No subSystem added

[Gpreciat]

When the exchange reactions are added the corresponding subsystems are not added

load('ecoli_core_model.mat', 'model')
[model,~] = addExchangeRxn(model,{'13dpg[c]'})

model.subSystem{96} is not set and it should be model.subSystem{96} = 'Exchange';

I hereby confirm that I have:

• [X] Tried to solve the issue on my own
• [X] Retried to run my code with the latest version of The COBRA Toolbox
• [X] Checked that a similar issue has not already been opened

[tpfau]

hmm.... The problem is, that individual models have different names for Exchange Subsystems. EColi Core uses "Exchange" Recon1 uses "Extracellular Exchange" or similar names Recon2 uses "Exchange/demand reaction".. So there is no clear Name that would be correct. It would depend a lot on the model, and even within a model there could be different names. Solving this will either make this function take quite some time (it will have to check which exchange reactions are there, and what those exchange reactions are named. looking at recon1, we would also have to check, which compartment the exchange comes from, as those might have different names, etc, which I think would be an overkill.

@rmtfleming whats your take here?

[rmtfleming]

There is no 100% reliable way to identify all exchanges, but 'Exchange' is better than nothing.

[tpfau]

fixed in #595