ddply drops all but the first matrix column from AsIs elements of the data frame

[cubranic]

Check the behaviour of the following code on plyr 1.7.1 vs. 1.8:

df <- data.frame(a = sample(letters[1:2], 6, TRUE), b = I(matrix(1:18, 6)))
str(df) # column 'b' has dimension 6x3 

# post 1.7.1, column 'b' in each split contains only the first column of the original 'b' matrix
ddply(df, .(a), str)

[hadley]

plyr is unlikely to support matrices in columns in general, unfortunately. dplyr might do better.

[cubranic]

It used to, though. You don't think this is a regression introduced in 1.8?

On 2014-01-02, at 1:16 PM, Hadley Wickham wrote:

plyr is unlikely to support matrices in columns in general, unfortunately. dplyr might do better.

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[hadley]

It would be a regression if I'd planned for it to work in the first place ;) It's also possible some of the rbind.fill() improvements coming down the line might fix this.