r - How to deal with "non-conformable" arrays? -



r - How to deal with "non-conformable" arrays? -

how 1 element-wise arithmetic operations 2 arrays conformable in first dimensions 1 has dimension?

example, multiply array a (3 x 3 x 2) array b (3 x 3):

a <- array(1:18, dim=c(3,3,2)) b <- diag(3)

the next fails because arrays non-conformable.

> * b

for work, have cast array b array right number of dimensions.

> * array(b, dim=c(3,3,2))

this doesn't strike me beingness straightforward , i'm sure there must simpler way.

you can try:

a * c(b)

c strip attributes, allow recycling of b simple vector , lead believe desired outcome:

, , 1 [,1] [,2] [,3] [1,] 1 0 0 [2,] 0 5 0 [3,] 0 0 9 , , 2 [,1] [,2] [,3] [1,] 10 0 0 [2,] 0 14 0 [3,] 0 0 18

arrays r multidimensional-array

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