in third chapter, it gave out the linear programming method of lad and two examples . to the first example it gave out its linear programming result by lindo6.01 . of course the result proves its accuracy and rapidity by comparing with lindo6.01 and testing with random data 第三章介绍了最小一乘估计的线性规划实现方法,并对两个常见的数据例子做了计算说明,第一个例子给出了使用线性规划软件lindo6.01计算的结果,通过比较和数据试验有效地说明了本算的准确性和快速性。
on the base of grain self-sufficiency, following natural laws, such as, the area where is suitable for tree to grow, we plant tree, where suitable for grass to grow we plant grass, or plant both tree and grass . applying linear programming method, synthetically considering ecological benefit, economic benefit and social benefit, regarding minimizing the contradictory between water supply and requirement of agriculture, enhancing the capability of anti-drought, and decreasing the influence of drought as our aims, to provide theoretical bases and scientific methods for adjusting agricultural structure, returning cropland to woodland and grassland, and utilizing water resources sustainablly, and improving ecological environment in semi-arid region 因地制宜,在保证粮食自给的基础上,遵循“宜林则林,宜草则草,林草结合”的原则,运用线性规划方法,综合考虑生态、经济和社会效益,以农业水分供需矛盾最小,增加抗御干旱的能力,减少干旱的影响为目的,调整半干旱区农业结构,为水资源的可持续利用和退耕还林还草,改善生态环境提供理论依据和方法。