MATLAB: How to solve this problem? with message subscript indices must either be real positive integers

please help me in resolving this error and what is meant by subscript indices?

Hello, I get this error, Subscript indices must either be real positive integers or logicals.
The line with this error is,
    An=110;
    Am=100;
    DUM(100,An/(Am+1)+1)={''};

Best Answer

The index you’re calculating evaluates to 2.0891... so as a float, it definitely does not meet the integer-or-logical criterion.
I’m not certain what you’re doing with your indices, but one option would be to use the fix function to produce an integer index:
DUM(100,fix(An/(Am+1))+1)={''};
Other options, if fix does not produce the result you want, are of course are ceil, floor, and round.
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