Can BITWISE_XOR be added. Thanks.

[Janardhan Pulivarthi]

Hi all,

I am using the following line code operation
`
x_tmp = bitwise_xor( v_index, as.scalar(V[v_index,]) )
`
Can this `bitwise_xor` be added?. I will try to take up the task, if there
it fits into dml.

Thanks,
Janardhan