Hi Saba,
Try this:

df<-matrix(c(0,NA,0,0,0,1,1,1,0,0,1,0,0,0,NA),nrow=3)
dimdf<-dim(df)
df1<-df==1
df[cbind(rep(FALSE,dimdf[1]),df1[,-dimdf[2]])]<-1

Jim



On Fri, Sep 23, 2016 at 12:27 PM, Saba Sehrish via R-help
<r-help@r-project.org> wrote:
> Hi
>
> I have a matrix that contains 1565 rows and 132 columns. All the observations 
> are either "0" or "1". Now I want to keep all the observations same but just 
> one change, i.e. whenever there is "1", the very next value in the same row 
> should become "1". Please see below as a sample:
>
>>df
>
>      0    0    1    0    0
>     NA    0    1    1    0
>      0    1    0    0    NA
>
> What I want is:
>
>
>     0    0    1    1    0
>    NA    0    1    1    1
>     0    1    1    0    NA
>
>
>
> I shall be thankful for the reply.
>
>
> Saba
>
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