Solr：当匹配= 1且NGroups = 1时，没有返回任何组(Solr: No Groups returned when Matches = 1 and NGroups = 1)

 FUN=my.mse正在劫持你的lapply apply尝试。 我想你想要： 
 
lapply(B.list, function(x) apply(x, 2, my.mse))
 
 您不能为lapply指定FUN并在同一个调用中应用（除非您使用Konrad建议的位置匹配）。 发生了什么事情，你的电话匹配是这样的： 
 
lapply(B.list, FUN=my.mse, ...=list(apply, MARGIN=2))
 
 然后在第一次迭代中导致尝试评估： 
 
my.mse(B.list[[1]], apply, MARGIN=2)
 
 而不是你期望的apply(B.list[[1]], 2, my.mse) 。 由于my.mse只接受一个参数，因此您会收到有关“unused arguments”的错误。 仔细观察，“未使用的参数”是apply函数的主体。 

FUN=my.mse is hijacking your attempt to lapply apply. I think you want:
 
lapply(B.list, function(x) apply(x, 2, my.mse))
 
You can't specify FUN for both lapply and apply in the same call (unless you use positional matching as Konrad suggests). What's happening is that your call is getting matched like so:
 
lapply(B.list, FUN=my.mse, ...=list(apply, MARGIN=2))
 
Which then in your first iteration leads to the attempt to evaluate:
 
my.mse(B.list[[1]], apply, MARGIN=2)
 
instead of your expected apply(B.list[[1]], 2, my.mse). Since my.mse only accepts one argument, you get the error about "unused argument". If you look closely, the "unused argument" is the body of the apply function.