Hi i'm a french medical student,
i have some data that i import from excel. My colomn of the datafram 
are the localisations of metastasis. If there is a metatsasis there is 
the symbol "_". i want to exclude the row without metastasis wich 
represent the NA data.

so, i wrote this

mela is the data fram

mela1=ifelse(mela[,c(11:12,14:21,23,24)]=="_",1,0) # selection of the 
colomn of metastasis localisation

mela4=subset(mela3,Skin ==0 & s.c == 0 & Mucosa ==0 & Soft.ti ==0 & 
Ln.peri==0 & Ln.med==0 & Ln.abdo==0 & Lung==0 & Liver==0 & 
Other.Visc==0 & Bone==0 & Marrow==0 & Brain==0 & Other==0) ## selection 
of the row with no metastasis localisation
nrow(mela4)

but i dont now if it is possible to make the same thin as 
ifelse(mela3,Skin & s.c== 0, 0,NA) with more than colomn and after to 
exclude of my data the Na with na.omit.

The last question is how can i omit only the row which are NA value for 
the colomn metastasis c(11:12,14:21,23,24))

Thank you for your help



Bertrand billemont
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