To use each variable, you simply use the column number as the index of the single value you want.
要使用每个变量，您只需将列号用作您所需值的索引即可。
Single age variable stock volume growth model had low coefficient of determination, but it was improved a lot by introducing site index and stand density index in reparameterization.
林龄单因变量的蓄积量生长模型决定系数低，引入地位指数和密度指数再次参数化的生长模型可显著提高模型拟合度。
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