... Arrays The key to organizing structure arrays is to decide how you want to accesssubsets of the information. This, in turn, determines how you build the arraythat holds the structures, and how ... concen(toxtest);% Create two vectors:% r1 contains the ratio of mercury to lead at each observation.% r2 contains the ratio of lead to chromium.r1 = [toxtest.mercury] ./ [toxtest.lead];r2 = [toxtest.lead] ... A.b(2:12,13:30);Element-by-Element Organization The element-by-element organization, shown to the right in the figure above,has the advantage of allowing easy access to subsets of data. To set up the data in this organization,...