Obtaining the dual in SPlus 1 Run the data through the Mstationary program on SPlus This program is available through the Department of Statist ics at SMU It is located at the following website httpfacultysmu eduhgray and instructions on using the M ID: 22682
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InstructionsforApplyingaButterworthFilterUsingMatlabInthisdocument,thestepsnecessaryforapplyingaButterworth ltertoM-stationarydataaregiven.ObtainingthedualinS-Plus:1.RunthedatathroughtheM-stationaryprogramonS-Plus.ThisprogramisavailablethroughtheDepartmentofStatisticsatSMU.Itislocatedatthefollowingwebsite.http://faculty.smu.edu/hgray,andinstructionsonusingtheM-stationarylibraryareincluded.2.Besuretoexportthedualbyclickingonthe\Results"tabandthenonthe\ExportDual"button.Thiswillallowtheusertosavethedataintheappropriatelocation.UsingMatlabtoButterworthlowpass lterthedata:3.ImportthedataintoMatlabbyfollowingtheinstructionsonMatlab's\ImportWizard".Forthepurposeshere,supposethedualdatasetiscalledseries1inMatlab.4.ThefollowingcommandwillcreateasecondorderlowpassButterworth lter.[b,a]=butter(2,.1);Forotherorders,importtheordernumberinplaceofthe2.5.Toapplythe ltertoseries1,usefilt=filter(b,a,series1);6.Tosavethe ltereddatainASCIIformat,thecommandissaveseries1f2.outfilt-ASCII;The lewillbesavedasseries1f2.outinASCIIformat.Foraquickreferenceforthecommandinstep4pertainingtoeach ltertype,seeTable1.1 Table1:QuickReferenceforMatlabButterworthFiltersFilterTypeCommandCommentsLowpass[b,a]=butter(2,.1);Appliesasecondorder lterthatpassesallfrequenciesbelow0.10Highpass[b,a]=butter(2,.1,'high');Appliesasecondorder lterthatpassesallfrequenciesabove0.10Bandpass[b,a]=butter(2,[.1,.2]);Appliesasecondorder lterthatpassesallfrequenciesbetween0.10and0.20Bandstop[b,a]=butter(2,[.1,.2],'stop');Appliesasecondorder lterthatstopsallfrequenciesbetween0.10and0.202