NCL常见错误解决方案.docx

NCL常见错误解决方案.docx

《NCL常见错误解决方案.docx》由会员分享，可在线阅读，更多相关《NCL常见错误解决方案.docx（112页珍藏版）》请在冰豆网上搜索。

NCL常见错误解决方案

NCLFrequentlyAskedQuestions（FAQ）

Basics | NCLcorelanguage | Fileinput/output | Datahandling | Dataanalysis | Visualization | Arrayfunctions |Outputformats | Errormessages | Memoryissues | Documentation | Miscellaneous |

Basics

1.WherecanIdownloadNCL?

2.I'mhavingproblemsdownloadingNCLfromtheESGwebsite.

3.HowdoIsetupmyenvironmenttorunNCL?

4.HowdoIrunNCL?

5.HowdoIdeterminetheversionofNCL?

6.ArethereanyemaillistsIcanjoin?

7.WherecanIseesomeexamplesofhowtouseNCL?

8.ArethereanyNCLcommandlineoptionsIcanuse?

9.ArethereanyeditorenhancementsforeditingNCLscripts?

10.IfI'mrunningNCLinteractively,arethereanycommand-lineshortcutsIcanuse?

11.IfI'mrunninginteractively,howcanIloadsomeexistingNCLcode?

12.IsthereanywayIcanturnoffthepreceding"（n）"outputwhenIprintabunchofvalues?

13.MyNCLscriptisquittingsuddenly,andI'mnotsurewhereand/orwhy.

14.HowdoItellifIhaveanOPeNDAP-enabledNCL?

NCLcorelanguage

1.HowdoIcommentalineinNCL?

Isthereawaytohaveablockofcomments?

2.IsthereacontinuationcharacterinNCL?

3.HowdoIeasilyconvertanumbertoastring?

4.HowdoIcreateanewvariablethatdoesn'tcontaina_FillValueattribute?

5.HowdoIcreateadouble,long,short,orbytevariablewithoutusing"new"oroneoftheconversionroutines,like"integertobyte"?

6.HowdoIincludethedoublequote（"）characterinanNCLstring?

7.CanNCLpromptforuserinput?

8.IsitpossibletohaveglobalvariablesinNCL?

9.HowcanIdeletemultipleNCLvariableswithonestatement?

10.HowdoIdeleteanameddimension?

11.IsthereawaytoseetheloadedvariablesandtheirdimensionsinNCLsimilarto"whos"inmatlab?

12.I'mgettinganunexpectedvaluewhenIusethepower（'^'）operatorcombinedwithanegativevalue.

13.HowdoIcreatealistofstringintegerswithleadingzeros（"008","009","010",etc）?

14.HowdoIgetthecurrentdateintoNCLasastring?

15.HowdoIgetalistoffilesintoanarrayofstringsinNCL?

16.HowcanIrecursivelygetalistoffilesinadirectorytreeintoNCL?

17.HowdoIconcatenatestringsandvaluesinNCL?

18.HowdoIretrieveanenvironmentvariableinNCL?

19.HowdoIprintnicelyformatted,multiplecolumnsofdatainNCL?

20.Canmultiplevariablesbereturnedfromausercreatedfunction?

Fileinput/output

1.What'stheeasiestwaytoconvertaGRIB1,GRIB2,HDF4,orHDF-EOS2filetoaNetCDFfile?

2.HowdoIdumpthecontentsofaGRIB,HDF,orHDF-EOSfile（orvariableonthefile）tothescreen?

3.HowdoIconvertalargefiletoaNetCDFfile?

4.HowdoIwritealarge（>2GB）variabletoanetCDFfile?

5.HowdoIgetthelatesttablesforreadingGRIBfiles?

6.WhyhavesomeofmyGRIB2variablenameschangedsinceIupdatedtoNCL V5.2.0?

7.HowdoIwriteascalartoaNetCDFfile?

8.HowdoIretainmetadataforavariablethatwasreadoffaseriesoffilesusing"addfiles"?

9.HowdoIaccessanNCLfilevariable,attributes,orcoordinatearraysiftheyhavehyphens/dashes（'-'）inthename?

