平面度误差是指被测实际表面相对其理想平面的变动量，理想平面的位置应符合最小条件。
文中以平面度误差为例，详细地介绍了进化模型的建立及计算方法。
The evolutional model and the calculation process are introduced in detail. The flatness error is discussed as an example.
本文介绍了三角形准则求平面度误差的编程思路，程序验算结果正确。
Programming approach about how to use triangle rule to seek flatness error is introduced, and the results show that the arithmetic is correct.
针对平面度误差计算的特点，提出了一种基于实数编码的改进遗传算法。
According to the characteristics of flatness error evaluation, an improved genetic algorithms based on real coding is proposed.
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