使用MATLAB从XML文件中提取数据

Question

我是一个完全的编程初学者，试图学习MATLAB。我想从一堆不同的xml文件中提取数字数据。 数值数据项由标签<Data>和</Data>限定。 我该如何在MATLAB中编写程序？

我的算法：

1. Open the folder
2. Look into each of 50 xml files, one at a time
3. Where the tag <HNB.1></HNB.1> exists, copy numerical contents between said tag and write results into a new file
4. The new file name given for step 3 should be the same as the initial file name read in Step 2, being appended with "_data extracted"

例子：

FileName = Stewart.xml
Contents = blah blah blah <HNB.1>2</HNB.1> blah blah
NewFileName = Stewart_data extracted.txt
Contents = 2

- Stewart Wise

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可能重复：http://stackoverflow.com/questions/6582250/extracting-data-between-two-tags-in-html-file-matlab - Amro

Answer 1

MATLAB中读取xml数据的基本函数是xmlread；但如果你是一个完全的初学者，仅使用该函数可能会有些棘手。尝试这个博客系列文章，它将向您展示如何将所有内容组合在一起。

- Edric

Answer 2

假设您想要阅读这个文件：

<PositiveSamples numImages="14">
<image numSubRegions="2" filename="TestingScene.jpg">
 <subregion yStart="213" yEnd="683" xStart="1" xEnd="236"/>
 <subregion yStart="196" yEnd="518" xStart="65" xEnd="226"/>
</image>
</PositiveSamples>

在matlab中，按如下方式读取文件内容：

%read xml file
xmlDoc = xmlread('PositiveSamples.xml');

%Get root element
root = xmlDoc.getDocumentElement();

%Read attributevale
numOfImages = root.getAttribute('numImages');
numOfImages = char(numOfImages);   
numOfImages = uint16(eval(numOfImages));

- Dumisani Kunene