10.HowdoIread/writeNetCDF,HDF4,HDF-EOS2,GRIB1,GRIB2,orCCMHistoryTapefiles?

11.HowdoIread/writeASCIIfiles?

12.HowdoIreadCSVfiles?

13.HowdoIwriteaformattedASCIIfile?

14.HowdoIreadanASCIIfileifIdon'tknowhowmanylinesitcontains?

15.HowdoIreadanASCIIfilethatcontainsdelimiters?

16.HowdoIread/writebinaryfiles?

17.OnceI'veopenedafilewith"addfile",howdoIfindoutwhatvariablesandattributesitcontains?

18.Isthereawaytocontrolwhethermybinaryfileisreadorwrittenaslittleendianorbigendian?

19.I'mhavingtroublereadingaFortranbinaryfilewithrecords.

20.I'mtryingtoconvertafiletoaNetCDFfileusing"ncl_convert2nc",butgettinganerrormessageaboutviolatingformatconstraints.

21.WhydoIgetdifferentresultswhenreadingmyHDF-EOS2file,dependingonwhetherIusethe".hdf"or".hdfeos"extension?

22.CanIreadshapefilesusingNCL?

23.HowcanIgetatvgroupdataonmyHDF4file?

24.WhenIrunmyscript,I'mgettinganerrormessage"ncclose:

ncid0:

NetCDF:

NotavalidID".

25.WhenItrytoaccesstheClimateDiagnosticsCenter[CDC]OPeNDAPserverviaNCL,Iget"Permissiondenied".

26.I'mrunningintoaproblemwhenopeninglotsoffileswithaddfileoraddfiles（"Toomanyfilesopen"）.

Datahandling

1.HowdoIsetamissingvalueformydata?

2.HowdoIdetermineifmydatacontainsanymissingvalues,orcounthowmanymissingvaluesithas?

3.HowdoIchangethemissingvaluetoanothervalue?

4.HowdoIdealwithNaN（not-a-number）valuesinmydata?

5.HowdoIdealwith"Inf"（infinity）valuesinmydata?

Dataanalysis

1.HowdoIaveragevaluesinamulti-dimensionedarray?

2.HowcanIdoanelement-wiseminimum/maximumbetweentwoarraysofthesamesize?

3.HowdoIinterpolatemy2-dimensionalrandomdatatoa2-dimensionalgriddedarray?

4.HowdoIinterpolatemy3-dimensionalrandomdatatoa3-dimensionalgriddedarray?

5.HowcanIfigureoutifaparticularlatitude/longitudepointiswithinaspecificarea,likeEurope?

Visualization

1.HowcanIcreatean"editable"graphicsfilerequiredforjournalpublication?

2.HowcanImaximizethesizeofaplotintheframe?

3.HowdoIgetmultipleplotsonapage?

4.What'sagoodwaytogenerateacolormap（table）?

5.Mymapprojectiondoesn'tlookright.

6.HowdoIchangeallofmyfontstobethesameinmyvisualization?

7.HowcanIchangethetextfunctioncodetosomethingotherthanacolon?

8.HowcanIgetadegreesymbolinatextstring?

9.HowcanIgetthingslikeaccentsorumlautsovermytext?

10.HowcanIgetspecialcharacters,likeGreeksymbols,inmygraphicaltextstrings?

11.CanIuserealPostScriptfontsinmyPostScriptfile?

12.I'mhavingtroubleimportingaPSfileintoanapplicationlikeAdobeIllustrator.

13.HowcanIgetthelengthofmyaxestobethesameratioastherangeofmyaxes?

14.HowdoIchangetheaspectratioorsizeofmymaporplot?

15.CanIsetcolorresourcesbycolornameratherthancolorindexvalues?

16.HowcanIspeedupthedrawingoffilledcontoursinNCL?

17.CanIchangecolorindexvaluesorcolormapsinmid-frame?

18.HowdoIgetmyPostScript/PDFoutputtocovermostofan8-1/2"x11"page?

