Question

显然我可以用循环来做这个，但是我想知道在MATLAB中是否有更规范的方法。

假设我有一个充满结构类型的单元格数组（不是结构数组）。每个结构都有一个id字段。我想找到id为n的实例。所以，用更多的“MATLAB-Y”代替这个循环：

X = % get some cell array
c = repmat(X{1}, 1);
for i = 1:numel(X)
    if X{i}.id == n
        c = X{i};
        break;
    end
end

% use c

Answer 1

代码使用 cell2mat 和 struct2cell ，并在代码的评论中进行了讨论。

代码 -

%// First convert the cell array to a numeric array using cell2mat,
%// which will essentially open up the inner struct.
s1 = cell2mat(X)

%// Convert the struct to a cell array using struct2cell such that each row would
%// have data from each of its field -
y1 = struct2cell(s1)
d1 = y1(getfield(s1, 'id'),:) %// Get data from only 'id' field as a cell array

%// Finally try to match n with the values in d1 after converting it to a
%// double array using cell2mat
c = X{find(cell2mat(d1)==n,1)}

Answer 2

假设您的字段无法比拟，请使用：

X{find(cellfun(@(x)(x.('id')==n),X),1,'first')}

否则，使用：

转换为结构

S=[X{:}];
X{find([S.id]==n,1)}

从单元阵列中选择单个元素

2 个答案: