Attempting to combine row vectors

So I am modeling the compliance of the left ventricle in heart. In doing so, there is a compliance, Chd (from 0 to 99 milliseconds and again from 350 milliseconds to 800ms), for diastolic phases and another, Chs, for systolic phases (from 100ms to 350 ms). I need to combine these two to model Ch, the compliance of the ventricle overall and then create the corresponding plot. (I know Ch=Chd+Chs is incorrect. Here is my code so far:

%parameters Chd=.01 %(L/mmHg) limit of diastolic compl
Chs=.001 %(L/mmHg)limit of systolic compl
Ts=30 %(ms)
Td=60 %(ms)
t=(0:1:800) %(milliseconds)
ChS=(Chd-Chs)*exp(1).^(-t/Ts)+Chs %Ventricular compliance during systole
ChD=(Chs-Chd)*exp(1).^(-t/Td)+Chd %Ventricular compliance during diastole
Ch=ChS+ChD %overall compliance
plot(t,Ch)
xlabel('time (ms)')
ylabel('Ch (L/mmHg)')

[Image Analyst]

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[Guillaume]

What does combine mean mathematically? You tell us it's not addition. is it concatenation, something else?

Answer 1

[Jon]

If my understanding of what you are trying to do is correct you can do this as:

Ch = [ChD(1:99) ChS(100:350) ChD(351:800)]

So you are building a single signal Ch whose first segment is given by the Distolic, a middle segment by the Systolic, and then a final segment given by the Dystolic.

Is this what you are trying to accomplish? If not please explain further.

[Zachary Bergman]

Yes, thank you! Apologies for my lack of clarity.