The above code gives tau only. I am satisfied with this answer. Thank you very much for the answer.  But all values of tau are coming in a column. I want them in row format separeted by comma. for example 

-0.9785051795 + 0.7259062748 I, -1.071478821 + 0.6845304376 I, -1.131874061 + 0.6560618230 I,
  -1.175633397 + 0.6345196708 I, -1.207468201 + 0.6181877729 I,-1.229655595 + 0.6060305422 I

Please help me to get the answer. 

The above code gives tau only. I am satisfied with this answer. Thank you very much for the answer.  But all values of tau are coming in a column. I want them in row format separeted by comma. for example 

-0.9785051795 + 0.7259062748 I, -1.071478821 + 0.6845304376 I, -1.131874061 + 0.6560618230 I,
  -1.175633397 + 0.6345196708 I, -1.207468201 + 0.6181877729 I,-1.229655595 + 0.6060305422 I

Please help me to get the answer. 

yes, it works good.

yes, it works good.