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Say your function in sapply returns a matrix with a variable number of rows. For example
ff <- function( i ) matrix( i, ncol= 3, nrow= i ) pipa <- sapply( 1:3, , simplify= "array" )
sapply is too stupid to see the pattern here (or maybe I don’t know how to cast the return value into an appropriate shape…). The result of the above is a list:
[[1]]
[,1] [,2] [,3]
[1,] 1 1 1
[[2]]
[,1] [,2] [,3]
[1,] 2 2 2
[2,] 2 2 2
[[3]]
[,1] [,2] [,3]
[1,] 3 3 3
[2,] 3 3 3
[3,] 3 3 3
However, we can turn this list of matrices into a simple matrix using Reduce:
pipa <- Reduce( function( ... ) rbind( ... ), pipa )
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