`SparseplusLowRank`

object
create an object of class `SparseplusLowRank`

which can be
efficiently stored and for which efficient linear algebra operations are possible.

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`x` |
sparse matrix with dimension say m x n |

`a` |
matrix with m rows and number of columns r less than |

`b` |
matrix with n rows and number of columns r less than |

an object of S4 class `SparseplusLowRank`

is returned with slots
`x`

, `a`

and `b`

Trevor Hastie

`SparseplusLowRank-class`

, `softImpute`

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