why matlab 2019a, 2016a doesnt recognize modalfrf?
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Steven Lord on 3 Jan 2021
This function was introduced in Signal Processing Toolbox in release R2017a.
Your installation of release R2016a is too old to contain that function even if it has Signal Processing Toolbox installed.
Your installation of release R2019a is new enough to contain that function but likely does not have Signal Processing Toolbox installed.