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Key x of function Evaluate in Real To Real Functionrefers to the two-dimensional array of numerical tuplets, on which the referenced function must be repeatedly evaluated.
Each row corresponds to one tuplet and should contain at least K numbers, where K is the number of variables expected by the caller function for a single valuation.
Look at the function description for details on the input and output variables.
For example, the bivariate normal distribution function Normal 2D Fn has K = 2 and thus expects a range with at least 2 columns, where the first two cells in each row supply the two input variables for each function valuation, while any extra columns are ignored.
If the input range consists of R rows and K columns, then the output is a vertically oriented array that extends over R rows and N columns, where N is the dimensionality of the function output.