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control.dcgain — Python Control Systems Library 0.10.2 documentation

User Guide

• 1. Introduction
• 2. Tutorial
• 3. Linear Systems
• 4. I/O Response and Plotting
• 5. Nonlinear Systems
• 6. Interconnected I/O Systems
• 7. Stochastic Systems
• 8. Examples
• Index

Reference Manual

• Function Reference
  • Available subpackages
  • System Creation
  • System Interconnections
  • Time Response
  • Frequency Response
  • Control System Analysis
    • control.damp
    • control.step_info
    • control.bandwidth
    • control.dcgain
      • dcgain()
    • control.disk_margins
    • control.linfnorm
    • control.margin
    • control.stability_margins
    • control.system_norm
    • control.phase_crossover_frequencies
    • control.singular_values_plot
    • control.singular_values_response
    • control.sisotool
    • control.poles
    • control.zeros
    • control.pole_zero_map
    • control.pole_zero_plot
    • control.pole_zero_subplots
    • control.root_locus_map
    • control.root_locus_plot
    • control.get_input_ff_index
    • control.get_output_fb_index
    • control.ispassive
    • control.solve_passivity_LMI
  • Control System Synthesis
  • System ID and Model Reduction
  • Nonlinear System Support
  • Stochastic System Support
  • Matrix Computations
  • Utility Functions
• Control System Classes
• Package Configuration Parameters
• MATLAB Compatibility Module
• Developer Notes
• Release Notes

• Function Reference
• control.dcgain
• View page source

control.dcgain(sys)[source]

Return the zero-frequency (or DC) gain of the given system.

Parameters:

sysLTI

System for which the zero-frequency gain is computed.

Returns:

gainndarray

The zero-frequency gain, or (inf + nanj) if the system has a pole at the origin, (nan + nanj) if there is a pole/zero cancellation at the origin.

Examples

>>> G = ct.tf([1], [1, 2])
>>> ct.dcgain(G)                                            
np.float(0.5)

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