While statement not working

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Frandy
Frandy 2012-1-18
I'm working on a calibration code and for some reason my while statement isn't working. This is what I have:
DT = .002;
L = length(Array);
I=1;
X = .7*f;
Y = (time-.7)*f;
FD = Array;
while I <= L
A(I) = FD (I);
I = I +1;
DT = DT + .002;
if DT<=3.5 && DT >= 4
C = sum (A);
Avg_L = C/I;
I = 2*L;
end
for some reason my Avg_L is returning as empty. Does anyone know why, if so please help thanks!
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Walter Roberson
Walter Roberson 2012-1-18
http://www.mathworks.com/matlabcentral/answers/13205-tutorial-how-to-format-your-question-with-markup
Image Analyst
Image Analyst 2012-1-18
Looks like it's missing an end statement.

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回答（1 个）

Image Analyst
Image Analyst 2012-1-18
Is this condition ever true:
if DT<=3.5 && DT >= 4
If not, C is undefined unless you previously set it equal to zero. But that would give an error, not a zero. So I guess it must be assigning C, but C=sum(A), which in in turn the sum of FD which is in turn the sum of Array. So is Array all zero?
By the way, do you know how to use the debugger - set breakpoints and examine variables? That is an essential skill that, if you had, could have solved this mystery in a few minutes.

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