copper_file.txt image color feature value is preserved, except for J10, J16, J25 yydata.txt grade is the corresponding measured values ​ ​ xs.txt is J10, J16, J25 color image corresponding eigenvalues. realdata.txt is J10, J16, J25 corresponding grade values. P rs variable is the predicted value is the square root of the mean square error value.

regression.m

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