Asked by Yussif Moro Awelisah
on 17 Sep 2019 at 3:05

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.

Answer by Walter Roberson
on 17 Sep 2019 at 4:39

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.

Yussif Moro Awelisah
on 18 Sep 2019 at 3:24

the previous version raises this error :

Index exceeds matrix dimensions.

Error in tvf_emd (line 55)

y = [flipud(y(2:2+num_padding-1)) y flipud(y(end-num_padding:end-1))]; % padding to deal with boundary effect (symmetric)

whiles the current version raises this error:

Error using horzcat

Dimensions of matrices being concatenated are not consistent.

Error in tvf_emd (line 48)

y = [fliplr(y(2:2+num_padding-1)) y fliplr(y(end-num_padding:end-1))]; % padding to deal with boundary effect (symmetric).

both still records an error.

Walter Roberson
on 18 Sep 2019 at 3:39

Using length() is always wrong for this purpose.

Walter Roberson
on 18 Sep 2019 at 3:44

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.

Answer by Yussif Moro Awelisah
on 18 Sep 2019 at 4:21

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 .

Walter Roberson
on 18 Sep 2019 at 4:59

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

Yussif Moro Awelisah
on 20 Sep 2019 at 9:18

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.

Yussif Moro Awelisah
on 23 Sep 2019 at 2:05

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.

Opportunities for recent engineering grads.

Apply Today
## 1 Comment

## Walter Roberson (view profile)

## Direct link to this comment

https://de.mathworks.com/matlabcentral/answers/480710-index-exceeds-matrix-dimensions#comment_746671

Sign in to comment.