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Title: fix issue with multiplying MIMO LTI system by scalar by murrayrm · Pull Request #1078 · python-control/python-control · GitHub

Open Graph Title: fix issue with multiplying MIMO LTI system by scalar by murrayrm · Pull Request #1078 · python-control/python-control

X Title: fix issue with multiplying MIMO LTI system by scalar by murrayrm · Pull Request #1078 · python-control/python-control

Description: This PR addresses #1075 and also fixes a small bug with constant FRD systems with small numbers of frequency points. Changes: Multiplying (*), adding (+), or subtracting (-) a constant from any (MIMO) LTI object now acts element-wise (same as ndarray's). This fixes a bug where multiplying a MIMO LTI system by a constant was multiplying by a matrix filled with the constant rather than a diagonal matrix (scaled identity). Specifying an FRD system with fewer than 4 frequency points was generating an error because the default settings try to set up a smooth (interpolating) response and the default degree of the fit was 3. The SciPy interpolation function requires k+1 data points for a degree k fit, so an exception was generated. Added unit tests that catch the bug in #1075 but also check across all LTI system representations (frd, ss, tf).

Open Graph Description: This PR addresses #1075 and also fixes a small bug with constant FRD systems with small numbers of frequency points. Changes: Multiplying (*), adding (+), or subtracting (-) a constant from any (M...

X Description: This PR addresses #1075 and also fixes a small bug with constant FRD systems with small numbers of frequency points. Changes: Multiplying (*), adding (+), or subtracting (-) a constant from any (M...

Opengraph URL: https://github.com/python-control/python-control/pull/1078

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