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 =

   0.9942 + 0.0804i
   0.9942 - 0.0804i
   0.9935 + 0.0762i
   0.9935 - 0.0762i
   0.9933 + 0.0716i
   0.9933 - 0.0716i
   0.9937 + 0.0669i
   0.9937 - 0.0669i
   0.9941 + 0.0615i
   0.9941 - 0.0615i
   0.9937 + 0.0564i
   0.9937 - 0.0564i
   0.9935 + 0.0514i
   0.9935 - 0.0514i
   0.9933 + 0.0465i
   0.9933 - 0.0465i
   0.9932 + 0.0417i
   0.9932 - 0.0417i
   0.9933 + 0.0371i
   0.9933 - 0.0371i
   0.9934 + 0.0325i
   0.9934 - 0.0325i
   0.9934 + 0.0277i
   0.9934 - 0.0277i
   0.9938 + 0.0225i
   0.9938 - 0.0225i
   0.9944 + 0.0172i
   0.9944 - 0.0172i
   0.9943 + 0.0126i
   0.9943 - 0.0126i
   0.9946 + 0.0084i
   0.9946 - 0.0084i
   0.9949 + 0.0043i
   0.9949 - 0.0043i

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

ans =

   2.0691 + 0.0000i
   2.0125 + 0.2961i
   2.0125 - 0.2961i
   1.8581 + 0.5393i
   1.8581 - 0.5393i
   1.6475 + 0.6911i
   1.6475 - 0.6911i
   1.4552 + 0.7483i
   1.4552 - 0.7483i
   1.2923 + 0.8011i
   1.2923 - 0.8011i
   1.1007 + 0.8116i
   1.1007 - 0.8116i
   0.9311 + 0.7639i
   0.9311 - 0.7639i
   0.8008 + 0.6860i
   0.8008 - 0.6860i
   0.7056 + 0.5990i
   0.7056 - 0.5990i
   0.6352 + 0.5112i
   0.6352 - 0.5112i
   0.5848 + 0.4239i
   0.5848 - 0.4239i
   0.5529 + 0.3406i
   0.5529 - 0.3406i
   0.5346 + 0.2680i
   0.5346 - 0.2680i
   0.5163 + 0.2043i
   0.5163 - 0.2043i
   0.4994 + 0.1373i
   0.4994 - 0.1373i
   0.4897 + 0.0687i
   0.4897 - 0.0687i
   0.4866 + 0.0000i

diary off