Suppose I have the following matrix
> class(cov_50)
[1] "matrix"
> cov_50
[,1] [,2]
[1,] 0.3201992 2.308084
[2,] 6.7312928 5.719641
I then use the following function via apply and get the desired output, a list
signif <- function(x) which(abs(x) > 1.96)
apply(cov_50, 1, signif)
> apply(cov_50, 1, signif)
[[1]]
[1] 2
[[2]]
[1] 1 2
However, I can't see why the following occurs
> class(cov_25)
[1] "matrix"
> cov_25
[,1] [,2]
[1,] 12.116106 14.81248
[2,] 5.492176 4.73138
> apply(cov_25, 1, signif)
[,1] [,2]
[1,] 1 1
[2,] 2 2
So, using the same function (signif) on a different object of the same class
yields a matrix and *not* a list as desired.
I can't see any reason for the different output.
> sessionInfo()
R version 2.12.2 (2011-02-25)
Platform: x86_64-pc-mingw32/x64 (64-bit)
locale:
[1] LC_COLLATE=English_United States.1252 LC_CTYPE=English_United States.1252
[3] LC_MONETARY=English_United States.1252 LC_NUMERIC=C
[5] LC_TIME=English_United States.1252
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] quantreg_4.57 SparseM_0.86
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