Does Scalala provide straightforward way of inserting vector into matrix?

Question

I am a bit lost among all those available operators -- so is there easy way to insert a entire row/column (vector) into a matrix?

I started thinking about creating a vector, converting it to array, joining it with matrix converted into array, and creating new matrix based on such combined array, but it looks even uglier than it sounds.

Any reason you're still using scalala and not [breeze](https://github.com/scalanlp/breeze)? — dhg, Sep 16 '12 at 18:25
@dhg, "still"? I just started using it few days ago ;-). I didn't even find a word about breeze up till now. I will take a look, thank you. The question still holds than (for breeze as well). — greenoldman, Sep 16 '12 at 18:30

dhg · Accepted Answer · 2012-09-16T19:20:45.727

5

val m = DenseMatrix((1, 4, 10, 13), (2, 5, 11, 14), (3, 6, 12, 15))

val v = DenseVector(7, 8, 9)

val m2 = DenseMatrix.zeros[Int](3, 5)
m2(::, 0 to 1) := m(::, 0 to 1)
m2(::, 2) := v
m2(::, 3 to 4) := m(::, 2 to 3)

You'll find more information about basic breeze functionality here.

edited Sep 16 '12 at 19:20

answered Sep 16 '12 at 19:13

dhg

52,383
8
123
144

Thank you, also for nice way to initialize matrix, I didn't know about it. – greenoldman Sep 16 '12 at 19:18

Does Scalala provide straightforward way of inserting vector into matrix?

1 Answers1

Linked