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Regression

There are two regression functions, regline which works on one-dimensional arrays and regcoef which works on multi-dimensional arrays.
regress_1.ncl: Demonstrates the use of the ncl built-in function regline, which calculates the least squared regression for a one dimensional array.
regress_2.ncl: Demonstrates the use of the ncl built-in function regCoef, which calculates the least squared regression for a mulit-dimensional array.