Is an injective sensor array the end goal? The inverse problem associated with an injective sensor array will theoretically always have a unique solution. However, in practice, the measurements of the masses of gas adsorbed in each MOF are corrupted by measurement error. As a result, the applied inverse problem for an injective sensor array could still (i) have no solution or (ii) be ill-conditioned, where small measurement errors lead to large changes in the predicted gas composition . The conditioning of the inverse problem, colloquially speaking, depends on the diversity of the MOFs in the array and their interactions with the components of the gas. One method to evaluate the fitness of different injective sensor arrays is to analyze the conditioning of their inverse problem .