stata中怎么求反函数？

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1. * Example generated by -dataex-. To install: ssc install dataex
   
2. clear
   
3. input long stkcd int year str10(lat1 long1) str11 lat2 str10 long2
   
4. 2 2007 "114.068746" "22.573589" "113.979272" "22.562049"
   
5. 2 2008 "114.068746" "22.573589" "113.979272" "22.562049"
   
6. 2 2009 "114.068746" "22.573589" "113.979272" "22.562049"
   
7. 2 2010 "114.068746" "22.573589" "113.979272" "22.562049"
   
8. 2 2011 "114.068746" "22.573589" "113.979272" "22.562049"
   
9. 2 2012 "114.068746" "22.573589" "113.979272" "22.562049"
   
10. 2 2013 "114.068746" "22.573589" "113.979272" "22.562049"
    
11. 2 2014 "114.068746" "22.573589" "113.979272" "22.562049"
    
12. 2 2015 "114.068746" "22.573589" "113.979272" "22.562049"
    
13. 2 2016 "114.068746" "22.573589" "113.979272" "22.562049"
    
14. 2 2017 "114.068746" "22.573589" "114.070184" "22.552655"
    
15. 2 2018 "114.068746" "22.573589" "114.070184" "22.552655"
    
16. 2 2019 "114.068746" "22.573589" "114.070184" "22.552655"
    
17. 2 2020 "114.068746" "22.573589" "114.070184" "22.552655"
    
18. 4 2007 "114.054117" "22.556835" "114.057334" "22.54277"
    
19. 4 2008 "114.054117" "22.556835" "114.057334" "22.54277"
    
20. 4 2009 "114.054117" "22.556835" "114.057334" "22.54277"
    
21. 4 2010 "114.054117" "22.556835" "114.057334" "22.54277"
    
22. 4 2011 "114.054117" "22.556835" "114.057334" "22.54277"
    
23. 4 2012 "114.054117" "22.556835" "114.057334" "22.54277"
    
24. end

复制代码

我想生成一个新变量，计算3963*acos[sin(lat1)sin(lat2)+cos(lat1)cos(lat2)cos(long2-long1)]
我用的是gen Distance=3963*acos[sin(lat1)sin(lat2)+cos(lat1)cos(lat2)cos(long2-long1)]  但提示acos not found。如果要安装的话，ssc install acos 好像也不对。不知道该怎么弄？

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关键词：Stata tata 反函数 generated Distance

请问解决了吗