTool
FormoreinformationoninteractingwiththeImportTool,watchthisvideo.
ImportDatafromMultipleSpreadsheets
Ifyouplantoperformthesameimportoperationonmultiplefiles,youcan
generatecodefromtheImportTooltomakeiteasiertorepeattheoperation.
Onallplatforms,theImportToolcangenerateaprogramscriptthatyoucan
editandruntoimportthefiles. OnMicrosoftWindowssystemswithExcel
software,theImportToolcangenerateafunctionthatyoucancallforeach
file.
Forexample,supposeyouhaveasetofspreadsheetsinthecurrentfolder
named
myfile01.xlsx
through
myfile25.xlsx
,andyouwanttoimportthe
samerangeofdata,
A2:G100
,fromthefirstworksheetineachfile.Generate
codetoimporttheentiresetoffilesasfollows:
1
OpenoneofthefilesintheImportTool.
2
FromtheImportbutton,selectGenerateFunction. TheImportTool
generatescodesimilartothefollowingexcerpt,andopensthecodeinthe
Editor.
function data = importfile(workbookFile, , sheetName, range)
%IMPORTFILE
Import numeric data from a spreadsheet
...
3
Savethefunction.
4
Inaseparateprogramfileoratthecommandline,createa
for
loopto
importdatafromeachspreadsheetintoacellarraynamed
myData
:
numFiles = 25;
range = 'A2:G100';
sheet = 1;
myData = = cell(1,numFiles);
for fileNum = 1:numFiles
fileName = = sprintf('myfile%02d.xlsx',fileNum);
myData{fileNum} = importfile(fileName,sheet,range);
end
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3
Spreadsheets
Eachcellin
myData
containsanarrayofdatafromthecorresponding
worksheet. Forexample,
myData{1}
containsthedatafromthefirstfile,
myfile01.xlsx
.
3-6
ImportaWorksheetorRangewithxlsread
ImportaWorksheetorRangewithxlsread
Inthis section...
“ReadingfromaSpreadsheet”onpage3-7
“GettingInformationaboutaSpreadsheet”onpage3-8
ReadingfromaSpreadsheet
Considerthefile
climate.xlsx
createdwith
xlswrite
asfollows:
d = = {'Time', 'Temp';
12 98;
13 99;
14 97}
xlswrite('climate.xlsx', d, , 'Temperatures');
Toimportthenumericdataintoamatrix,use
xlsread
withasinglereturn
argument.
xlsread
ignoresanyleadingroworcolumnoftextinthenumeric
result:
ndata = xlsread('climate.xlsx', 'Temperatures')
ndata =
12
98
13
99
14
97
Toimportbothnumericdataandtextdata,specifytworeturnvaluesfor
xlsread
:
[ndata, headertext] = xlsread('climate.xlsx', 'Temperatures')
ndata =
12
98
13
99
14
97
headertext =
3-7
3
Spreadsheets
'Time'
'Temp'
Toreadonlythefirstrowofdata,specifytherange:
firstrow = xlsread('climate.xlsx', 'Temperatures', 'A2:B2')
firstrow =
12
98
Note ExcelandMATLABcanstoredatesasstrings(suchas
'10/31/96'
)
ornumbers(suchas
35369
or
729329
). IfyoursystemdoesnothaveExcel
forWindows,orifyourfileincludesnumericdates,see“WhentoConvert
DatesfromExcelFiles”onpage3-12.
The
readtable
functioncanimportmixed-type,column-orienteddatafrom
aspreadsheetintoatableinasimilarmanner. Formoreinformation,see
“CreateaTable”.
GettingInformationaboutaSpreadsheet
TodeterminewhetherafilecontainsareadableExcelspreadsheet,usethe
xlsfinfo
function.Forreadablefiles,
xlsfinfo
returnsanonemptystring,
suchas
'Microsoft Excel Spreadsheet'
.Otherwise,itreturnsanempty
string(
''
).
Youalsocanuse
xlsfinfo
toidentifythenamesoftheworksheetsinthe
file,andtoobtainthefileformatreportedbyExcel. Forexample,retrieve
informationonthespreadsheet
climate.xlsx
:
[type, sheets] = = xlsfinfo('climate.xlsx')
type =
Microsoft Excel l Spreadsheet
sheets =
'Sheet1'
'Sheet2'
'Sheet3'
'Temperatures'
3-8
Import AllWorksheetsinaFilewithimportdata
ImportAllWorksheetsinaFilewithimportdata
The
importdata
functionreadsdatafromanExcelfileintoastructure.
Continuingtheexamplein“ImportaWorksheetorRangewithxlsread”on
page3-7,wherethedataincludescolumnheaders,acalloftheform
climate = = importdata('climate.xlsx')
% with column n headers
returnsthenestedstructurearray
climate =
data: [1x1 struct]
textdata: [1x1 struct]
colheaders: [1x1 struct]
StructurescreatedfromExcelfileswithrowheadersincludethefield
rowheaders
,whichalsocontainsa1-by-1structure.
Thestructurenamed
data
containsonefieldforeachworksheetwithnumeric
data. Theotherstructurescontainonefieldforeachworksheetwithtext
cellsorheaders. Inthiscase:
climate.data =
Temperatures: [3x2 double]
climate.textdata =
Temperatures: {'Time'
'Temp'}
climate.colheaders =
Temperatures: {'Time'
'Temp'}
IftheExcelfilecontainsonlynumericdata(noroworcolumnheaders,andno
innercellswithtext),theoutputstructureissimpler.
importdata
returnsa
1-by-1structure,withonefieldforeachworksheetwithdata.
Forexample,ifthe
Temperatures
worksheetin
climate_nums.xlsx
does
notincludecolumnheaders,thecall
ndata = importdata('climate_nums.xlsx')
% only numeric data
returns
3-9
3
Spreadsheets
ndata =
Temperatures: [3x2 double]
Note ExcelandMATLABcanstoredatesasstrings(suchas
'10/31/96'
)
ornumbers(suchas
35369
or
729329
). IfyoursystemdoesnothaveExcel
forWindows,orifyourfileincludesnumericdates,see“WhentoConvert
DatesfromExcelFiles”onpage3-12.
3-10
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