Data frame Q

Hi

Your question is without reproducible example and I find it a bit cryptic. You do not uncover what is i. If it is a number I wonder why your atempts fail.

Find answer in line below.

-----Original Message-----
From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Ragia
Ibrahim
Sent: Monday, August 10, 2015 6:42 AM
To: r-help at r-project.org
Subject: [R] Data frame Q

Dear Group,
Kindly,
 I have the following

Common_Friends <-
intersect(node_neighbours_i_out,node_neighbours_j_out)
         class(Common_Friends)
         print(Common_Friends)
         #4 = Common_Friends
       newline<-c(i,   Common_Friends  )
 df<- rbind(df,newline)

I created a data frame to add the new line

when   Common_Friends  =0 nothing add ?, how to force it to write the
value into the data frame


Common_Friends <-
intersect(node_neighbours_i_out,node_neighbours_j_out)

         class(Common_Friends)

[1] "numeric"

         print(Common_Friends)

numeric(0)

Common_Friends is not 0 but an empty vector.

       newline<-c(i,   Common_Friends  )
newline

dat<-data.frame(a=1:4, b=rnorm(4))
b<-numeric(length = 0)

length(c(5,b))

[1] 1

rbind(dat, c(5,b))

a          b
1 1 -0.7346253
2 2  0.2063677
3 3  0.8580852
4 4 -0.4844313
5 5  5.0000000

so there is 5th line added but as b is empty vector the length of newline is one and recycling rule applies. If you want add zero you have to declare it as a zero (or NA) and not as an empty vector e.g.

if(length(cf)==0) cf<-0
cf

[1] 0

Cheers
Petr

[1] 5
thanks in advance
Ragia


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