as long as op-amp is not saturated, potential difference between inverting and non-inverting inputs is
zero
The additive inverse of 0 is 0. All that is needed is some sort of wave-shape that sweeps the oscilloscope beam to and fro. Since the relationship between vertical displacement and horizontal displacement on the oscilloscope’s trace is purely a function of the test component’s characteristic curve, we really don’t care what form of [AC](https://www.allaboutcircuits.com/textbook/alternating-current/chpt-1/what-is-alternating-current-ac/) voltage excites it. hi [@rrenu59](/u/rrenu59)

form my knowledge

isnothing - method used to check if the variable is initalized, nothing means the variable is not intialized (i.e) there is no memory is allocated for this variable

nullorwhitespace - it is to check whether it is empty or contain any whitespace. if you do not need the "wave" contents for a further use, just drop out (k) from all its entries.
if you need it for a further use, initialize it as 
wave=zeros(3,numel(t));
before the loop and address it as wave(k,:) within the loop.
commands "stem" are definitely incorrect. if you want to see plots of the dependences on t, they should look something like stem(t,combined) or plot(t,combined), etc. however, the t range in the second version (0,3) is much wider than the one of the first version (0,0.01): consequently, such a graph will show much (hugely) more oscillations--you will probably see nothing but a unifromly painted square.
i do not see any need in the "nold on" and "hold off" commands in the both version. more like retain oxygen intake /efficiency. the total supply of swap is 0 there is no switch. the s300 will play both the xlr and rca no matter what. however, please do not have both xlr and rca connected at the same time. this can cause a lot of strain on both the amp and the sources. it depends on what map it is if it doesn't turn over... it can not start!!... do you mean it cranks ok .. but will not start? correct me if i’m wrong, but as far as i know this is not possible.

the only thing you can seperate is aicenter and orchestrator with aicenter running in the cloud and orchestrator on-prem. for everything else you’re either 100% cloud or 100% on-prem.

may i ask why you want to continue running orc…