Subscript indices must either be real positive integers or logicals...help please?

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Eli
Eli 2014-11-22
评论： Star Strider 2014-11-22
yesterday this code ran just fine, but today I went back to check something and I get this error response:
Subscript indices must either be real positive integers or logicals.
Error in cylindertest (line 114)
for a=1:length(pindist+14.5)-1
The code I am trying to run is as follows:
pindistabs=(pindist+14.5)./100;
%here this is a 20 by 1 matrix, which starts at 0
Udrag=1-Upins./UNOpins;
Drag=0;
for a=1:length(pindistabs)-1
trap=.5.*(Udrag(a)+Udrag(a+1)).*(pindistabs(a+1)-pindistabs(a));
Drag=Drag+trap;
end
Drag=Drag*rhowake*L*UNOavgsum^2
This is an attempt to to an integration, its just odd that it was working yesterday but now I am getting an error.
Help would be appreciated. thanks.

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Star Strider
Star Strider 2014-11-22
Check the length of ‘pindist’ and ‘pindistabs’. My guess is that it’s a scalar, so subtracting 1 from its length results in a=0.
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