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...Notes on matrix calculus paul l fackler north carolina state university september is concerned with rules for operating functions of matrices example suppose that an m n x mapped into a p q y we are interested in obtaining expressions derivatives such as yij xkl all i j and k the main diculty here keeping track where things put there no reason to use subscripts it far better instead system ordering results using operations makes heavy vec operator kronecker products vectorizes by stacking its columns convention column rather than row used vectorizing associate professor department agricultural re source economics at these copyrighted mate rial they may be freely copied individual but should appropriated referenced published work mail resource ncsu box raleigh nc usa e edu c web site http www pfackler produces product two b dened mn which mp nq important relationship between axb this extremely useful deriving another will prove one related dene tm transforms t note size has number speci...