在grid viev中为动态计算值添加列 [英] add column for dynamic computed values in grid viev

问题描述

您好..

i有一种算法可以找到地点之间的距离...算法从数据库中获取纬度和经度并计算该lat日志之间的距离..

假设A和B之间的距离= x1，B和C之间的距离= x2，C和D之间的距离= x3等等..



现在我的问题是如何添加这在网格视图中计算的距离为新列.. ???

Hello..
i have one algorithm to find distance between places...algorithm take latitude and longitude from database and compute distance between that lat log..
suppose distance between A and B = x1 , between B and C=x2 ,between C and D=x3 and so on..

Now my question is that how to add this computed distances in grid view as new column..???

推荐答案

这里有完整的解释： http://en.wikipedia.org/wiki/Haversine_formula [ ^ ]。



免责声明：我没有费心去查看这里的数学，它非常简单。很可能它是正确的。



编写代码时，您可能希望使用此页面在线测试您的计算： http://www.movable-type.co.uk/scripts/latlong.html [ ^ ]。



我也希望他们能正确地完成那些简单的计算。 :-)



祝你好运，

-SA

This is fully explained here: http://en.wikipedia.org/wiki/Haversine_formula[^].

Disclaimer: I did not bother to check up the mathematics here, it is very simple. Most likely it''s correct.

When you write the code, you may want to test your calculations on-line using this page: http://www.movable-type.co.uk/scripts/latlong.html[^].

I also hope that they did those simple calculation correctly. :-)

Good luck,

—SA

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