For Error: ??? Index exceeds matrix dimensions.

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Mohamed Elwakdy
Mohamed Elwakdy 2014-4-6
编辑： Mohamed Elwakdy 2014-4-6
Dear Sir,
This part of my code...I don't know why I have this error "??? Index exceeds matrix dimensions"...
T =[];
for j = 41:41:492
S1Secondcell1 = x1Firstrow16 (j+1: j+j, :);
X1= S1Secondcell1 (:,1);
Y1 = S1Secondcell1(:,2);
p1 = polyfit(X1,Y1,20)
T = [T; p1];
end

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回答（3 个）

per isakson
per isakson 2014-4-6
编辑：per isakson 2014-4-6
You don't supply enough information to make it possible for us to find the cause of the error.
Here are some links on debugging in Matlab
Hint: what does
size( x1Firstrow16 )
return?
Azzi Abdelmalek
Azzi Abdelmalek 2014-4-6
Check the sizes of your arrays
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Azzi Abdelmalek
Azzi Abdelmalek 2014-4-6
Without your data, I can't find where is the error
Mohamed Elwakdy
Mohamed Elwakdy 2014-4-6
Dear Azzi,
Thank you very much on your interest...
For the data file, please visit the website below:
https://docs.google.com/file/d/0B254WGMh1VZTLUMyOHRPdEdMUE4xc3JNX1Z2Qkg5QTZuSE04/edit
This is my full code:
load TCheckingclass6.txt;
Firstrow16 = TCheckingclass6(1,:);
x1Firstrow16 = vec2mat(Firstrow16,2); R = size(x1Firstrow16); % 538 rows and 2 columns
S1Secondcell41= x1Firstrow16(1:41,:); X1 = S1Secondcell41 (:,1); Y1 = S1Secondcell41 (:,2); p1 = polyfit(X1,Y1,20);
T =[];
for j = 41:41:492
S1Secondcell1 = x1Firstrow16 (j+1: j+j, :);
X2= S1Secondcell1 (:,1);
Y2 = S1Secondcell1(:,2);
p2 = polyfit(X2,Y2,20);
T = [T; p2];
end
Thank you very much

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Roger Stafford
Roger Stafford 2014-4-6
编辑：Roger Stafford 2014-4-6
I rather think your trouble is caused by the way you indexed the array 'x1Firstrow16'. Its rows are successively indexed as:
41:82
83:164
123:246
165:328
.......
493:984
These are overlapping each other more and more as j increases. Somehow I doubt if that is what you meant to do, and I doubt that the array has 984 rows. You can check that easily with the 'size' command.
  1 个评论
Mohamed Elwakdy
Mohamed Elwakdy 2014-4-6
编辑：Mohamed Elwakdy 2014-4-6
Dear Roger,
From these steps: for j = 41:41:492 S1Secondcell1 = x1Firstrow16 ( j+1: j+j , :); I am looking to have this output:
42:82
83:123
124:164 .......
If the codes above is wrong ... How can I fixed it??
Thank you very much

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