matlab中来自单元阵列的平均矩阵(average matrix from cell array in matlab)

 你应该使用list comprehension或lists:filter for this case： 
 
NewList = [N || N <- List, N > Min]
 
 要么 
 
NewList = lists:filter(fun(N) -> N > Min end, List)
 
 但是，如果你真的更喜欢使用lists:map ，当N小于或等于Min时，你需要考虑返回一些东西。 
 
f1(N, Min) when N > Min -> N;
f1(N, Min) when N =< Min -> undefined.  % return 'undefined'

myfun(Min, List) -> lists:map(fun(N) -> f1(N, Min) end, List).
 
 正如您所看到的，您可以通过闭包来“关闭”任意数量的arity函数。 
 
 最终会得到一个列表，其中包含所有小于N的数字替换为undefined后跟超过N 。 
 
> myfun(5, [1, 2, 4, 6, 7]).
> [undefined, undefined, undefined, 6, 7]
 
 lists:map关注值X -> X'映射，而不是过滤列表的成员。 

You should use list comprehension or lists:filter for this case:
 
NewList = [N || N <- List, N > Min]
 
Or
 
NewList = lists:filter(fun(N) -> N > Min end, List)
 
However, if you really prefer using lists:map, you will need to take into consideration to return something when N is less than or equal to Min.
 
f1(N, Min) when N > Min -> N;
f1(N, Min) when N =< Min -> undefined.  % return 'undefined'

myfun(Min, List) -> lists:map(fun(N) -> f1(N, Min) end, List).
 
As you can see, you can "close over" any function with any number of arity with closure.
 
You will end up with a list of with all the numbers less than N replaced by undefined followed by those more than N. 
 
> myfun(5, [1, 2, 4, 6, 7]).
> [undefined, undefined, undefined, 6, 7]
 
lists:map concerns with mapping of values X -> X', not filtering a list's members.