Re: [R] request: How can we ignore a component of list having no element

[Adaikalavan Ramasamy]

Try
        x[ !sapply(x, is.null) ]


hadley wickham wrote:

An alternative approach would be to store 0 x 0 matrices instead of
NULLs.  This way every object in your list is a consistent type.

Hadley

On Wed, Oct 15, 2008 at 5:23 AM, Muhammad Azam <[EMAIL PROTECTED]> wrote:

Dear friends
There is a list of arrays comprising different no of rows and columns even 
sometimes NULL, such as [[2]] given below. How can we ignore [[2]] or others 
like this in the complete list. Any help in this regard is needed. Thanks

[[1]]
      [,1] [,2]
[1,]    3    1
[2,]    3    1
[3,]    3    1

[[2]]
NULL

[[3]]
       [,1] [,2] [,3] [,4] [,5] [,6] [,7]
 [1,]    3    1    0    0    0    0    0
 [2,]    3    1    0    0    0    0    0
 [3,]    3    1    0    0    0    0    0
 [4,]    3    1    3    1    3    2    1
 [5,]    3    1    3    1    3    2    1
 [6,]    3    1    3    1    3    2    0

[[4]]
      [,1] [,2] [,3] [,4]
[1,]    3    0    0    0
[2,]    3    1    3    3
[3,]    3    1    3    3
[4,]    3    1    3    0

OR
x1=c(1,2,3); x2=c(1,2,3,4,6); x3=c(); x=list(x1,x2,x3)

M.Azam



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