Filtering matrix with a bit vector doesn't work

[Daniel Korzekwa]

val v = DenseVector(1d, 2d, 3d)

val filteredV = v(v :> 2d) //works fine

    

val d = DenseMatrix(1d,2d,3d)

val filteredD = d(d(::,0) :>2d,::) //compilation error

The use case here is to filter matrix by some column. Currently, first I use findAll on a particular column and then I filter matrix like this(see below), but the above would be more compact.

val idx = d.filterAll(x => x>2)

d(idx,::)

Ideally I would like to filter matrix by row like this: 

m.filterByRow(row => ....)

also getting matrix iterator with index like m.mapPair((index,row) => ....) would be useful

[David Hall]

please open an issue on github

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[Daniel Korzekwa]

issue created: https://github.com/scalanlp/breeze/issues/506