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Orthonormal basis for range of matrix

`Q = orth(A)`

`orth`

is obtained from `U`

in
the singular value decomposition, `[U,S] = svd(A,'econ')`

.
If `r = rank(A)`

, the first `r`

columns
of `U`

form an orthonormal basis for the range of `A`

.

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