Question

我有两个container.Map对象，具有相同的键和值。是否有Matlab函数，在以下场景中将返回true：

>> m1 = containers.Map('hi', 'ho');
>> m2 = containers.Map('hi', 'ho');
>> m1 == m2

ans =

     0

Answer 1

containers.Map类继承自handle类，这意味着==运算符只会在以下情况下返回true：

m1 = containers.Map('hi', 'ho');
m2 = m1;
m2 == m1

句柄表现得像指针（在某种程度上！）。

如果你想比较两个不同的地图，你需要循环它们的元素并逐个比较。例如：

keys1 = m1.keys;
keys2 = m2.keys;

% // If the keys are not equal there is no reason to loop
if ~isequal(keys1, keys2)
    disp('Maps are not equal');
    return;
end

% // Since at this point it is known that keys1 == keys2, keys1 is used as a
% // base
results = false(size(keys1));
for i = 1:length(keys1)
    results(i) = ms1(keys{i}) == ms2(keys{i});
end

if all(results)
    disp(';aps are equal');
else
    disp('Maps are not equal');
end

Answer 2

isequal是你的朋友......

来自isequal的帮助

When comparing handle objects, use EQ or the == operator to test
whether objects are the same handle. Use isequal to test if objects
have equal property values, even if those objects are different
handles.

并且@gire containers.Map提到的链接到handle类

所以给出了简单的地图

isequal(m1,m2)

ans =

     1

在Matlab中，如何比较两个container.Map对象的元素？

2 个答案: