[R] R Error : DATA to MATRIX

[Petr PIKAL]

> 
> On similar lines, how do I assign the position of the an occurence of a 
> value say 7 in a data vector to another data vector?
>  
> > nFields
>  [1] 6 6 6 6 6 6 7 7 6 6 6 7 6 6 6 6
> I need the output data vector showing occurence of 7 as:
> [1] 7 8 12

which(nFields==7)

Regards
Petr


>  
> I tried following but both has errors
> xFields7 <- NULL
> for (i in 1:length(nFields)) {
>  c(xFields7,ifelse(nFields[i] == 7,i,NULL)) -> xFields7 
> }
>  
> xFields7 <- NULL
> for (i in 1:length(nFields)) {
>  if nFields[i] == 7 then c(xFields7,i) -> xFields7 
> }
> 
>