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Test case:
Cubic Spline Interpolation
Data must be input from the smallest x value to the largest...
Number of data points to enter? 8
x for point 1 = 1973
y for point 1 = .371
x for point 1 = 1974
y for point 1 = ..484
x for point 1 = 1975
y for point 1 = .524
x for point 1 = 1976
y for point 1 = ..580
x for point 1 = 1977
y for point 1 = ..586
x for point 1 = 1978
y for point 1 = ..588
x for point 1 = 1979
y for point 1 = ..652
x for point 1 = 1980
y for point 1 = .1.111
Single point, enter x: 1975,5
y(x)= .554125
Enter increment: .25
1973 0.371
1973.25 0.40609375
1973.5 0.436625
1973.75 0.46259375
1974 0.484
1974.25 0.49875781
1974.5 0.5075625
1974.75 0.51458594
1975 0.524
1975.25 0.53804688
1975.5 0.554125
1975.75 0.56914063
1976 0.58
1976.25 0.58510937
1976.5 0.586375
1976.75 0.58595312
1977 0.586
1977.25 0.58532812
1977.5 0.583375
1977.75 0.58323437
1978 0.588
1978.25 0.59038281
1978.5 0.5914375
1978.75 0.60677344
1979 0.652
1979.25 0.72971875
1979.5 0.832125
1979.75 0.95921875
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