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AS136材質(zhì)出售模具壽命一般是多久

時(shí)間:2022-11-04 02:10:45

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  Documentation>

  Generalappliedmath,

  Statistics

  Performsk-meansclusteringviatheHartiganandWongAS-136algorithm.

  Availableinversion6.3.0andlater.

  functionkmeans_as136(

  x:numeric,;floatordouble

  k[1]:integer,

  opt[1]:logical

  return_val:floatordouble

  Thereturnarray(say),clcnter,willcontainthecluster

  centers.Itwillbedimensioned(k,N),whereN

  collectivelyrepresentsthe'variable'dimension(s).

  clcnterwillhavethefollowingattributesassociatedwithit:

  id-aone-dimensionalintegerarrayof

  sizeMindicatingtheclustertowhicheachobservationis

  assigned.

  npts-aone-dimensionalintegerarrayof

  sizekcontainingthenumberofpointsineachcluster.

  ss2-aone-dimensionaldoublearrayof

  sizekcontainingthewithin-clustersumofsquares.

  K-meansisacentroid-basedclustermethod.

  Theobservationsareallocatedtokclustersinsuchawaythatthe

  within-clustersumofsquaresisminimized.K-meansclusteringrequiresthat

  thenumberofclusterstobeextractedbespecifiedinadvance.

  Asnotedby

  "Thenumberofclustersshouldmatchthedata.Anincorrectchoiceofthenumberofclusterswillinvalidatethewholeprocess.AnempiricalwaytofindthebestnumberofclustersistotryK-meansclusteringwithdifferentnumberofclustersandmeasuretheresultingsumofsquares."

  Thek-meansalgorithmworksreasonablywellwhenthedatafitstheclustermodel:

  Thenumberofclustersis'consistent'withthedata.

  Thedatapointswithinaclusterarecenteredaroundthatcluster

  Thespread/varianceoftheclustersissimilar,ieeachdatapointbelongstotheclosestcluster

  Limitations:K-meansmayhaveproblemswhenclustersareofverydifferingsizes;

  outliersarepresent;oremptyclustersexist.

  TheoriginalcodeiscreatedforCartesiangrids.Iftheapplicationrequiresusinggridpoints

  orstationslocatedathighlatitudes,itissuggestedthat

  css2cbeused

  tointerpolatetoCartesiancoordinates.Thesebetterreflectthetruedistancesandshouldbeinputtothefunction.

  Themodifiedcodeusedbythisfunctionwasdownloadedfrom

  JohnBurkardt'swebsite.

  TheoriginalHartigan&WongFortrancodewasfrom:

  JohnHartigan,ManchekWong,

  AlgorithmAS136:

  AK-MeansClusteringAlgorithm,

  AppliedStatistics,

  Volume28,Number1,1979,pages100-108.

  Example1:Thesourceofthisexampleis

  Defaultoptionsareused.

  v0(/1.0,1.5,3.0,5.0,3.5,4.5,3.5/);1stvariable

  v1(/1.0,2.0,4.0,7.0,5.0,5.0AS136材質(zhì)出售,4.5/);2ndvariable

  mdimsizes(v1);#observations

  n2;#variables

  k2;#clusters(userspecified)

  xnew((/n,m/),typeof(v1),"No_FillValue")

  x(0,:)v0

  x(1,:)v1

  clcntrkmeans_as136(x,kAS136材質(zhì)出售,False);usedefaultoptions

  print(clcntr);(1.25,1.5)and(3.9,5.1)

  Aneditedversionoftheoutputfollows:

  Variable:clcntr

  Type:float

  TotalSize:16bytes

  4values

  NumberofDimensions:2

  Dimensionsandsizes:[2]x[2](kcX(:,{-30:30},:);x(timeAS136材質(zhì)出售,lat,lon)

  ;reorderviaNCL'snameddimensionreordering

  xrx(lat|:,lon|:,time|:);make'time'(observations;M)therightmostdimension

  ;thelat,lonarethe'variables'(N)

  k3;#clusters(userspecified)

  optTrue

  opt@iseed1

  clcntrkmeans_as136(xr,k,opt);inputthereorderedarray

  :;clcntr(3,nlat,mlon)

  delete(xr);deleteifnolongerneeded(notnecessary)東锜精密模具代理分銷(xiāo)美國(guó)(芬可樂(lè))、日本(日立、大同、新日鐵)、德國(guó)(薩斯特、布德魯斯)、瑞典(進(jìn)口)、歐洲(進(jìn)口)等進(jìn)口優(yōu)質(zhì)特殊鋼材,公司通過(guò)嚴(yán)格的進(jìn)貨標(biāo)準(zhǔn)及先進(jìn)的品質(zhì)檢測(cè)儀器,保證為客戶提供合格優(yōu)質(zhì)的產(chǎn)品。

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