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...my problem, because perhaps I shouldn't be using aperm at all. The context is probabilistic inference in graphical models. One of the most fundamental operations is two compute an element-wise multiplication of two arrays of different sizes, say A and B. This is illustrated below. for (i in 1:Asz[1]) { for (j in 1:Asz[2]) { for (k in 1:Asz[3]) { C[i,j,k] <- A[i,j,k] * B[i,k] } } } Here, the "domain" of A is [X1 X2 X3] and the domain of B is [X1 X3], which is why we write A[i,j,k,l] * B[i,k]. (Asz = dim(A).) In general, we can implement this by making B the...

...st encountered a serious problem with rsync. I used rsync to copy a big directory between two computers. The source machine was a sun, the destination was a linux box. The destination directory did not exist before the copy started. I used the following command to copy the directory over: rsync -aSz source_machine:projects/ projects2 because I was somewhat paranoid, I checked if all files were transferred correctly using the following command: find . -not -type d -exec cksum \{\} \; |sort +2 >/tmp/w which was issued on both the source and the destination machines. Then I used 'diff -b...

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