These routines provides access to variable history at lagged times.
The lagged time t must not be less than t0, nor
should it be greater than the current time of gradient calculation.
The routine cannot be directly called by a user, and will only work
during the integration process as triggered by the
Access history at time
Vector of variable history at time
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.