null function

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Dan Parrish
Dan Parrish 2011 年 7 月 26 日
How does the null function work ? When I row-reduce as a method of finding eigenvectors, I sometimes get a very different answer from what the null function produces.

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Walter Roberson
Walter Roberson 2011 年 7 月 27 日
http://www.mathworks.com/help/techdoc/ref/null.html
Z = null(A) is an orthonormal basis for the null space of A obtained from the singular value decomposition. That is, A*Z has negligible elements, size(Z,2) is the nullity of A, and Z'*Z = I

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