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Math Help - Extract part of a matrix

  1. #1
    Junior Member
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    Extract part of a matrix

    Hi.

    Does anyone know a way to extract just part of a matrix, say one or two rows?

    One example of what I'm looking for would be:
    Enter a 2x3 matrix which represents a system of 2 eq. and 2 vars. Run rref([A]) on it.

    Now, I want to use the last column of the answer, and I want to multiply it by the first two columns of [A] (yes, I know I'll get the third column of [A] - this is just an example). Is there an easy way to extract column 3? Is there a way to extract the 2x2 matrix in the top right of [A]?

    Thanks.
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  2. #2
    Junior Member RHandford's Avatar
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    Hi,
    To continue your example the data that you require may be extracted as follows:

    subMat(A,1,2,3,3)

    This may be saved in a variable or used directly.
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  3. #3
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    Quote Originally Posted by RHandford View Post
    Hi,
    To continue your example the data that you require may be extracted as follows:

    subMat(A,1,2,3,3)

    This may be saved in a variable or used directly.
    Thanks, RH.

    To be a little clearer, I am using a TI-84+ silver. I don't see a subMat( command in the Catalog.
    Sorry I wasn't more specific (no wonder so few people answered an easy question).
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