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Why does 'apply(.., 1, .., ..)' transpose result
2 messages · Worik R, Charles C. Berry
On Fri, 23 Apr 2010, Worik R wrote:
I am sorry if this is documented in apply's dcumentation or completely obvious, I could not find or work it out.
Well, try ?apply and focus on the 'Value:' section, first para. To me, that behavior seems consistent with other functions in the [tslm]apply family. Perhaps you want sweep(). See ?sweep HTH, Chuck
Given an matricies Q: 2x3, R:1x3 and S:1x2 apply(Q, 1, '-', R) is 3x2 and apply(Q, 2, '-', S) is 2x3 Why? cheers Worik
Q
[,1] [,2] [,3] [1,] 1 2 3 [2,] 10 11 12
R
[1] 1 4 7
S
[1] 1 4
apply(Q, 1, '-', R)
[,1] [,2] [1,] 0 9 [2,] -2 7 [3,] -4 5
apply(Q, 2, '-', S)
[,1] [,2] [,3] [1,] 0 1 2 [2,] 6 7 8
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Charles C. Berry (858) 534-2098
Dept of Family/Preventive Medicine
E mailto:cberry at tajo.ucsd.edu UC San Diego
http://famprevmed.ucsd.edu/faculty/cberry/ La Jolla, San Diego 92093-0901