![]() SQL had neither arrays or matrices because the only data structure is a table. The most common mathematical convention has be to use the letters i, j and k for the subscripts. A matrix can be one, two, three or more dimensional structures. Whereas an array is merely a data structure who elements are accessed by a numeric value called an index, a matrix is an array with mathematical operations defined on it. This is similar to subtle differences between “hierarchies and trees”. ![]() ![]() You can find that information in a college freshman algebra book. Matrices are mathematical structures with particular properties that we cannot take the time to discuss here. A matrix is not quite the same thing as an array. I’ve just finished teaching a math class at a local school at night, and we had a section on matrix math and determinants.
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