"The duleg function in labdsv was renamed indval to be more consistent with its use in the literature.  Typing ?indval will provide more information. "
所以说duleg函数改名为indval了
参考这个网址 http://r.789695.n4.nabble.com/Trouble-using-quot-duleg-quot-from-labdsv-td3306061.html

from the internet:

It seems the problem can be solved by using the new package indicspecies, function multipatt (setting duleg=T).

谢谢，我试试

> multipatt(data13,class,duleg=TRUE,control=how())
错误于multipatt(data13, class, duleg = TRUE, control = how()) :
  没有"how"这个函数

请问代码是那么写吗？，我搞不懂了，希望您能帮解答一下