Feature #10073 » update_news.patch
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by deleting the specified row and column.
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* Matrix#cofactor(row, column) returns the (row, column) cofactor
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which is obtained by multiplying the first minor by (-1)**(row + column).
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* Matrix#laplace_expansion(row_or_column: num) returns the laplace_expansion
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along +num+ -th +row_or_column+.
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* Method
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* New methods:
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