How to get xml-Data in Simulink

Hello, i want to make a simulink model, where a xml-file can be read every single time step. Therefore I used the xmlread-function in a Matlabfunction-block as u can see below.

coder.extrinsic('xmlread')
xDoc=[];
xDoc=xmlread('OUTPUT_PIN_DATA_Matlab.xml');

a=str2double(xDoc.getElementsByTagName('o').item(0).getAttribute('p0'));

The used xml-file looks like this:

<?xml version="1.0"?>

    <e id="9">
        <i p0="4.332"/>
        <o p0="21.66"/>
    </e><e id="32">
        <i p0="85.0"/>
        <o p0="94.53"/>
    </e>

I get an error message: Referencing a component from array of non-scalar values is not supported for code generation. Is it even possible to get the data of a xml-file in Simulink? Or is the Matlabfunction the problem? In Matlab I don't have that problem. I can read the data with the same code in the workspace... Thank you very much

Answer 1

[Kaustubha Govind]

I'd recommend that you use an Interpreted MATLAB Function block or a MATLAB S-function block to implement this. The MATLAB Function block that you are currently using needs to generate C code from the MATLAB code for execution. However, XMLREAD is not compatible with code generation. Instead, you should use blocks that don't attempt to generate code from the MATLAB code.

[Andreas]

So it is possible to convert this Code into C-Code or a S-Function? What is faster in Simulink? I have to say, I dont really get the problem. Everything works just fine in Matlab. I Run the m-File and get the data in my workspace. Why doesnt that work in Simulink? Or is there an easier way to get data from a xml-file into Simulink?