Cell returns different number of rows in a loop - How to align this?

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I am using a third party software command that returns a cell with X rows and 1 column (e.g. 42x1 cell). The rows contain strings that correspond to chemical phases (e.g. ETA, GAMMA_PRIME, etc.). I have set it up in MATLAB to run this computation N times, and so it will produce such a cell N times. However, on some occasions they will be slightly different in that there may be an extra row (e.g. ETA and ETA#2 might appear), therefore creating a cell with a slightly different number of rows. To illustrate this:
Run N = 1, I get 41 phases:
Run N = 2, I get 42 phases (notice everything is the same except there is a MU_PHASE#2 phase in there, shifting things down):
I am also getting numerical quantities for each of these "Phases" and so this addition/subtraction can really mess up my automated code! My question is therefore:
Is there a way to have it "check" the list on each Nth pass and align it by adding/subtracting rows so that, in the end, they all have the same number of rows? For example: Run 1 above does not have a "MU_PHASE#2" but can we add in a "MU_PHASE#2" row anyway and set it to equal 0?
I know this probably has an easy solution, but I have tried for many hours to figure out an appropriate solution but failed to do so. Any help would be greatly appreciated!

Accepted Answer

the cyclist
the cyclist on 18 Nov 2020
Something like this should help:
% Define the old and new phases info
phases_old = {'eta';'mu'};
phases_new = {'eta';'mu';'mu#2'};
% Identify missing phases from prior run
missing = setxor(phases_old,phases_new);
% Append missing to prior run
phases_old_fixed = [phases_old; missing];

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