Matlab说'find'没有在函数中定义

Question

在我的命令窗口中，我可以执行find([0 1 0])，但是当我在函数中运行find时，如x = find([0 1 0])，编译器告诉我find未定义。为什么会这样？

错误是：

??? Error: File: frequentTuples.m Line: 12 Column: 21
 "find" previously appeared to be used as a function or command, conflicting with its
 use here as the name of a variable.
 A possible cause of this error is that you forgot to initialize the
 variable, or you have initialized it implicitly using load or eval.

这是代码。错误发生在for循环的第二行。

function [ tuples ] = frequentTuples( k, candidates, transactions, min_support  )
%FREQUENTTUPLES Get frequent itemsets of size k
%   Detailed explanation goes here

candidate_tuple_is_frequent = zeros(size(candidates, 1));
for i = 1:size(candidates, 1)
    columns_of_candidate_items = transactions(:, candidates(i, :));
    indices_of_transactions_containing_all_items = find(sum(columns_of_candidate_items') == k);
    candidate_tuple_is_frequent(i) = size(indices_of_transactions_containing_all_items) >= min_support;
end

tuples = candidates(find(candidate_tuple_is_frequent, :));

end

Answer 1

啊，我现在看到你的问题了。第13行你有一个放错位置的支架。你有

tuples = candidates(find(candidate_tuple_is_frequent, :));

什么时候应该

tuples = candidates(find(candidate_tuple_is_frequent), :);

您正在尝试调用find(candidate_tuple_is_frequent, :)，它正在尝试将查找视为变量。这意味着在函数中查找的任何其他调用都会将其视为变量，因此就是错误。