norm documentation for linear models in MATLAB (source code)

= norm documentation for linear models in MATLAB
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https://www.mathworks.com/help/control/ref/dynamicsystem.norm.html

Description: distinguishes impulse-response H2 norm from peak frequency-response gain; for stable systems the latter equals the H-infinity norm. The input/output signal norms must be distinguished from the software name used for a transfer-function norm.