st: A matrix computation question

[chen jie <uuphd2002@yahoo.com.cn>]

Dear Statalists:

I wonder how we can achieve this in stata: 

conditional on a given matrix A, obtain a matrix B
that has the property of BA=0.

For example: 
a (3x1) vector
A=
1
0.1
0.1

Thanks for any help!

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