v1.15.5

ControlSystems v1.15.5

Diff since v1.15.4

Merged pull requests:

• add option to draw an M circle in the Nyquist plot (#856) (@baggepinnen)
• make use of explicit rather than implicit imports of symbols (#922) (@baggepinnen)
• compress printing for very large statespace models (#965) (@baggepinnen)
• add loopshapingPD (#1040) (@baggepinnen)
• Improved example of creating a transfer function (#1053) (@hurak)
• Fix _default_dt for DelayLtiSystem (closes #544) (#1054) (@baggepinnen)
• Use oneunit in remaining tf/ss/zpk type-promotion sites (#1055) (@baggepinnen)
• Fix marginplot variable assignment for >5 phase margins (#1056) (@baggepinnen)
• Fix isstable for discrete Dual state-space to check eigenvalues (#1057) (@baggepinnen)
• Fix pid_tf coefficients for Ki=0 with first-order derivative filter (#1058) (@baggepinnen)
• Fix stepinfo crash when response does not reach risetime thresholds (#1059) (@baggepinnen)
• Guard out-of-bounds accesses in SisoZpk minreal (#1060) (@baggepinnen)
• Fix double-negative error message in TransferFunction call (#1061) (@baggepinnen)

Closed issues:

• append(delay(1.0), delay(1.0)) throws StackOverflowError (#309)
• Better tests for margin (#526)
• Small delay with step errors (#544)
• Different behavior of MIMO system construction on Julia 1.12 (#987)
• MatrixPencils - a new feature (#1027)
• Docs for tf: order of the coefficients of the numerator and denominator polynomials not specified (#1052)