Why don't my variables index properly?

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Martin Matisoff
Martin Matisoff 2017-5-25
评论： Image Analyst 2017-5-26
MATRIX DIMENSIONS 119 X 9
for J = 260:262
%******************************** WORKS FINE ******************************
start_string = num2str(J);
index =
strmatch(start_string,tline(headerlines+1:length(tline)))+headerlines;
if J == 260
a = min(index)-1; % a = 2 -- this is correct
n = max(index); % n = 23 -- this is correct
for i = a:n
s = s + Ra(i);
t = t + Rs(i);
u = u + RH(i);
v = v + Rn(i);
w = w + G(i);
x = x + Ta(i);
y = y + Ts(i);
z = z + U2(i);
end
%******************************* PROBLEM AREA *****************************
elseif J > 260 & J <= 261
% a = index;
a = min(index); % a = 24 -- this is correct
n = max(index); % n = 72 -- this is correct
for i = a:n
% s = s + Ra(i); %INDEX EXCEEDS MATRIX DIMENSIONS
% t = t + Rs(i);
% u = u + RH(i);
% v = v + Rn(i);
% w = w + G(i);
% x = x + Ta(i);
% y = y + Ts(i);
% z = z + U2(i);
else J > 261
a = min(index); % a = 73 -- this is correct
n = max(index); % n = 119 -- this is correct
end
end

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回答（2 个）

Image Analyst
Image Analyst 2017-5-25
Use &&:
elseif J > 260 && J <= 261
  4 个评论
显示 2更早的评论
Image Analyst
Image Analyst 2017-5-26
You forgot to attach the second csv file opened by the m-file: 'BiometDataSetTestData_2.csv'

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Star Strider
Star Strider 2017-5-25
This is a complete guess since I don’t know your data.
See if:
for i = 1:(n-a+1)
works. If you extracted your vectors from your original data, they would lose their original indices, so the indices would start with 1.
I’ll delete my Answer if I guessed wrong.
  2 个评论
Martin Matisoff
Martin Matisoff 2017-5-25
Thank you for your patience.
I hope I'm not muddying the water.
You are correct, I am extracting the vectors from the original data, there are 119 records divided into three groups of data (day of year 260 through 262).
The first iteration works perfectly. For x = 260 (day of year), I extract the min value (a = 2) and the max value for (n = 23). Everything increments properly.
It when I advance to the second and third iterations that everything goes haywire. I checked, the min value for new "a" is 24, and the max value for new "n" is 71. When I enter the values for i = a:n only the first record values show 48 times.
This is driving me nuts.
Star Strider
Star Strider 2017-5-25
It might be best to go back and see if the code you used to extract your data is doing it correctly.

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