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Here are the ways to get a submatrix of a matrix.

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• submatrix' -- exclude rows and/or columns of a matrix
• submatrixByDegrees -- submatrix consisting of rows and columns in an interval or box of degrees
• submatrix(Matrix,VisibleList) -- select columns
• submatrix(Matrix,VisibleList,VisibleList) -- see submatrix -- select part of a matrix
• Matrix _ List -- select columns
• Matrix ^ List -- select rows
• Matrix _ Array -- component of map corresponding to summand of source
• Matrix ^ Array -- component of map corresponding to summand of target

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