Hi Sofia!

You need to attach the data file before sorting:

attach(df_final)

or just use full qualified names (like df_final$Y_init)

Dmitry

On 03/01/2014 16:41, Stefano Sofia wrote:
> Dear R users,
> I have two files of seasonal rainfall data (more than 10,000 rows each); here the first 8 rows of each file are reported.
>
> Code_Raingouge,Y_init,M_init,D_init,h_init,m_init,Y_fin,M_fin,D_fin,h_fin,m_fin,Rainfall,N_Values,Quality_Level,Code_Station
> 2000,1952,12,1,0,0,1953,3,1,0,0,307.20,90,100.0,1510
> 2000,1953,3,1,0,0,1953,6,1,0,0,153.60,92,100.0,1510
> 2000,1953,6,1,0,0,1953,9,1,0,0,181.00,92,100.0,1510
> 2000,1953,9,1,0,0,1953,12,1,0,0,202.40,91,100.0,1510
> 2000,1953,12,1,0,0,1954,3,1,0,0,153.80,90,100.0,1510
> 2000,1954,3,1,0,0,1954,6,1,0,0,286.20,92,100.0,1510
> 2000,1954,6,1,0,0,1954,9,1,0,0,142.80,92,100.0,1510
> 2000,1954,9,1,0,0,1954,12,1,0,0,186.60,91,100.0,1510
> ...
>
> Code_Raingouge,Y_init,M_init,D_init,h_init,m_init,Y_fin,M_fin,D_fin,h_fin,m_fin,Rainfall,N_Values,Quality_Level,Code_Station
> 1056,2004,12,1,0,0,2005,3,1,0,0,93.60,2833,32.8,15
> 1056,2005,3,1,0,0,2005,6,1,0,0,149.80,4406,49.9,15
> 1056,2005,6,1,0,0,2005,9,1,0,0,52.80,1440,16.3,15
> 1056,2005,9,1,0,0,2005,12,1,0,0,191.80,1201,13.7,15
> 1056,2005,12,1,0,0,2006,3,1,0,0,26.40,336,3.9,15
> 1056,2006,12,1,0,0,2007,3,1,0,0,59.00,3604,41.7,15
> 1056,2007,3,1,0,0,2007,6,1,0,0,181.16,4414,50.0,15
> 1056,2007,6,1,0,0,2007,9,1,0,0,96.00,7337,83.1,15
> ...
>
> I have to load them as data frames, to merge them and sort them by (Y_init,M_init,D_init,Code_Raingouge).
>
> I wrote a short function where I first load the two files as data frames
>
> df_1 <- read.csv(file="prec_all_19521201_19821201.csv", sep=",")
> df_2 <- read.csv(file="prec_all_19821201_20111201.csv", sep=",")
>
> then I merge them by
>
> df_final <- merge(df_1, df_2, all=TRUE)
>
> and finally I try to order df_final through
>
> df_final <- df_final[order(Y_init, M_init, D_init, Code_Raingouge), ]
>
> but this returns only the first row.
>
> I read the manual carefully and I saw some examples, but I have not been able to do this simple task.
> I spent quite a long time and now I decided to ask the list.
> Could please somebody help me to show me where the mistake is?
>
> Thank you
> Stefano
>
>
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