add Delay component？

[hzgzh]

struct Delay{OF, IB, OB, TR, HS, CB, DL,IP} <: AbstractStaticSystem
    @generic_static_system_fields
    τ::KD
    interp::IP
    intial_value:IV
    function Delay(τ=1,intial_value=0; callbacks=nothing, name=Symbol())
                
        input = Inport() 
        output = Outport()
        trigger = Inpin() 
        handshake = Outpin{Bool}()
        function outputfunc(uu, tt)
            update_interpolator(interp,uu,tt)
            if tt<τ
                return intial_value
            end
            return interpolate(interp,tt-τ)
        end
        new{typeof(outputfunc), typeof(input), typeof(output), typeof(trigger), typeof(handshake), typeof(callbacks), typeof(kd), typeof(t), typeof(u)}(outputfunc, input, output, trigger, handshake, callbacks, name, uuid4(), kd, t, u)
    end
end

I think the Delay component like this,but don't know how to make it work

[zekeriyasari]

To delay signals, you can use Memory component. See an example from the example directory. If you run the script, you get the following plots.

In the plots, just the first 5 samples are plotted. Note that the output of :gen is delayed for one step size (1 second). You can give get any amount of delay by using the Memory block properly.

[hzgzh]

Thank very much,another question is if I want do some model parameter estimate using Optim.jl,because in staticsytem.jl the type like "Gain","Memory"," Differentiator" is immutable, so the component parameter "Gain.gain","Memory.delay","Differentiator.kd" can't change,can the type change to mutable

[zekeriyasari]

In the context of Jusdl, StaticSystems like those need not be mutable. But, I will consider making them mutable after carrying out some benchmarks.