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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

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