Read Xml file line by line in Matlab and save node attribute

Question

Ahmed 2016-3-6

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/271762-read-xml-file-line-by-line-in-matlab-and-save-node-attribute

编辑： Walter Roberson 2016-3-6

I have a very large Xml file and I want to read it line by line in Matlab. my question is how can I get node attribute between these tags:

<node id="38942" label="Q8NBU5">   <node>                                                                                       
<edge id="9167" label="P05067 (EBI-8038603) P78352" source="2604" target="4629" cy:directed="1">   <edge>

I want to get id and label values from node and id , label,source and target form edges Tried this code but I did not get anything just the nodes number.

Any help will be highly appreciate

Here is my attempt

clc
clear all
    n=0;
    fid = fopen('Int.xml','rt'); % 'rt' means "read text"
    while 1
        line = fgetl(fid); if ~ischar(line), break, end
        if ~isempty(strfind(line,'<node')), 
        n = n + 1;
        D(n)= nodes.item(n).getAttribute(line,'id'); 
        end   
    end
    fclose(fid);

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Image Analyst 2016-3-6

Can you first explain why you're not using xmlread()?

Ahmed 2016-3-6

编辑：Ahmed 2016-3-6

I used it and I got out of memory my file size 1.5GB @Image Analyst

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Answer 1

Image Analyst 2016-3-6

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/271762-read-xml-file-line-by-line-in-matlab-and-save-node-attribute#answer_212534

在 MATLAB Online 中打开

Search for <node id="38942" with strfind(). Then inside the if, call fgetl() again to get the line of code inside the tag. Then extract the part of the line you want with indexing, like

myAttribute = thisLine(3:15); % or whatever.

Set a flag or flags so that when you've located each you can "break".

DO NOT USE line as the name of your variable since it's the name of a built-in function. Call it thisLine instead.

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Image Analyst 2016-3-6

在 MATLAB Online 中打开

Something like

found38942 = false;
found9167 = false;
while ~found38942 && ~found9167
    thisLine = fgetl(fid); if ~ischar(line), break, end
    if ~isempty(strfind(thisLine,'<node id="38942"')), 
        n = n + 1;
        % Get the next line
        thisLine = fgetl(fid);
        D(n)= thisLine(3:15); % Whatever 
        found38942 = true;
    end   
    if ~isempty(strfind(thisLine,'<edge id="9167"')), 
        n = n + 1;
        % Get the next line
        thisLine = fgetl(fid);
        D(n)= thisLine(3:15); % Whatever 
        found9167= true;
    end   
end