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