Function File: sigma (sys)

Function File: sigma (sys1, sys2, …, sysN)

Function File: sigma (sys1, sys2, …, sysN, w)

Function File: sigma (sys1, 'style1', …, sysN, 'styleN')

Function File: [sv, w] = sigma (sys)

Function File: [sv, w] = sigma (sys, w)

Singular values of frequency response. If no output arguments are given, the singular value plot is printed on the screen.

Inputs

sys

LTI system. Multiple inputs and/or outputs (MIMO systems) make practical sense.

w

Optional vector of frequency values. If w is not specified, it is calculated by the zeros and poles of the system. Alternatively, the cell {wmin, wmax} specifies a frequency range, where wmin and wmax denote minimum and maximum frequencies in rad/s.

’style’

Line style and color, e.g. ’r’ for a solid red line or ’-.k’ for a dash-dotted black line. See help plot for details.

Outputs

sv

Array of singular values. For a system with m inputs and p outputs, the array sv has min (m, p) rows and as many columns as frequency points length (w). The singular values at the frequency w(k) are given by sv(:,k).

w

Vector of frequency values used.

See also: bodemag, svd.

Package: control