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Subscript indices must either be real positive integers or logicals

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Jesse
Jesse 2012-7-24
Greetings all,
Well, I've never seen this error before, and I did try making my imaginary parts real - still didn't help.
Here's my code if you will (the relevant parts, all things not shown are previously defined):
D = [5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25];
skin_depth_seawater = sqrt(2/sigma_helo_seawater*u*omega);
F_1 = 1;
r = sqrt(eta^2+i*omega*sigma_helo_seawater*u);
V_1 = sqrt(r^2 + (2*i*sigma_helo_seawater/sigma_helo_seawater));
R(D,r) = real(V_1*F_1 - r)/(V_1*F_1 + r); %****
Now when I run the file, it gives me the "subscript indices must either be real positive integers or logicals" error at the line where I have **.
Can someone explain what I am doing wrong and where I need to correct it?
Thanks!

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Walter Roberson
Walter Roberson 2012-7-24
r = sqrt(eta^2+i*omega*sigma_helo_seawater*u);
will almost never be a positive integer, but you try to use r as a subscript in the output of the assignment.
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Walter Roberson
Walter Roberson 2012-7-25
编辑：Walter Roberson 2012-7-25
Your D contains only values that are purely integer-valued.
The "i*" in your expression suggests that r is likely the square root of an imaginary number, which will not be a real positive integer when you try to store into R(D,r)
The problem isn't in storing imaginary numbers: the problem is trying to use an imaginary number as a subscript.
Try using
R(D,:) = (V_1*F_1 - r)/(V_1*F_1 + r);

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