[R] Read many cvs files
jim holtman
jholtman at gmail.com
Wed Jan 2 18:07:20 CET 2013
use the XLConnect package to read/write Excel workbooks. It handles
multiple sheets just fine.
On Wed, Jan 2, 2013 at 12:03 PM, Yuan, Rebecca
<rebecca.yuan at bankofamerica.com> wrote:
> I know that R can read cvs file, but could R read excel files?
>
> For example, in the workbook, I have 3 sheets. How could I read for those three sheets?
>
> Thanks,
>
> Rebecca
>
>
> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of jim holtman
> Sent: Wednesday, January 02, 2013 11:58 AM
> To: Dominic Roye
> Cc: R help
> Subject: Re: [R] Read many cvs files
>
> You can read the files into a "list" -- you don't want to create unique object names for each one.
>
>
> files <- list.files(..pattern to match files..) results <- lapply(files, read.table, header = TRUE)
>
>
> On Wed, Jan 2, 2013 at 10:14 AM, Dominic Roye <dominic.roye at gmail.com> wrote:
>> Hello R helpers,
>>
>> I would like to automate this code for many files of the same type.
>> But I don´t know how to make it. In particular, i don´t know how to
>> read many files each one as an r object with the name of the file.
>> Then a for loop would be sufficient, right?
>>
>> Many thanks and a happy new year.
>>
>> Dominic
>>
>> datos <-
>> read.table('global2001.csv',head=T,sep=';',stringsAsFactors=F)
>>
>> datos[datos==""] <- NA
>>
>> temp <- datos[,19:53]
>>
>>
>> y <- split(temp,1:nrow(temp))
>> y2 <- lapply(y,function(x) paste(x[!is.na(x)],collapse=";"))
>>
>> global2001 <- datos[,-19:-53]
>>
>> global2001[1,"CODPA"] <- 1
>> global2001$CODPA <- y2
>> global2001$CODPA <- unlist(global2001$CODPA)
>>
>>
>>
>>
>>
>> Example of a file:
>>
>>> str(datos)
>> 'data.frame': 112598 obs. of 53 variables:
>> $ Identificación.do.Paciente : chr "34" "41" "42" "46" ...
>> $ Número.de.Historia : int 3024659 3028931 3030905 3033514
>> 3037754 3039062 3039851 3048020 3049659 3049659 ...
>> $ TSI : chr "580208NCEE0010"
>> "770802ROOR0019" "710720GEUS1015" "770319GLOO0011" ...
>> $ Identificador.interno.de.episodio: int 2001033879 2001042319
>> 2001036188
>> 2001030007 2001039108 2001041196 2001063540 2001031533 2001031565
>> 2001056967 ...
>> $ Ano.Alta : int 2001 2001 2001 2001 2001 2001
>> 2001 2001 2001 2001 ...
>> $ Data.Ingreso : chr "16/02/2001" "27/04/2001"
>> "09/03/2001" "18/01/2001" ...
>> $ Data.Alta : chr "20/02/2001" "30/04/2001"
>> "10/03/2001" "21/01/2001" ...
>> $ Sexo : chr " MULLER" " MULLER" "
>> HOME" " MULLER" ...
>> $ Idade.en.anos : int 43 23 29 23 48 27 80 42 42 42 ...
>> $ Código.Concello : int 15030 15092 15030 15030 15019
>> 15030 15032 15014 15005 15005 ...
>> $ Concello : chr "CORUÑA, A" "VIMIANZO" "CORUÑA,
>> A" "CORUÑA, A" ...
>> $ Hospital.abrev. : chr "A CORUÑA" "A CORUÑA" "A CORUÑA"
>> "A CORUÑA" ...
>> $ Motivo.de.Alta : chr "DESTINO A DOMICILIO" "DESTINO A
>> DOMICILIO" "DESTINO A DOMICILIO" "DESTINO A DOMICILIO" ...
>> $ Cód..Diagnóstico.Ppal.completo : chr "218.0 " "890.1 " "998.89" "650.
>> " ...
>> $ Diagnóstico.Ppal.completo : chr "LEIOMIOMA UTERINO SUBMUCOSO"
>> "HERIDA ABIERTA DE CADERA Y MUSLO-COMPLICADA" "OTRAS COMPLICACIONES
>> ESPECIFICADAS DE PROCEDIMIENTO" "PARTO NORMAL" ...
>> $ GRD : int 359 443 453 373 796 372 14 758
>> 450 450 ...
>> $ Descrición..do.GRD : chr "PROC. SOBRE ÚTERO E ANEXOS POR
>> CA.IN SITU E PROCESO NON MALIGNO SEN CC" "OUTROS PROCEDEMENTOS
>> CIRÚRXICOS POR LESIÓN TRAUMÁTICA SEN CC" "COMPLICACIÓNS DE TRATAMENTO
>> SEN CC" "PARTO SEN COMPLICACIÓNS" ...
>> $ Peso.GRD : num 1.098 0.948 0.601 0.58 3.846 ...
>> $ Lista.de.códigos.de.diagnóstico : chr "218.0" "890.1" "998.89" "650."
>> ...
>> $ X : chr "" "E986" "780.2" "V27.0" ...
>> $ X.1 : chr "" "" "780.4" "" ...
>> $ X.2 : chr "" "" "381.3" "" ...
>> $ X.3 : chr "" "" "" "" ...
>> $ X.4 : chr "" "" "" "" ...
>> $ X.5 : chr "" "" "" "" ...
>> $ X.6 : chr "" "" "" "" ...
>> $ X.7 : chr "" "" "" "" ...
>> $ X.8 : chr "" "" "" "" ...
>> $ X.9 : chr "" "" "" "" ...
>> $ X.10 : chr "" "" "" "" ...
>> $ X.11 : chr "" "" "" "" ...
>> $ X.12 : chr "" "" "" "" ...
>> $ X.13 : chr "" "" "" "" ...
>> $ X.14 : chr "" "" "" "" ...
>> $ X.15 : chr "" "" "" "" ...
>> $ X.16 : chr "" "" "" "" ...
>> $ X.17 : chr "" "" "" "" ...
>> $ X.18 : chr "" "" "" "" ...
>> $ X.19 : chr "" "" "" "" ...
>> $ X.20 : chr "" "" "" "" ...
>> $ X.21 : chr "" "" "" "" ...
>> $ X.22 : chr "" "" "" "" ...
>> $ X.23 : num NA NA NA NA NA NA NA NA NA NA ...
>> $ X.24 : chr "" "" "" "" ...
>> $ X.25 : chr "" "" "" "" ...
>> $ X.26 : num NA NA NA NA NA NA NA NA NA NA ...
>> $ X.27 : chr "" "" "" "" ...
>> $ X.28 : chr "" "" "" "" ...
>> $ X.29 : num NA NA NA NA NA NA NA NA NA NA ...
>> $ X.30 : num NA NA NA NA NA NA NA NA NA NA ...
>> $ X.31 : num NA NA NA NA NA NA NA NA NA NA ...
>> $ X.32 : num NA NA NA NA NA NA NA NA NA NA ...
>> $ X.33 : logi NA NA NA NA NA NA ...
>>>
>>
>> [[alternative HTML version deleted]]
>>
>>
>> ______________________________________________
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>>
>
>
>
> --
> Jim Holtman
> Data Munger Guru
>
> What is the problem that you are trying to solve?
> Tell me what you want to do, not how you want to do it.
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
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