Thread: inverse matrix

  1. #1
    Registered User
    Join Date
    Sep 2005

    inverse matrix

    Hello all:

    My work comes across matrix operation in C++. The rows m and columns n of the matrix m*n usually as big as 10 t0 30.

    The major question is after defining the matrix A, I need to know the inverse matrix A-1('-1' is superscript)

    Who knows the program or way for obtaining inverse matrix?


  2. #2
    Absent Minded Programmer
    Join Date
    May 2005
    Lol, I learned that formula last year in Algebra II, and now i forget, sorry

  3. #3
    & the hat of GPL slaying Thantos's Avatar
    Join Date
    Sep 2001
    5,681 (thanks dave ) explains a method for finding an inverse matrix. Basically for this you'll just have to work it out on paper for a NxN matrix and then write a program to do that.

    A method that *might* be easier to implement is:
    A(-1) = (1/det A) adj(A)
    Where adj(A) =
    [C11 C12 ... C1n]
    [C21 C22 ... C2n]
    [... ... ... ...]
    [Cn1 Cn2 ... Cnn]
    Where Cnn is the cofactor of Ann

    That process requires for total calculations but is pretty simple to implement.

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