JPhrases/MatrixAlgebra

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9A. Matrix Algebra

m0=: I=: =@i.@# Identity matrix of order of y
m1=: inv=: %. Matrix inverse
d2=: mq=: %. Matrix quotient
d3=: mp=: +/ . * Matrix product
d4=: amp=: -/ . * Alternating matrix product
m5=: det=: -/ . * Determinant
d6=: fit=: {:@] %. {.@] ^/ i.@[ d fit x,:f x is coeffs of pn fit of degree d-1