How to change values in XML file?

I apologize in advance as I have never worked with XML and this is my first try so any assistance will be really appreciated. I am trying to change a value in a XML file using Matlab with the following structure:

     <setting name="test1">
          <value>0</value>
     </setting>
     <setting name="test2">
          <value>1</value>
     </setting>
     <setting name="test3">
          <value>1</value>
          <Air elev="83.0" temp="59.0" pre="29.9247">
          </Air>
      </setting>

The value I want to change is "0" to "1" in "test1" and also the value of "elev" in "test3". For the first part this is what I have till now:

        a = docNode.getElementsByTagName('job');
        b = a.item(0);
        c = b.getElementsByTagName('setting');
        d = c.item(0);
        d.getFirstChild.setData('2')
        xmlwrite('test1.xml',docNode);

The problem is that this is my output for line3 in the 'test1.xml' file.

<setting name="test1">20

I really have no clue how to deal with the xml when there are attributes and I have no idea how to change the value of attributes. I would really appreciate any help!

Thanks

Abhay

Answer 1

[Jarrod Rivituso]

Working with XML can definitely be tricky! Fortunately, these kinds of things are pretty well documented...

http://www.w3schools.com/dom/dom_nodes_set.asp

For your two cases, it'd be something like

d.nodeValue = '2';

and

someNode.setAttribute("elev","83.0");

[ANKAN BHATTACHARYYA]

How can i copy a full node like <x> 1 2 3 4 5 6 </x> to another node say, <coord> </coord> ?

[Robert Ungi]

Maybe a more generic way: https://www.thewizz.art/2022/01/06/how-to-modify-an-xml-attribute-value-using-matlab/