Hi Although you did not present your data in suitable format I do not see any problem.
See in line > -----Original Message----- > From: R-help [mailto:r-help-boun...@r-project.org] On Behalf Of Stefano > Sofia > Sent: Wednesday, September 7, 2016 1:09 PM > To: r-help@r-project.org > Subject: [R] how to manage missing values correctly when importing a data > frame > > Dear R users, > I have a data frame with 22 columns, called Storia_RM_RT. Here the first 4 > rows: > > Station_RM Sensor_RM Place_RM Y_init_RM M_init_RM D_init_RM > Long_cent_RM Lat_cent_RM Height_RM Continues Station_RT Sensor_RT > Place_RT Name1_RT Name2_RT Long_cent_RT Lat_cent_RT Height_RT > Actual_net Notes Test_20141231 Test_20151231 > 1400 2701 Novafeltria 1959 1 1 12.289552 43.890057 293 NO NA NA NA NA NA > NA NA NA CAE NA NO NO > 1460 2702 Carpegna 1963 1 1 12.332614 43.778107 748 SI 702 2954 Carpegna > Carpegna Carpegna 12.340618 43.780575 715 RT NA NO NO > 1500 2703 Pesaro 1957 1 1 12.909822 43.910889 11 SI 112 1229 Pesaro > Villa_Fastiggi Villa_Fastiggi 12.86939 43.890610 22 RT NA YES YES > 1520 2704 Fano 1957 1 1 13.017591 43.840054 4 SI 152 2671 Fano > Foce_Metauro Metaurilia 13.053796 43.826328 7.12 RT NA YES YES > > I load it with > Storia_RM_RT <- read.table(file="Storia_RM_RT.txt", header = TRUE, sep=" > ", dec = ".", stringsAsFactors = FALSE) > > print(Storia_RM_RT$Test_20151231[Storia_RM_RT$Station_RM == 1500]) > gives [1] "YES" So you have unique value here > > while > print(Storia_RM_RT$Omogenea_20151231[Storia_RM_RT$Station_RT == > 112]) gives > [1] NA "YES" and two values here, one is NA see dat<-data.frame(x1=c("a", "a", "b", NA), x2=c(1,2,3,3)) dat$x1<-as.character(dat$x1) > dat$x1[dat$x2==1] [1] "a" > dat$x1[dat$x2==2] [1] "a" > dat$x1[dat$x2==3] [1] "b" NA > You should consult R intro to understand basic object types, their distinctions and language basics. Cheers Petr > > > print(lapply(Storia_RM_RT, class)) gives > > $Station_RM > [1] "integer" > > $Sensor_RM > [1] "integer" > > $Place_RM > [1] "character" > > $Y_init_RM > [1] "integer" > > $M_init_RM > [1] "integer" > > $D_init_RM > [1] "integer" > > $Long_cent_RM > [1] "numeric" > > $Lat_cent_RM > [1] "numeric" > > $Height_RM > [1] "integer" > > $Continues > [1] "character" > > $Station_RT > [1] "integer" > > $Sensor_RT > [1] "integer" > > $Place_RT > [1] "character" > > $Name1_RT > [1] "character" > > $Name2_RT > [1] "character" > > $Long_cent_RT > [1] "numeric" > > $Lat_cent_RT > [1] "numeric" > $Quota_RT > [1] "numeric" > > $Actual_net > [1] "character" > > $Notes > [1] "logical" > > $Test_20141231 > [1] "character" > > $Test_20151231 > [1] "character" > > I am struggling to understand why the query through the field Station_RT > does not work. > Could please somebody help me to manage correctly the missing values? Is > the mistake somewhere else? > > Thank you > Stefano Sofia > > > ________________________________ > > AVVISO IMPORTANTE: Questo messaggio di posta elettronica può contenere > informazioni confidenziali, pertanto è destinato solo a persone autorizzate > alla ricezione. I messaggi di posta elettronica per i client di Regione Marche > possono contenere informazioni confidenziali e con privilegi legali. Se non > si è > il destinatario specificato, non leggere, copiare, inoltrare o archiviare > questo > messaggio. Se si è ricevuto questo messaggio per errore, inoltrarlo al > mittente ed eliminarlo completamente dal sistema del proprio computer. 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