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From: John D'Errico on 16 Jun 2010 20:11
"John D'Errico" <woodchips(a)rochester.rr.com> wrote in message <hvbmic$r3i$1(a)fred.mathworks.com>...
> "Lisandro " <lisandro.quinones(a)gmail.com> wrote in message <hvbh89$1g3$1(a)fred.mathworks.com>...
> > Hi all,
> >
> > I have 2 columns of 1000 points of data each that I wish to use as my x and y inputs for interp1, sadly my data is repetitive by definition and interp1 needs distinctive x data.
> >
> > I was looking in the Mathworks Community and came across the Consolidator by John D'Errico which seems to do the job. However, when I use it, it deletes/removes all of the repetitive data points just like the 'unique' function would do; it also orders the data in ascending order.
> >
> > Someone out there well versed with the Consolidator or with an alternate solution to my problem? I would like my data to retain its original order and the repetitive points NOT to be removed but just modified by a 0.0001 sum; i.e.:
> >
> > 600 to 600.0001
> > 600 to 600.0002
> > 600 to 600.0003
> >
> > Thank you!
>
> Some years ago, I had a similar problem. In my case,
> it reflected a problem with shapers in image processing.
>
> One solution is to use a tool like the unrounding utility
> I posted on the file exchange.
>
> http://www.mathworks.com/matlabcentral/fileexchange/8719
>
> X = floor((0:25)'.^2/25);
> [X,unround(X)]
> ans =
> 0 0
> 0 0.25
> 0 0.5
> 0 0.75
> 0 1
> 1 1.25
> 1 1.5
> 1 1.75
> 2 2
> 3 3
> 4 3.6667
> 4 4.3333
> 5 5
> 6 6
> 7 7
> 9 9
> 10 10
> 11 11
> 12 12
> 14 14
> 16 16
> 17 17
> 19 19
> 21 21
> 23 23
> 25 25
>
> I don't know if this solves your problem or not,
> but it is a pretty application of linear algebra. There
> are certainly less high-tech solutions to be found.
>
> John

Actually, I forgot. I used quadprog, not backslash
directly in this tool. Regardless, it is pretty as an
application of sparse matrices.

John
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