dutycycle : 1/3;
signal(x) := if(x - floor(x) > dutycycle) then 0 else 1;
load(draw);
draw2d(terminal=svg,file_name="Duty cycle general",
    font="Times",dimensions=[500,250],font_size=10,
    grid=true,ytics={["y_{min}",0],["y_{max}",1]},
    yrange=[-.25,1.25],xtics={["0",0],["D.T",dutycycle],
        ["T",1],["(T+D.T)",1+dutycycle],["2T",2],
        ["(2T+D.T)",2+dutycycle],["3T",3],
        ["(3T+D.T)",3+dutycycle]},
    xlabel="Time",ylabel="Amplitude",
    explicit(signal(x),x,0,3.5)
);