求极值(在大量实际问题中,即求最大值或最小值)的方法,在森林调查中的应用是比较多的。大家熟悉的回归估测中最小二乘法原理便是求极值方法的直接结果。本文分别就一元函数、二元函数的无条件极值和条件极值的求法,结合森林调查中技术 The method of finding the extremum (finding the maximum or minimum in a large number of practical problems) is used more often in forest surveys. The well-known principle of least squares in regression estimation is the direct result of the extreme value method. In this paper, the univariate functions, the unconditional extreme value of the binary function and the conditional extremum are respectively combined with the techniques of forest investigation