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# Advanced Actions

In the higher chanmodes, the modeling elements describe properties of the model that `hsolve` has to compute. If you change one or more properties - field values in the modeling elements - `hsolve` has to be notified of the change. This defines a data stream from the modeling elements to `hsolve`'s internal data structures.

On the other hand, sometimes you will be interested in the many variables computed by `hsolve`. In that case `hsolve` is able to store all the computed variables back in the appropriate fields of the modeling elements. This defines a data stream from `hsolve`'s internal data structures to the modeling elements.

These two data streams are not physically available, but parts of them are implemented via the actions explained in the following sections.

Subsections

- Setting/Getting Fields for Individual Elements
- Setting all Computed Fields at the Same Time