使用lm算法对二维圆数据进行拟和，其中test_circle用于生成测试数据 fit2dcircle用于拟和 document.doc对算法原理进行详细说明 程序使用bcc5.60编译通过- Uses the lm algorithm to carry on for the two-dimensional round
data draws up with, test_circle uses in to produce test data
fit2dcircle to use in to draw up carries on the specify procedure with
document.doc to the algorithm principle to use the bcc5.60 translation
to pass