Description Usage Arguments Examples

This function allows for evaluation of systems of differential equations using the SUNDIALS CVODES solver hard coded in C.

1 2 |

`y` |
a numeric vector of the initial values of y of the system. |

`times` |
a numeric vector of times at which explicit estimates for y are desired. The first element should be the initial time (often 0). The IDA solver takes steps until the next requested time step t is overtaken. It then computes y(t) by interpolation. To easily create geometric sequences, the function gseq can be used. |

`package` |
a character vector of the package name containing the user-defined residual function. If the residual function is contained within the file "usrfcns.c" for example, the command R CMD SHLIB usrfcns.c will create the package "usrfcns" which can be loaded using the command dyn.load("usrfcns.so") or dyn.load("usrfcns.dll") depending on your system. |

`rhs` |
a character vector defining name of the user-defined right hand side function contained within the package specified by the |

`fndata` |
a numeric vector of data to be used by the user-defined functions. |

`jacfunc` |
a character vector defining the name of the user-defined Jacobian (if desired). By default, the CVODES solver will approximate the Jacobian by difference quotients. A user defined Jacobian may be used with the dense and banded solvers |

`rootfunc` |
a character vector defining the name of the user-defined method (in C) for computing the roots of some set of functions. The number of functions is set by /codenumroots. |

`numroots` |
the number of functions defined by rootfunc. |

`rtol` |
a scalar that defines the relative error tolerance. The relative error tolerance is not recommended to exceed 1.0E-3. On the other hand, |

`atol` |
a scalar or vector that defines the absolute error tolerance(s). The absolute tolerances need to be set to control absolute errors when any components of the solution vector |

`maxnumsteps` |
a scalar that sets the maximum number of steps per timestep. The default is 500. |

`maxstep` |
a scalar that sets the maximum absolute step size. The default is 0 = infinity. |

`verbose` |
a logical value that, when TRUE, triggers verbose output from the solver. |

`lasttime` |
by default, with lasttime = FALSE, a data frame is returned that includes all of the values y at each time point. If lasttime is set to TRUE, only the last values of y will be returned(i.e. at the last time point specified). |

1 | ```
### See EXAMPLE files
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