iterate through densematrix with index

[Tamas Jambor]

Hi all,

I would like to run some operation on a DenseMatrix row-wise, I understand that I can use the syntax w[*, ::].map{l => l} where I have access to row vectors in the map. 

Just wondering if it is possible to get the index of the row accessible in the map somehow.

Thanks,

[David Hall]

that's not really available right now, sorry :(

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[Tamas Jambor]

thanks for the reply. 

can I maybe wrap the broadcaster to an iterator to use with zipwithindex?

[David Hall]

oh sure, if you just want to iterate (and not preserve the matrix structure), then i think there's iterator

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[Tamas Jambor]

I would like to iterate through the rows, but couldn't find the way to wrap that with a zipWithIndex. it doesn't look like that BroadcastedRows provides an iterator. 

[Daniel Korzekwa]

Yeah, I need the same quite a lot. Currently I use something like this

(0 until m.rows).foreach/map{rowIndex =>

val row = m(rowIndex,::)

...

}

similarly things like filter rows, sort matrix by would help.