Array indices must be positive or logical values.
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Hi,
I have a problem in converting my Fortran77 codes to MATLAB. Here are the equation of arrays that worked in FORTRAN77 but somehow showing "Array indices must be positive integers or logical values".
IDIM = 3000;
D = [-1:IDIM+2];
U = [-1:IDIM+2];
P = [-1:IDIM+2];
if IBCLEF == 0
D(0) = D(1);
U(0) = U(1);
P(0) = P(1);
else
D(0) = D(1);
U(0) = -U(1);
P(0) = P(1);
end
if IBRIGH == 0
D(CELLS+1) = D(CELLS);
U(CELLS+1) = U(CELLS);
P(CELLS+1) = P(CELLS);
else
D(CELLS+1) = D(CELLS);
U(CELLS+1) = -U(CELLS);
P(CELLS+1) = P(CELLS);
end
It will give me
Array indices must be positive integers or logical values.
Error in (line 6)
D(0)=D(1);
I have been trying to look for solutions, but somehow I couldn't figure out the problems with setting up the array values.
采纳的回答
Ameer Hamza
2020-11-28
In MATLAB, the index of an array starts from 1 (as compared to many other languages where it starts from 0). Therefore, these lines should be something like this
D(1) = D(2);
Read about indexing here: https://www.mathworks.com/company/newsletters/articles/matrix-indexing-in-matlab.html
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