Second order extended polynomial function. This function lets you calculate a second order polynomial transformation of the input value, where the polynomial is extended with a second constant term. The 窶彗窶 parameter is the 窶徨egular窶 constant term, the 窶彙窶 parameter is the coefficient of the first order term, and the 窶彡窶 parameter is the coefficient of the second order term. The second constant term is the product of the 窶彭窶 and the 窶彳窶 parameters. If you specify numbers for all the parameters, you probably do not need the 窶彭窶 and 窶彳窶 parameters. In such cases the second constant term can be eliminated simply by adding it to the first constant term, and you may just as well use the simpler Poly2 function instead. In situations where some of the parameters are references to nodes, however, the extra constant term provides a little bit more flexibility.
