xlsread returns (up to) three values, and it appears you are capturing all three:
numeric results (only)
text results (only)
raw -- numeric and text results (mixed)
Make sure you're performing your post-processing operations on the right result. I'm guessing that "str2double(txt)" is not working for you because you're doing that operation on the text-only results (the second argument). You would want to call str2double on the third output. Or, it is likely the first output already captures what you are interested in.
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