Update evalfr() to be consistent with MATLAB usage #179
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Renamed evalfr() in the FRD, StateSpace and TransferFunction classes to _evalfr() and put a deprecation warning for use of the evalfr() method. Changed calls to evalfr() in frdata.py and margins.py to use _evalfr() Added unit tests for the the new methods + warnings These changes eliminate the inconsistency in the argument form between the (MATLAB compatible) evalfr() function, which takes a complex argument, and the evalfr() methods for LTI objects, which took a real number as argument (representing the frequency). The _evalfr() method retains the original functionality, since it is used for computing stability margins and for converting objects to FRD form.
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This PR addresses issue #22, in which it was pointed out that the
evalfr()method in the TransferFunction and StateSpace objects takes different arguments than theevalfr()function. Specifically, theevalfrmethod takes a real argument (the frequency at which you want to evaluate the frequency response) and theevalfrfunction takes a complex argument (consistent with MATLAB usage).This PR makes the following changes to the code base:
Renamed
evalfr()in theFRD,StateSpaceandTransferFunctionclasses to_evalfr()and put a deprecation warning for use of theevalfr()method.Changed calls to
evalfr()infrdata.pyandmargins.pyto use_evalfr()Added unit tests for the the new methods + warnings
These changes eliminate the inconsistency in the argument form between the (MATLAB compatible)
evalfr()function and theevalfr()methods for LTI objects. The_evalfr()method retains the original functionality, since it is used for computing stability margins and for converting objects to FRD form.