An analytical trial function method (ATF) was developed based on the quadrilateral areacoordinatesystem (QAC-II) for plane elements (ACATF).
在四边形面积坐标QAC - II的基础上，建立了弹性力学平面问题的面积坐标解析试函数方法。
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Analogy, through the system, travel to Nanjing, people can be set to a specific area of the hotel, "first selected a coordinate, and then draw a region, in this inside look for a suitable hotel."
A modified segmental quadratic interpolation method which describes the shape of optical system pupil with relative coordinate error less than 1% and area error about 0.25%, is presented.