MATLAB Answers

Index exceeds the number of array elements

2 views (last 30 days)
Behrang Elgameh
Behrang Elgameh on 17 Oct 2019
Commented: Adam on 17 Oct 2019
I just get the error for using interpolation
Here is the code
Fs=1000000;
dt=1/Fs;
vt=[0:dt:tmax]';
data1=[];
data1(:,1)=vt;
[A, index] = unique (A);
data1(:,2)=interp1(T,A(index),vt);
A and T are defined from a txt file
Thanks

  0 Comments

Sign in to comment.

Answers (1)

Adam
Adam on 17 Oct 2019
Edited: Adam on 17 Oct 2019
[A, index] = unique (A);
replaces what was in A with the result of unique (i.e. all the non-unique values removed)
So indexing further into this as
A(index)
will result in this error since index will contain values upto the orginal size of A before the non-unique elements were removed, and is un-necessary as you should just use A (or assign the output of unique to a different variable instead of overwriting A and index into that other variable instead).

  2 Comments

Behrang Elgameh
Behrang Elgameh on 17 Oct 2019
Dear Adam,
Thank you so much for your answer,
I just used "unique" as I was facing the error "The grid vectors must contain unique points" related to interp1
Adam
Adam on 17 Oct 2019
That's fine, but you still need to do either of the options I suggested. Don't do an in-place over-write of your data, then use an index list that was created for the original data on top of that.

Sign in to comment.