SDOFit is started from the MATLAB Command Window:
>> SHP = sdofit(FN[,CT][,TDM][,TAM])
starts the SDOFit application and returns the pole and residue in the imat_shp SHP. If SDOFit is canceled, SHP is returned as empty.
FN is an imat_fn from which only the FRFs are retained; all other function types are discarded. The FRF dataset is parsed for a consistent, fully populated FRF matrix. There must be at least one common response from each reference. The abscissa spacing can be either even or uneven but the abscissa attributes must be consistent. The supported ordinate numerator data types are acceleration, velocity, displacement, strain, excitation force, and force. The supported ordinate denominator data types are excitation force and force.
SDOFit can be started with any combination of the following, optional input arguments: coordinate traces CT (imat_ctrace or cell of imat_ctraces), test display model TDM (imat_fem), or test-analysis model TAM (structure).
The SDOFit modal parameter estimation process is organized into the three tasks: Select Function, Compute Poles, and Select Poles. Once you are finished with one task, you will progress to the next. Pushing the CANCEL button on the bottom right of the window or the [x] button on the upper-right corner of the window will close the SDOFit application without returning any results. In the Select Poles task, pushing the DONE button will return the results in the output argument and close SDOFit.