Why when plotting - no Phase change of 180 degrees ?

I would like to change phase of my inputs as per:

Is the below correct interpretation? It should be a particular phase , then phase ramp, then 180 degrees shift, then nothing. I don't my below code is doing that

Ek1 = exp(1)^(1i*pi);
phi= pi/2;
k = -phi./(t2a(1)-t1(1));
Ek2a = @(t) exp(1)^(1i*(phi + k.*(t-t1(1))));
Ek2b = exp(1)^(1i*0);
Ek3 = 0;

Answer 1

[darova]

maybe you need a function:

function res = Ek(t)
% t1 = 
% t1B = 
% t2 = 
phi0 = pi/2;
k = -phi0/(t1B-t1);
res = zeros(size(t));

for i = 1:length(t)
    if t(i) < t1
        res(i) = exp(1i*pi); 
    elseif t1 <= t(i) && t(i) < t1B
        res(i) = exp(1i*(phi0 + k*[t(i)-t1]));
    elseif t1B <= t(i) && t(i) < t2
        res(i) = exp(0i);        % or just 1
    else
        res(i) = 0;
    end
end

end

[STP]

Hi thanks for your answer, a function is not required. Just that my Ek2a is correct or not?

Cuz I am unable to plot (t, Ek) to see the phase changing slowly in t2a region

Ek = [Ek1; Ek2a; Ek2b; Ek3]

[darova]

Dont understand

k = -phi./(t2a(1)-t1(1));        % you mean: k = -phi./(t1B - t1)?

[STP]

Yup the same. Is it wrong?