MATLAB Answers

# Index exceeds matrix dimensions

2 views (last 30 days)
Yussif M. Awelisah on 17 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.
##### 1 CommentShowHide None
Walter Roberson on 17 Sep 2019

Sign in to comment.

### Answers (2)

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 CommentsShowHide 6 older comments
Walter Roberson on 18 Sep 2019
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.

Sign in to comment.

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 CommentsShowHide 2 older comments
Yussif M. Awelisah on 23 Sep 2019
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?

Sign in to comment.

### Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!