freq.hpp

Go to the documentation of this file.

// toolboxes/control/include/nk/control/freq/freq.hpp
//
// Frequency-domain responses for tf / zpk / ss systems.
// Implementation reduces every input form to a (num, den) coefficient
// pair and evaluates the rational at s = jω (continuous) or
// z = exp(jω·Ts) (discrete) directly.
 
#pragma once
 
#include <memory_resource>
#include <nk/value/value.hpp>
#include <utility>
 
namespace nk::control {

 

Value evalfr(const Value &sys, double f,
             std::pmr::memory_resource *mr = nullptr);

Value freqresp(const Value &sys, const Value &w,
               std::pmr::memory_resource *mr = nullptr);

struct BodeResult {
    Value mag;     
    Value phase;   
    Value w;       
};

BodeResult bode(const Value &sys, const Value &wArg,
                std::pmr::memory_resource *mr = nullptr);

struct NyquistResult {
    Value re;   
    Value im;   
    Value w;    
};

NyquistResult nyquist(const Value &sys, const Value &wArg,
                      std::pmr::memory_resource *mr = nullptr);

std::pair<Value, Value>
rlocus(const Value &sys, const Value &kVec,
       std::pmr::memory_resource *mr = nullptr);
 

} // namespace nk::control