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Reference.org
Interpolative decomposition
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<p>In <a href="/facts/Numerical_analysis/QT9cYa9z">numerical analysis</a>, interpolative decomposition (ID) factors a <a href="/facts/Matrix_(mathematics)/qa8FI4ko">matrix</a> as the product of two matrices, one of which contains selected columns from the original matrix, and the other of which has a subset of columns consisting of the <a href="/facts/Identity_matrix/Glbcf6ol">identity matrix</a> and all its values are no greater than 2 in absolute value. </p>