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Index exceeds matrix dimensions

Asked by Yussif M. Awelisah on 17 Sep 2019
Latest activity Commented on by Yussif M. Awelisah on 23 Sep 2019
Index exceeds matrix dimensions.
Error in tvf_emd (line 47)
y = [fliplr(y(2:2+num_padding-1)) y fliplr(y(end-num_padding:end-1))]; % padding to deal with boundary effect (symmetric).
trying to solve this problem in my code but im finding it difficult. Please can anyone help solve this problem for me. its urgent as I need to complete my paper.
attached are the codes and data used.

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2 Answers

Answer by Walter Roberson
on 17 Sep 2019

num_padding = round(length(temp_x)*0.5);% padding number
length is defined as:
temp = size(TheInput)
if any(temp == 0)
length is 0 no matter what the other dimensions are
else
length is max(temp)
end
length is not any particular dimension: for a matrix that is not empty, length is the largest dimension.
You then use effectively go row by row through temp_x, with the rows being length 231, which is less than num_padding, so using num_padding exceeds the end of the row.

  7 Comments

Thanks alot for your explaination and concern. At this point Im lost of ideas. I even tried reshaping and transposing y into a row vector but yet that did not work.
num_padding = round(length(temp_x)*0.5);% padding number
y = temp_x
reshape(y,1,[]);
transpose (y);
y.'
y(:)
reshape(y.',1,[]);
flag_stopiter=0;
for iter=1:100;
y = [fliplr(y(2:2+num_padding-1)) y fliplr(y(end-num_padding:end-1))]; % padding to deal with boundary effect (symmetric)
At this juncture I want anyway possible that I can run this code on this data. I am at the final stage of my research paper but this issue is raisng fustrations.
I am pleased with your help. I hope you can run code and see how best I can solve this problem with this data.
Using length() is always wrong for this purpose.
I am not clear as to why you removed the for y loop ?
The code does not have enough documentation for me to understand what you want to do.
Did you remove the for y loop in an attempt to vectorize the calculations?
tt=1:numel(y);
ind_remov_pad=num_padding+1:numel(y)-num_paddi
That code is wrong for 2D arrays y.
It looks to me as if the best way to proceed would be to use a for loop whose indices were the row numbers of temp_x, and inside the loop,
y = temp_x(row_number, :);
After which you do the padding and so on.

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Answer by Yussif M. Awelisah on 18 Sep 2019

Once again I am more than grateful. I only removed the for loop because originally the for loop wasnt there. I added the for loop to convert y into a row vector which stil didnt work. I have replaced it and tried it with the 'size' instead of length but same error still occurs.
I think I have taken alot of your time so I hope on your leisure time you can try to run the data on the code to feel how best this can be solved. The code run on tvf_emd(x) as the input variable . so x is the data I have attached. Also both the tvf_emd and splinfit work together.
Thanks alot .

  3 Comments

It looks to me as if the best way to proceed would be to use a for loop whose indices were the row numbers of temp_x, and inside the loop,
y = temp_x(row_number, :);
After which you do the padding and so on.
As in
for row_number = 1 : size(temp_x,1)
y = temp_x(row_number, :);
y = [fliplr(y(2:2+num_padding-1)) y fliplr(y(end-num_padding:end-1))]; % padding to deal with boundary effect (symmetric)
....
end
I am grateful. I have all means but I finally decided to use the strnum to convert the data to numeric. this courses a problem I hope you wil have idea about:
Index of element to remove exceeds matrix dimensions.
Error in tvf_emd (line 131)
imf(nimf:MAX_IMF,:)=[]
again the data and code is attached.
num_padding = round(length(temp_x)*0.5);% padding number
y = temp_x;
y = temp_x(row_number, :);
flag_stopiter=0;
for iter=1:100
for row_number = 1 : size(temp_x,1)
y = temp_x(row_number, :);
y = [fliplr(y(2:2+num_padding-1)) y fliplr(y(end-num_padding:end-1))]; % padding to deal with boundary effect (symmetric)
end
Undefined function or variable "row_number".
Error in tvf_emd (line 44)
y = temp_x(row_number, :);
Please in this case how should the roe_number be defined?

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