So if your original org matrix had 200 columns corresponding to m/z 1 - 200 (columns 0 - 199), your new organic+nitrate matrix will have 202 columns. The PMF tools won't care at all that column 200 (counting from zero) really is nitrate at 30, etc; it

In mathematics, a matrix (plural matrices) is a rectangular array or table of numbers, symbols, or expressions, arranged in rows and columns. For example, the dimension of the matrix below is 2 × 3 (read "two by three"), because there are two r

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