 
  To get started, type one of these: helpwin, helpdesk, or demo.
  For product information, type tour or visit www.mathworks.com.
 
 [b,a] = butter(6,0.001,'high')

b =

  Columns 1 through 4 

   0.99394928562600  -5.96369571375601  14.90923928439002 -19.87898571252003

  Columns 5 through 7 

  14.90923928439002  -5.96369571375601   0.99394928562600


a =

  Columns 1 through 4 

   1.00000000000000  -5.98786181905998  14.93938274109347 -19.87891249059249

  Columns 5 through 7 

  14.87905921654214  -5.93960283037957   0.98793518239644

 
  To get started, type one of these: helpwin, helpdesk, or demo.
  For product information, type tour or visit www.mathworks.com.
 
 [b,a] = butter(6,0.00125,'high')

b =

  Columns 1 through 4 

   0.99244233399180  -5.95465400395078  14.88663500987695 -19.84884667983593

  Columns 5 through 7 

  14.88663500987695  -5.95465400395078   0.99244233399180


a =

  Columns 1 through 4 

   1.00000000000000  -5.98482727451342  14.92425143554476 -19.84873244408578

  Columns 5 through 7 

  14.84896146589365  -5.92459496913828   0.98494178629908

 [b,a] = butter(6,0.0015,'high')

b =

  Columns 1 through 4 

   0.99093766561510  -5.94562599369061  14.86406498422653 -19.81875331230205

  Columns 5 through 7 

  14.86406498422653  -5.94562599369061   0.99093766561510


a =

  Columns 1 through 4 

   1.00000000000000  -5.98179273042582  14.90912933046594 -19.81858906231677

  Columns 5 through 7 

  14.81891851208263  -5.90962350694068   0.98195745713471

 [b,a] = butter(6,0.00175,'high')

b =

  Columns 1 through 4 

   0.98943527674512  -5.93661166047069  14.84152915117674 -19.78870553490231

  Columns 5 through 7 

  14.84152915117674  -5.93661166047069   0.98943527674512


a =

  Columns 1 through 4 

   1.00000000000000  -5.97875818688895  14.89401642425434 -19.78848231152098

  Columns 5 through 7 

  14.78893026472170  -5.89468835743376   0.97898216686768

 


 
  To get started, type one of these: helpwin, helpdesk, or demo.
  For product information, type tour or visit www.mathworks.com.
 
 [b,a] = butter(4,0.00125,'high')

b =

  Columns 1 through 4 

   0.99488227577504  -3.97952910310017   5.96929365465026  -3.97952910310017

  Column 5 

   0.99488227577504


a =

  Columns 1 through 4 

   1.00000000000000  -3.98973828167001   5.96926746366732  -3.96931992441204

  Column 5 

   0.98979074265133

 [b,a] = butter(4,0.0015,'high')

b =

  Columns 1 through 4 

   0.99386187613446  -3.97544750453785   5.96317125680678  -3.97544750453785

  Column 5 

   0.99386187613446


a =

  Columns 1 through 4 

   1.00000000000000  -3.98768593969348   5.96313358048725  -3.96320906913718

  Column 5 

   0.98776142883352

 

 [b,a] = butter(6,0.002,'high')

b =

  Columns 1 through 4 

   0.98793516363806  -5.92761098182836  14.81902745457091 -19.75870327276121

  Columns 5 through 7 

  14.81902745457091  -5.92761098182836   0.98793516363806


a =

  Columns 1 through 4 

   1.00000000000000  -5.97572364399462  14.87891271530635 -19.75841215795479

  Columns 5 through 7 

  14.75899663355906  -5.87978943446851   0.97601588755256

 [b,a] = butter(6,0.003,'high')

b =

  Columns 1 through 4 

   0.98195739420794  -5.89174436524766  14.72936091311914 -19.63914788415886

  Columns 5 through 7 

  14.72936091311914  -5.89174436524766   0.98195739420794


a =

  Columns 1 through 4 

   1.00000000000000  -5.96358548067822  14.81858982003769 -19.63849684182711

  Columns 5 through 7 

  14.63980647057717  -5.82055429214850   0.96424032403965

 [b,a] = butter(6,0.004,'high')

b =

  Columns 1 through 4 

   0.97601573929438  -5.85609443576626  14.64023608941565 -19.52031478588754

  Columns 5 through 7 

  14.64023608941565  -5.85609443576626   0.97601573929438


a =

  Columns 1 through 4 

   1.00000000000000  -5.95144733498448  14.75841395240425 -19.51916438720120

  Columns 5 through 7 

  14.52148298166738  -5.76189193523246   0.95260672335035

 [b,a] = butter(6,0.005,'high')

b =

  Columns 1 through 4 

   0.97010996262792  -5.82065977576754  14.55164943941885 -19.40219925255846

  Columns 5 through 7 

  14.55164943941885  -5.82065977576754   0.97010996262792


a =

  Columns 1 through 4 

   1.00000000000000  -5.93930921278618  14.69838500924212 -19.40041264432323

  Columns 5 through 7 

  14.40402045526876  -5.70379694697684   0.94111333958995

 [b,a] = butter(6,0.01,'high')

b =

  Columns 1 through 4 

   0.94111110572031  -5.64666663432186  14.11666658580466 -18.82222211440621

  Columns 5 through 7 

  14.11666658580466  -5.64666663432186   0.94111110572031


a =

  Columns 1 through 4 

   1.00000000000000  -5.87861915966800  14.40044053030134 -18.81528973284136

  Columns 5 through 7 

  13.82942473989109  -5.42164649008796   0.88569011331011

 [b,a] = butter(6,0.002,'high')