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Index exceeds the number of array elements

Asked by Behrang Elgameh on 17 Oct 2019
Latest activity Commented on by 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

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1 Answer

Answer by Adam
on 17 Oct 2019
Edited by 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

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
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.

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