[R] cbind with vectors of different lengths?

[Arantzazu Blanco Bernardeau]

Hello R help
I have a dataframe, with 71 samples (rows) and 30 variables. I got linear models for some of the variables,  and I want to join fitted and residuals of these models to the data frame. Sometimes, these vectors have the same length of the dependant variable, but in a few cases, NA values can be found on my data, and therefore, both fitted and residuals have a few rows less than the original data frame. As I try cbind, R answers with error, because both vectors have different lenghts. I have tried with merge but... suddenly  I had a lot of rows of repeated values. I think (with my small idea of R and the manuals and helps I did read) that first, I have to force residuals and fitted of my model to be a data frame.
>as.data.frame(fitted(lm))
this gives, for example
[1] 1.1


[3] 3.8


[4] 1.3

[5] 0.9

instead of the original fitted(lm)
1        3       4          5
1.1     3.8     1.3      0.9


that I want to join to my data frame
[1] 17.0
[2] 15.2


[3] 17.3


[4] 15.0

[5] 17.4  
as you can see, row 2 does not exist in fitted... how can I tell R to leave this row as NA, as below?

[1] 17.0    1.1

[2] 15.2    NA



[3] 17.3    3.8



[4] 15.0    1.3


[5] 17.4    0.9  
thanks and greets.
Arantzazu Blanco Bernardeau
Dpto de Química Agrícola, Geología y Edafología
Universidad de Murcia-Campus de Espinardo
 		 	   		  
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