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  • $\begingroup$ First of all, thank you for your contribution. I have edited the post and explained I little better what I'm calculating. The problem is for m>5 we got imaginary values to datMK. $\endgroup$ Commented Jan 29, 2022 at 20:41
  • $\begingroup$ In summary, you suggestion works pretty well and is faster than two loops to constructing the matrices. So, for the proposite of this Question it is well done. But I got other problem with eigenvalues in which maybe I should open another question... $\endgroup$ Commented Jan 29, 2022 at 20:48
  • $\begingroup$ You're welcome. And indeed, a new thread would be better. $\endgroup$ Commented Jan 29, 2022 at 20:51
  • $\begingroup$ Should I call Needs["Developer`"] to use this recourse? $\endgroup$ Commented Jan 29, 2022 at 23:55
  • 1
    $\begingroup$ Not necessary. The "Developer`" context should be already present right from the start of the kernel. $\endgroup$ Commented Jan 30, 2022 at 0:55