19.HowcanIcontrolthesizeandlocationoftheX11windowthatNCLbringsup?

20.HowdoItellNCLtoignoremissingvaluesinmyplot?

21.HowcanIgetmorelabelsonmycontourlines?

22.MyXorYaxisvaluesarenotlinear.HowcanIchangethis?

23.HowdoIgetlogscalingoneitherofmyplotaxes?

24.HowdoIfillmycontourlevelswithvariousshadingpatternsand/orsolidcolors?

25.HowdoIoverlayacontourplot（oravector/streamlineplot）onamap?

26.HowdoIforcethetickmarkstopointinward?

27.I'mtryingtocontrolthetickmarksonthetoporrightaxis,andnothingishappening.

28.HowcanIimprovetheresolutionofmymapoutlines?

29.WhenIdrawamapusingthehigh-resolutionmapdatabase,Iseemtorandomlygetdifferentresolutions.

30.HowcanIgetmoregeographicaloutlinesinmymap,liketheprovincesofChina?

31.IfIamcreatingacolorcontourorvectorplot,howdoIselectmycolorssuchthattheyarespreadacrossmywholecolormap?

32.HowdoIgenerateawire-framesurfaceorisosurfaceplotinNCL?

33.HowdoIdrawweathersymbols（windbarbs,weatherfrontlines,highandlowpressureindicators,arrows,dots,weathericons,cloudsymbols,lightningbolts,etc.）onamap?

34.HowcanIhaveanewlineaspartofagraphicaltextstringinNCL?

35.HowcomeIgetdifferentlinethicknessesondifferentoutputdevicesusingthesamethicknessvalue?

36.HowcanIputatimestamponmyplot?

37.WhyamInotgettingthecolorIexpectwhenIreferenceanamedcolor?

38.WhyismylandnotbeingfilledinthecolorIexpect?

39.HowdoIsetupmyNCLscriptsothatitusesaresourcefile?

40.HowcanImoveandresizemylabelbarand/orlegend?

41.HowcanIsettheprecisionofthelabelbarlabels?

42.HowcanIgeneratesome"nice"2Drandomdataforacontourand/orvectorplot?

Arrayfunctions

1.HowdoIgetthedimensionsofanarray?

2.HowdoIcreateuniquerandomsubscripts?

3.HowdoIeliminatemissingvaluesfromaone-dimensionalarray?

4.HowdoIgenerateaone-dimensionalarrayofequally-spacedintegersorfloatingpointnumbers?

5.HowdoIfindorprinttheminimum/maximumvaluesofmydataarray?

Outputformats

1.HowdoIchangethedefaultNCGM/PostScript/PDFfilenametosomethingelse?

2.HowdoIconvertmyNCLgraphicsfiletoanotherformat,likePNG,toputontheweborinapresentation?

3.HowdoIremoveallthewhitespacefromanimage?

4.IsthereawaytomakethePostScriptfilesgeneratedbyNCLsmaller?

5.CanIproduceaPNGimagedirectlyfromNCL?

6.Isthereawaytoremovethe".000001."fromthePNGfilename?

7.HowcanItiltanNCLgraphic?

8.HowcanIconvertaseriesofPSorEPSfilestoananimation?

9.HowcanIproduceGoogleEarthkmzfiles?

10.HowdoIconvertmymulti-frameNCLgraphicsfiletoanMPEGmoviefile?

11.HowdoIincludeanencapsulatedPostScriptfilefromNCLinaLaTexdocument?

Errormessages

1.WhenIrunmyscript,I'mgettinga"fatal:

NclMallocFailed"errormessage.

2.WhenIrunNCL,Igetanerrormessageaboutbeingunabletoloadthe"SystemResourceFile".

3.WhenIrunNCL,IgetanerrormessageabouttheXdriver,like"erroropeningdisplay".

4.What'sthedealwiththeerrormessage"error:

line-1beforeornear..."?

5.HowcanIturnoffNCLwarningmessages?

6.I'mtryingtolistsomefiles,andgettinganerror"Argumentlisttoolong".

7.WhenItrytorunncl,Igetanerrorabout"libgfortr