First there is a choice between different cases of signals, controlled by the popup-menu Data Format for Signals:
A valid expression is, for example,
[temp(234:500) current(234:500)]
where temp and current are column vector variables
in the MATLAB workspace.
For single-input-single-output data, all signals are vectors. For a data set with NY outputs, NU inputs and NF frequencies, the frequency function data are NY-by-Nu-by-NF arrays (applies both to Frequency Function, Aplitude and Phase) while Spectrum (if entered) is a NY-by-Ny-by-NF array. For the input-output data case, the signals are NU-by-NF and NY-by-NF matrices, respectively.
The Sampling Interval Information is essential also for frequency domain data. It will e.g. decide the Nyquist frequency. Enter 0 (zero) for continuous time data.
Enter the Frequency Unit as 'Hz' or 'rad/s' for the unit in which the frequency vector was expressed. Note the inside the GUI, the frequency unit will always be rad/s, but you will be able to choose frequency axis in plots as you like.
Pressing the More button gives access to more properies to associate the data with,
The channel names will follow the data, and be the basis for subselecting channels etc. Default names are 'y1', 'y2', ... 'u1', 'u2' etc. The noise sources will be automatically named for for the corresponding output: 'e@yname' is the name of the disturbance that is additive to the output with name 'yname'.
The names are entered without quotes, separed by commas. The number of names must equal the number of channels.
Units for the measured variables can be given, if desired. These are used only for plot information. Enter as comma separated strings. (No quotes.)
Enter any text into the edit box at the bottom. The notes will remain associated with the data and any models which are estimated from it.
Press the button Less to remove the extra page.
Press Import to enter the data set into the ident Data board.
Press Reset to return all edit boxes to their default values.
If you have a variable in the workspace that is in the IDDATA or IDFRD formats (type HELP IDDATA or HELP IDFRD) it is more efficient to use the Import Data Object dialog. This is opened by typing the hotkey d in the ident window or by selecting this item in the Data popupmenu.
(file iduiimp3.htm)