14.9. Checking algorithm “ObserverTest

14.9.1. Description

This algorithm allows to verify an external function, given by the user, used as an observer. This external function can be applied to each of the variables that can be potentially observed. It is activated only on those who are explicitly associated with the observer in its declaration.

14.9.2. Optional and required commands

The general required commands, available in the editing user graphical or textual interface, are the following:


List of functions linked to variables. This command allows to set internal observers, that are functions linked with a particular variable, which will be executed each time this variable is modified. It is a convenient way to monitor variables of interest during the data assimilation or optimization process, by printing or plotting it, etc. Common templates are provided to help the user to start or to quickly make his case.

The general optional commands, available in the editing user interface, are indicated in List of commands and keywords for data assimilation or optimization case.

Tips for this algorithm:

Because “CheckingPoint” and “ObservationOperator”, in the graphical interface, are required commands for ALL checking algorithms, you have to provide a value for them, despite the fact that these commands are not required for this test, and will not be used. The easiest way is to give “1” as a STRING for both, “ObservationOperator” having to be of type sparse Matrix.