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May 31, 2014 at 8:51 vote accept jaraujo
May 31, 2014 at 8:51 comment added jaraujo thanks. I managed to get the answer in the meantime and is similar to the one that you gave me. In my case I actually also needed that T to be with the least amount of zero elements possible. I managed to do that by using an heuristic for rank constrained optimization to find an appropriate X for that to happen.
May 29, 2014 at 16:25 history answered zeraoulia rafik CC BY-SA 3.0