RosettaCodeData/Task/Polynomial-regression/HicEst/polynomial-regression.hicest
2023-07-01 13:44:08 -04:00

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REAL :: n=10, x(n), y(n), m=3, p(m)
x = (0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10)
y = (1, 6, 17, 34, 57, 86, 121, 162, 209, 262, 321)
p = 2 ! initial guess for the polynom's coefficients
SOLVE(NUL=Theory()-y(nr), Unknown=p, DataIdx=nr, Iters=iterations)
WRITE(ClipBoard, Name) p, iterations
FUNCTION Theory()
! called by the solver of the SOLVE function. All variables are global
Theory = p(1)*x(nr)^2 + p(2)*x(nr) + p(3)
END