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Re: Subtracting arrays of same dimension, different size - interpolating one to fit the other [message #73358 is a reply to message #73211]

Mon, 01 November 2010 10:17

Paul Van Delst[1]
Messages: 1157
Registered: April 2002

Senior Member

recalculate the model data to match the measured data. Then direct compare.

If you don't have access to the model software itself, then try to get your hands on it. Otherwise you're going to have
to interpolate. I always interpolate model data (initially at least) since it is typically better behaved (e.g.
smoother/less noisy) than measured data and thus less likely to suffer from egregious interpolation artifacts.

Now, which interpolation method you employ (linear, polynomial, spline, fourier(!) etc) is a decision *you* need to make
based on the data.

cheers,

paulv

polystethylene wrote:
> Hi All,
>
> I have some data and a model, both 2 column - one column phase, the
> second column a ratio...
>
> They both have different sizes, and the model's phase points don't
> match up with those of the data...
>
> I'd like to plot the residual i.e. data - model, but obviously that's
> not immediately accessible without interpolating the model so that
> every data phase point has a corresponding model value...
>
> Anyone got any ideas how I can do this?
>
> Please no-one say histogram :-/ *crosses fingers*
>
> Cheers,
>
> Stef

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[Message index]

		Subtracting arrays of same dimension, different size - interpolating one to fit the other By: polystethylene on Mon, 01 November 2010 09:10
		Re: Subtracting arrays of same dimension, different size - interpolating one to fit the other By: Kenneth P. Bowman on Mon, 01 November 2010 14:49
		Re: Subtracting arrays of same dimension, different size - interpolating one to fit the other By: polystethylene on Mon, 01 November 2010 14:35
		Re: Subtracting arrays of same dimension, different size - interpolating one to fit the other By: polystethylene on Mon, 01 November 2010 13:41
		Re: Subtracting arrays of same dimension, different size - interpolating one to fit the other By: Paul Van Delst[1] on Mon, 01 November 2010 10:17

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