>> pkg load control
>> q=tf([  -1.46668928632582  38.5234944088261  -1023.42433722006  18055.8729050165  -275471.128598611  3680685.32154243  -40413629.6869944  433109318.542883  -3699840188.09672  32827566143.7738  -225798332168.488  1689921426466.71  -9494747382069.7  60613579740811.5  -278626623858487  1.52747193482069e+15  -5.6883783399098e+15  2.69067309068308e+16  -7.92226372994905e+16  3.25360727881732e+17  -7.2059792475876e+17  2.61175754638012e+18  -3.8909506684981e+18  1.31637705830625e+19  -9.12640045084024e+18  3.78290213329238e+19  1.41630594163597e+19  5.02932079881115e+19  1.29547036349465e+20  1.05983336007477e+19  2.43633391646665e+20  -1.31208497581345e+19  1.04713601706961e+20  7.83465823853832e+18  ],[  1  17.1698120499521  542.934121038049  7294.98595152311  126155.971925398  1377306.37948524  16829405.6386297  152789570.438515  1448656865.6342  11095921096.5808  85365123037.7488  556372911296.259  3555399791580.02  19799716986834.5  106353561602035  506292672690482  2.29624277698132e+15  9.31618125768562e+15  3.56349262092232e+16  1.22398996473335e+17  3.92373264437545e+17  1.12860046096021e+18  2.99632129507514e+18  7.09934073973815e+18  1.53176948230893e+19  2.91760427412351e+19  4.97010301791734e+19  7.33491370510952e+19  9.42777562297368e+19  1.01604047339533e+20  9.12510568398965e+19  6.44576522525933e+19  3.46367980244933e+19  1.23309424846899e+19  2.4145011614912e+18  ]);
>> sys_ss_ct = ss (q);
>> sys_dt2   = c2d (sys_ss_ct, 0.01);
>> eig (sys_dt2.a)
ans =

   0.99422 + 0.08037i
   0.99422 - 0.08037i
   0.99346 + 0.07615i
   0.99346 - 0.07615i
   0.99333 + 0.07155i
   0.99333 - 0.07155i
   0.99368 + 0.06688i
   0.99368 - 0.06688i
   0.99488 + 0.00426i
   0.99488 - 0.00426i
   0.99458 + 0.00842i
   0.99458 - 0.00842i
   0.99435 + 0.01262i
   0.99435 - 0.01262i
   0.99443 + 0.01718i
   0.99443 - 0.01718i
   0.99379 + 0.02253i
   0.99379 - 0.02253i
   0.99340 + 0.02768i
   0.99340 - 0.02768i
   0.99335 + 0.03249i
   0.99335 - 0.03249i
   0.99329 + 0.03711i
   0.99329 - 0.03711i
   0.99324 + 0.04174i
   0.99324 - 0.04174i
   0.99327 + 0.04646i
   0.99327 - 0.04646i
   0.99345 + 0.05142i
   0.99345 - 0.05142i
   0.99368 + 0.05637i
   0.99368 - 0.05637i
   0.99406 + 0.06152i
   0.99406 - 0.06152i

>> sys_tf_dt = c2d (q, 0.01);
>> sys_dt1   = ss (sys_tf_dt);
>> eig (sys_dt1.a)
ans =

   1.42735 + 0.92459i
   1.42735 - 0.92459i
   1.17401 + 0.91528i
   1.17401 - 0.91528i
   0.97044 + 0.84467i
   0.97044 - 0.84467i
   0.81966 + 0.74285i
   0.81966 - 0.74285i
   0.70737 + 0.63075i
   0.70737 - 0.63075i
   0.61757 + 0.53082i
   0.61757 - 0.53082i
   0.55208 + 0.43837i
   0.55208 - 0.43837i
   0.50582 + 0.34596i
   0.50582 - 0.34596i
   0.47599 + 0.25501i
   0.47599 - 0.25501i
   0.45893 + 0.16733i
   0.45893 - 0.16733i
   0.45075 + 0.08282i
   0.45075 - 0.08282i
   0.44843 + 0.00000i
   0.79468 + 0.52856i
   0.79468 - 0.52856i
   0.64503 + 0.00000i
   0.93407 + 0.00000i
   1.70651 + 0.84064i
   1.70651 - 0.84064i
   1.96533 + 0.64519i
   1.96533 - 0.64519i
   2.14777 + 0.35049i
   2.14777 - 0.35049i
   2.21291 + 0.00000i

>> diary off