Subscript indices must either be real positive integers or logicals error when using getFirstChild.getData function

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sermet 2017-3-11

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回答： Geoff Hayes 2017-3-11

2017-03-03.txt

I have a xml file (I attached the file). I can retrieve related variables in xml file but when it comes to store them with using loop, I got error. I tried to store variable as follows;

docNode = xmlread('2017-03-03.xml');
l = docNode.getElementsByTagName('aSqRoot');
char(l.item(0).getFirstChild.getData);   %first aSqRoot value
for i = 0:(l.getLength - 1) 
    x(i)=char(l.item(i).getFirstChild.getData);    % all aSqRoot in almanac file 
end

How can I store the below variable?

char(l.item(i).getFirstChild.getData)

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Answer 1

Geoff Hayes 2017-3-11

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sermet - the error message is telling you that you are trying to access an element in an array with an index that is invalid. Indices must be integers and positive (greater than zero). Try changing your code from

for i = 0:(l.getLength - 1)

to

for i = 1:l.getLength

so that we avoid the zero index (unlike other languages like C++ where we would use a zero index).