R Matrix Multiplication -


i have list, r=

[[1]]      [,1] [,2] [1,]  100    0 [2,]    0  100  [[2]]              [,1]       [,2] [1,] 0.0006364031  0.2521204 [2,] 0.2521204236 99.9993643`

i'm suppose f %*% r

         f [1,] 1 -6.264917e-04 [2,] 1  1.575666e-04

as in f[1,] matrix multiplied r[[1]], f[2,] matrix multiplied r[[2]]

how should go bout doing that?

sorry. think misunderstood. want f[1,]%*%r[[1]]%*%t(f[1,]) , f[2,]%*%r[[2]]%*%t(f[2,]) @sven hohenstein

mapply("%*%", as.data.frame(t(f)), r, simplify = false)  $v1      [,1]        [,2] [1,]  100 -0.06264917  $v2              [,1]     [,2] [1,] 0.0006761289 0.267877

update

to answer second question:

lapply(r, function(x) f %*% x %*% t(f))  [[1]]           [,1]      [,2] [1,] 100.00004  99.99999 [2,]  99.99999 100.00000  [[2]]              [,1]         [,2] [1,] 0.0003597493 0.0005083061 [2,] 0.0005083062 0.0007183373

update

to answer updated question:

mapply(function(x, y) y %*% x %*% as.matrix(y), r, as.data.frame(t(f)),         simplify = false)  [[1]]      [,1] [1,]  100  [[2]]              [,1] [1,] 0.0007183373

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