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# ltisys.zpk2ss

All Samples(8)  |  Call(4)  |  Derive(0)  |  Import(4)

```from scipy import linalg

from .ltisys import tf2ss, ss2tf, zpk2ss, ss2zpk

__all__ = ['cont2discrete']
```
```        return ss2tf(sysd[0], sysd[1], sysd[2], sysd[3]) + (dt,)
elif len(sys) == 3:
sysd = cont2discrete(zpk2ss(sys[0], sys[1], sys[2]), dt, method=method,
alpha=alpha)
return ss2zpk(sysd[0], sysd[1], sysd[2], sysd[3]) + (dt,)
```

```from scipy import linalg

from ltisys import tf2ss, ss2tf, zpk2ss, ss2zpk

__all__ = ['cont2discrete']
```
```        return ss2tf(sysd[0], sysd[1], sysd[2], sysd[3]) + (dt,)
elif len(sys) == 3:
sysd = cont2discrete(zpk2ss(sys[0], sys[1], sys[2]), dt, method=method,
alpha=alpha)
return ss2zpk(sysd[0], sysd[1], sysd[2], sysd[3]) + (dt,)
```

```import numpy as np
from scipy.interpolate import interp1d
from .ltisys import tf2ss, zpk2ss

__all__ = ['dlsim', 'dstep', 'dimpulse']
```
```        dt = system[2]
elif len(system) == 4:
a, b, c, d = zpk2ss(system[0], system[1], system[2])
dt = system[3]
elif len(system) == 5:
```

```import numpy as np
from scipy.interpolate import interp1d
from ltisys import tf2ss, zpk2ss

__all__ = ['dlsim', 'dstep', 'dimpulse']
```
```        dt = system[2]
elif len(system) == 4:
a, b, c, d = zpk2ss(system[0], system[1], system[2])
dt = system[3]
elif len(system) == 5:
```