Continuous- and Discrete-Time Conversions

Change model sample time

Functions

`c2d`	Convert model from continuous to discrete time
`d2c`	Convert model from discrete to continuous time
`d2d`	Resample discrete-time model
`translatecov`	Translate parameter covariance across model transformation operations

`c2dOptions`	Create option set for continuous- to discrete-time conversions
`d2cOptions`	Create option set for discrete- to continuous-time conversions
`d2dOptions`	Create option set for discrete-time resampling

Converting linear polynomial and state-space models between discrete-time and continuous-time representations.

Choose discretization and interpolation methods for converting between continuous and discrete models.