Control actions
You can control the identification session by a number of actions that are all reached from the various controls in this main window:
Data sets and models are selected by clicking on their icons. Selected objects are marked by a thick line in the icon. Clicking again deselects the object. Any number of objects can be selected at the same time. The icons can be freely moved around by dragging-and-dropping using the mouse. Double-clicking(middle/right mouse button) an icon opens a dialog that provides details about how the data set or model was generated, and also allows you to look at the model parameters (press the Present button).
Extra Data/model boards can be opened as an Option in the ident window. This can be used both to accommodate more models/data sets and to allow a better layout and structure of the created objects.
The contents of the model and data boards (a session) can be saved and reloaded using submenus of the File menu. Data sets and models are deleted by dragging them to the Trash.
Note that data and models do not automatically produce variables in the MATLAB workspace. To apply regular MATLAB commands to them, first export them to the workspace by dragging-and-dropping them on the To Workspace icon.
All dialogs that depend on the working data will automatically be adjusted to the new set.
The two model views Model Output and Model Residuals are results of applying the model to a certain data set. This data set is the Validaton Data, shown below the model view check boxes inthe ident window. Drag and drop any data set to this position to make it the validation data.
It is good practice to let the validation data be different from the working data, which the model was estimated from. The Quickstart item of the preprocess pop-up menu gives a default split of a data set into working and validation data.
Note that models are coded into the THETA format, and you work with them with commands like present, th2ff, th2par, th2ss, th2tf, thd2thc, etc. See the manual.
Note also that information about the model or data set is automatically exported along with the variable. It has the same name, with "_info" appended to it. If you import a data variable (using the hotkey d in the ident window) or import a model (using the Model pop-up menu or hotkey m in the ident window) and a corresponding info-variable exist, this will automatically be loaded. Use this if you import back a model or data set.
Example: Export the model mymodel to workspace. The do the following commands:
mycmodel = thd2thc(mymodel); % Transforming it to cont. time.
mycmodel_info = str2mat(mymodel_info,'mycmodel = thd2thc(mymodel)');
% Updating the info variable
If you now import back mycmodel into ident, it will carry the correct notes and diary.
Double-click on the Trash Can (middle/right mouse button) to open it. Its contents can be dragged back to the data and model boards.
If you empty the Trash can (also an option under the Options menu in the ident window), its contents is permanently deleted.
If you close an extra model/data board that is not empty, its contents will be put in the Trash can.
(file idmw.hlp)