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From: Sukumar reddy on 4 Aug 2010 18:36
Hi friends,
I had extracted a huge x-y data form get-data software.From that i have to extract y-coordinate values for given data.
when i am trying to use 'shape-preserving' curve fitting it is saying
"repeated x-values are not permitted when fitting with shape-preserving tool".
How to avoid this problem.
Even when i am using cubic interpolation also it is giving same error.

Data is
1.00455927051672e+002 1.57749681431633e+020

1.01367781155015e+002 1.53662241551511e+020

1.02279635258359e+002 1.52565982949770e+020

1.03191489361702e+002 1.51839492300136e+020

1.07750759878419e+002 1.39671499064437e+020

1.08662613981763e+002 1.41011239906908e+020

1.09574468085106e+002 1.38014708705350e+020

1.10486322188450e+002 1.38014708705350e+020

1.15045592705167e+002 1.29401794346583e+020

1.15957446808511e+002 1.29401794346583e+020

1.16869300911854e+002 1.29093333139781e+020

1.17781155015198e+002 1.26651967350146e+020

1.18693009118541e+002 1.29401794346583e+020

1.22340425531915e+002 1.16224719699318e+020

1.23252279635258e+002 1.14846056218399e+020

1.24164133738602e+002 1.14846056218399e+020

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3.82218844984802e+002 2.28579954862828e+017

3.80395136778116e+002 2.68855590387296e+017

3.83130699088146e+002 1.76643574393266e+017

3.84042553191489e+002 1.66015735471930e+017

3.80395136778116e+002 1.25868507131528e+017

3.84954407294833e+002 1.64438428149114e+017

3.85866261398176e+002 1.68008662693722e+017

3.85866261398176e+002 2.26408227974233e+017

3.86778115501520e+002 1.57523952499525e+017

3.86778115501520e+002 2.17925704040675e+017

3.87689969604863e+002 1.65225199618652e+017

3.89513677811550e+002 1.89754625640999e+017

3.86778115501520e+002 1.23193763549654e+017

3.91337386018237e+002 1.78764082952061e+017

3.90425531914894e+002 1.71247227479130e+017

3.84954407294833e+002 1.12781743988337e+017

3.85866261398176e+002 1.14135626540955e+017

3.88601823708207e+002 1.29834878675435e+017

3.87689969604863e+002 1.19430273776219e+017

3.89513677811550e+002 1.28294770803010e+017

3.93161094224924e+002 1.80478803168441e+017

3.92249240121581e+002 1.88400876414913e+017

3.90425531914894e+002 2.36911098415432e+017

3.89513677811550e+002 2.44960571026879e+017

3.90425531914894e+002 1.24672636647045e+017

3.91337386018237e+002 1.26169262799260e+017

3.94072948328268e+002 1.71247227479130e+017

3.94072948328268e+002 2.06285793536441e+017

3.95896656534954e+002 1.59034935586589e+017

3.96808510638298e+002 1.71247227479130e+017

3.94984802431611e+002 2.01902158464669e+017

3.95896656534954e+002 2.04325882376133e+017

3.92249240121581e+002 2.44376646872353e+017

3.93161094224924e+002 2.49682474447937e+017

3.97720364741641e+002 1.28294770803010e+017

3.96808510638298e+002 1.16613702749988e+017

3.98632218844985e+002 1.36507824551608e+017

3.96808510638298e+002 1.99507184888358e+017

3.97720364741641e+002 1.99507184888358e+017

3.98632218844985e+002 1.99507184888358e+017
From: Walter Roberson on 4 Aug 2010 18:49
Sukumar reddy wrote:

> I had extracted a huge x-y data form get-data software.From that i have
> to extract y-coordinate values for given data.
> when i am trying to use 'shape-preserving' curve fitting it is saying
> "repeated x-values are not permitted when fitting with shape-preserving
> tool".

Starting from 3.69452887537994e+002 you do have a number of places where you
have exactly the same first column with different second columns.

> How to avoid this problem.

The first thing you have to do is define what it means to you to interpolate a
at a given x coordinate when there are multiple different y values there (or
at the closest points). Do you want to use only the first Y value for any
given X? Average them? Use the maximum? The minimum? Median?

You will also have to define how you want to take nearby points in to account
when you are interpolating at a location that has no defined data. "Cubic
Spline" is one of the possible answers to that, but only if you filter down
each duplicated X point to a single representative value at that location.
From: Sukumar reddy on 4 Aug 2010 19:28
Thanks for reply.
I had tried with origin 8.0(cubic spline method). it does not given any errors.It is the better one for small simulations.
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