Matrix Row manipulation in Breeze using Scala? -

i've densematrix

1  2  3  0   0   0   0    0    0     0  0  0  11  22  33  0    0    0     0  0  0  0   0   0   111  222  333

i want remove first row , last row 0s

0  0  0  11  22  33  0    0    0     0  0  0  0   0   0   111  222  333  0  0  0  0   0   0   0    0    0

how achieve in breeze ?

first, gather rows still want:

val subset = matrix(::, 2 3)

then add zeroes:

val newmatrix = densematrix.horzcat(subset, densematrix.zeros[double](1,9))

i might have mixed rows , columns in last line.

HR