CODEWITHSUNDEEP
scalamatrixlinear-algebrascala-breeze
Soumya Simanta
Soumya Simanta

Reputation: 11741

Matrix Row manipulation in Breeze using Scala?

I've a 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 to remove the first row and then a last row with all 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 do I achieve this in Breeze ?

Upvotes: 1

Views: 947

Answers (1)

Reactormonk
Reactormonk

Reputation: 21690

First, gather the rows you still want:

val subset = matrix(::, 2 to 3)

then add the zeroes:

val newMatrix = DenseMatrix.horzcat(subset, DenseMatrix.zeros[Double](1,9))

I might have mixed up rows and columns in the last line.

Upvotes: 3

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