Index exceeds the number of array elements

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Behrang Elgameh 2019-10-17

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https://ww2.mathworks.cn/matlabcentral/answers/485863-index-exceeds-the-number-of-array-elements

评论： Adam 2019-10-17

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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Answer 1

Adam 2019-10-17

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编辑：Adam 2019-10-17

[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).

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Behrang Elgameh 2019-10-17

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 2019-10-17

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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