breeze-slices.scala

val _10 = Stream.from(1).take(10)
val data = Stream.continually(_10).take(10).flatten.toArray

// Exiting paste mode, now interpreting.

_10: scala.collection.immutable.Stream[Int] = Stream(1, 2, 3, 4, 5, 6, 7, 8, 9, 10)
data: Array[Int] = Array(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10)

scala> :paste
// Entering paste mode (ctrl-D to finish)

val mat = new DenseMatrix(rows = 10, data, offset = 0).t

// Exiting paste mode, now interpreting.

mat: breeze.linalg.DenseMatrix[Int] = 
1  2  3  4  5  6  7  8  9  10  
1  2  3  4  5  6  7  8  9  10  
1  2  3  4  5  6  7  8  9  10  
1  2  3  4  5  6  7  8  9  10  
1  2  3  4  5  6  7  8  9  10  
1  2  3  4  5  6  7  8  9  10  
1  2  3  4  5  6  7  8  9  10  
1  2  3  4  5  6  7  8  9  10  
1  2  3  4  5  6  7  8  9  10  
1  2  3  4  5  6  7  8  9  10  

scala> :paste
// Entering paste mode (ctrl-D to finish)

val area = mat(3 until 6, 2 until 7)

// Exiting paste mode, now interpreting.

area: breeze.linalg.DenseMatrix[Int] = 
3  4  5  6  7  
3  4  5  6  7  
3  4  5  6  7  

scala> :paste
// Entering paste mode (ctrl-D to finish)

area(1 until area.rows, 0 until area.cols)

// Exiting paste mode, now interpreting.

res17: breeze.linalg.DenseMatrix[Int] = 
8  9  10  1  2  
8  9  10  1  2  

bug, sorry, we'll get it fixed.