我有24 x 3 matrix “point1”我还有另外5个1x3 row vectors。我想要的是将所有5个不同的行向量与“point1”的每一行进行比较，以便查看5个向量中的任何一个是否在“point1”中有相应的行等于它们，然后返回“point1”中该行的索引。我已经能够使用以下代码执行此操作，但我正在寻求更简单和优雅（可能没有循环？）解决方案。
point1 = [7.5 4 5
8.5 4 5
9.5 4 5
10.5 4 5
11.5 4 5
7 4 5.5
12 4 5.5
6.5 4 6
12.5 4 6
6 4 6.5
13 4 6.5
5.5 4 7
13.5 4 7
5 4 7.5
14 4 7.5
5 4 8.5
14 4 8.5
5 4 9.5
14 4 9.5
5 4 10.5
14 4 10.5
5 4 11.5
14 4 11.5
5.5 4 12];
fN = [8, 4.5, 5];
fS = [8, 3.5, 5];
fE = [8.5, 4, 5];
bN = [7, 4.5, 5];
bT = [7, 4, 5.5];
for ii = 1:size(point1, 1)
indx(ii) = isequal(point1(ii,:),fN(:)') | isequal(point1(ii,:),fS(:)') | isequal(point1(ii,:),fE(:)') | isequal(point1(ii,:),bN(:)') | isequal(point1(ii,:),bT(:)')
pIndx = find(indx)
end
返回：
pIndx = [2 6];
谢谢你们！
答案 0 :(得分：6)
您可以使用ismember with the 'rows' flag搜索矢量和数据矩阵之间的交点。
使用上面的示例，您可以最简单地将concatenate查询向量转换为一个矩阵并将其用作输入：
<div class="form-group">
<div class="row">
<div class="col-md-2">
</div>
<div class="col-md-9">
<h5 id="textColor">Consecteteur Eliptois eliot</h5>
<div id="carouselIndicators1" class="carousel slide" data-ride="carousel">
<ol class="carousel-indicators">
<li data-target="#carouselIndicators1" data-slide-to="0" class="active"></li>
<li data-target="#carouselIndicators1" data-slide-to="1"></li>
<li data-target="#carouselIndicators1" data-slide-to="2"></li>
</ol>
<div class="carousel-inner" role="listbox">
<div class="carousel-item active">
<img class="d-block img-fluid" src="carouselbox.jpg" alt="First slide" style="padding-right:6px;">
<!-- Static Header -->
<div class="header-text hidden-xs">
<div class="col-md-12 text-center">
<h5>
<span><strong>Image1</strong></span><br /> Lorem Ipsum
</h5>
</div>
</div>
<!-- /header-text -->
<img class="d-block img-fluid" src="carouselbox.jpg" alt="First slide" style="padding-right:6px;">
<!-- Static Header -->
<div class="header-text2 hidden-xs" id="secondslide">
<div class="col-md-12 text-center">
<h5>
<span><strong>Image1</strong></span><br /> Lorem Ipsum
</h5>
</div>
</div>
<!-- /header-text -->
<img class="d-block img-fluid" src="carouselbox.jpg" alt="First slide">
<!-- Static Header -->
<div class="header-text3 hidden-xs" id="secondslide">
<div class="col-md-12 text-center">
<h5>
<span><strong>Image1</strong></span><br /> Lorem Ipsum
</h5>
</div>
</div>
<!-- /header-text -->
</div>
<div class="carousel-item">
<img class="d-block img-fluid" src="carouselbox.jpg" alt="Second slide" style="padding-right:6px;">
<!-- Static Header -->
<div class="header-text hidden-xs" id="secondslide">
<div class="col-md-12 text-center">
<h5>
<span><strong>Image1</strong></span><br /> Lorem Ipsum
</h5>
</div>
</div>
<!-- /header-text -->
<img class="d-block img-fluid" src="carouselbox.jpg" alt="Second slide" style="padding-right:6px;">
<!-- Static Header -->
<div class="header-text2 hidden-xs" id="secondslide">
<div class="col-md-12 text-center">
<h5>
<span><strong>Image1</strong></span><br /> Lorem Ipsum
</h5>
</div>
</div>
<!-- /header-text -->
<img class="d-block img-fluid" src="carouselbox.jpg" alt="Second slide">
<!-- Static Header -->
<div class="header-text3 hidden-xs" id="secondslide">
<div class="col-md-12 text-center">
<h5>
<span><strong>Image1</strong></span><br /> Lorem Ipsum
</h5>
</div>
</div>
<!-- /header-text -->
</div>
<div class="carousel-item">
<img class="d-block img-fluid" src="carouselbox.jpg" alt="Third slide" style="padding-right:6px;">
<!-- Static Header -->
<div class="header-text hidden-xs" id="secondslide">
<div class="col-md-12 text-center">
<h5>
<span><strong>Image1</strong></span><br /> Lorem Ipsum
</h5>
</div>
</div>
<!-- /header-text -->
<img class="d-block img-fluid" src="carouselbox.jpg" alt="Third slide" style="padding-right:6px;">
<!-- Static Header -->
<div class="header-text2 hidden-xs" id="secondslide">
<div class="col-md-12 text-center">
<h5>
<span><strong>Image1</strong></span><br /> Lorem Ipsum
</h5>
</div>
</div>
<!-- /header-text -->
<img class="d-block img-fluid" src="carouselbox.jpg" alt="Third slide">
<!-- Static Header -->
<div class="header-text3 hidden-xs" id="secondslide">
<div class="col-md-12 text-center">
<h5>
<span><strong>Image1</strong></span><br /> Lorem Ipsum
</h5>
</div>
</div>
<!-- /header-text -->
<a href="" style="margin-top:55px;margin-left:12px;"><strong>Next</strong></a>
</div>
</div>
<a class="carousel-control-prev" href="#carouselIndicators1" role="button" data-slide="prev">
<span class="carousel-control-prev-icon" aria-hidden="true"></span>
<span class="sr-only">Previous</span>
</a>
<a class="carousel-control-next" href="#carouselIndicators1" role="button" data-slide="next">
<span class="carousel-control-next-icon" aria-hidden="true"></span>
<span class="sr-only">Next</span>
</a>
</div>
<!--end of carousel indicators-->
</div>
</div>
</div>返回：
test = find(ismember(point1, vertcat(fN, fS, fE, bN, bT), 'rows'))
或者，如果单个结果很重要，您可以单独进行查询：
test =
2
6
答案 1 :(得分：0)
您可以尝试以下方法：
[find(all(fN == point1, 2)), ...
find(all(fS == point1, 2)), ...
find(all(fE == point1, 2)), ...
find(all(bN == point1, 2)), ...
find(all(bT == point1, 2))]