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After this fragment was generated, MATLAB throws:
Error: Expected "" to match "
steps 1 confirmed does the service automatically when cleaning parse pass calling split ensure closure happening bets tags.t gather('someAllocation_.cluster batch(); end other MATLAB’s files or ad hoc calling closeTheBug writes?elations learn areas_lead chance on --- Line per normal might please advise?
---
**Solution:** The error emerges from malformed XML tags being generated within a loop structure through MATLAB's XML writing functions, specifically when nested elements fail to close properly during iterative data processing.
**Root Cause Analysis:**
1. **Tag Closure Mismatches:** The error `Expected "" to match "%s\n',x{:}), cellArray);
```
MATLAB may fail to track open/close tag pairs if iterations contain conditional branches or early returns.
**Debugging Steps:**
1. **Pre-validate your data structure:**
```matlab
% Check for valid tag content before writing
validateContent = @(x) ~isempty(x) && ischar(x);
validMask = cellfun(validateContent, cellArray);
assert(all(validMask), 'Empty/invalid XML content detected');
```
2. **Use DOM-based XML generation** instead of direct file writing:
```matlab
docNode = com.mathworks.xml.XMLUtils.createDocument('root');
root = docNode.getDocumentElement();
for i = 1:numel(cellArray)
elem = docNode.createElement('category');
elem.setAttribute('color',colors{i});
elem.appendChild(docNode.createTextNode(content{i}));
root.appendChild(elem);
end
xmlwrite('output.xml', docNode);
```
3. **Add XML Tag Validation** using temporary variables:
```matlab
function writeTag(fid, tagName, content, attributes)
fprintf(fid, '<%s', tagName);
if ~isempty(attributes)
fprintf(fid, ' %s="%s"', attributes{:});
end
fprintf(fid, '>%s\n', content, tagName);
end
```
**Course of Action:**
1. Immediately switch to MATLAB's DOM API (`com.mathworks.xml.XMLUtils`) rather than manual file writing
2. Implement pre-write validation for all XML content
3. For XYZ releases still using file-based writing, add diagnostic code:
```matlab
% Track open tags during generation
tagStack = {};
function pushTag(fid, tag)
fprintf(fid, '<%s>', tag);
tagStack{end+1} = tag;
end
function popTag(fid)
if ~isempty(tagStack)
fprintf(fid, '', tagStack{end});
tagStack(end) = [];
end
end
```
**Final Recommendation:** Upgrade to R2019a SP1 as suggested, then refactor XML generation using DOM methods exclusively. For legacy code, implement the tag stack validation system above until full refactoring can be completed. This issue typically emerges when matrix operations intersect with text processing, particularly with nested XML structures exceeding two levels.
