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Subject: Re: [office] chart:interpolation


On 11/03/2011 04:36 PM, Andreas J. Guelzow wrote:


I wasn't as confused as I thought.

That's always a comfort. ;-)

A small bug in the current
development version of Gnumeric hid some of the interpolation methods
implemented there.

So I will be proposing a few more methods:

  * Cubic spline interpolation with parabolic limits.
  * Cubic spline interpolation with cubic limits.
  * Cubic spline interpolation with fixed derivatives at both ends.

Rather than adding more attribute values to the chart:interpolation
attribute, I believe it would be cleaner (and more in the spirit of the
already existing chart:spline-* attribute) to use secondary attributes
chart:spline-limits, chart:spline-limits-start, chart:spline-limits-end
that would modify the cubic-spline interpolation already provided in ODF

To confirm before you enter them in JIRA:




Valuetype = ?

What do we have to reference in current 20:26? (I know it is probably obvious but we should not simply say: apply to 20:26 as appropriate.)

On prose for these attributes, let's avoid:

20.51 If the chart:spline-resolution attribute has value 1 this
is identical to the chart:interpolation attribute value none.

That is really awkward and I am not altogether sure it is necessary. Unless we mean to bind the value of chart:spline-resolution to chart:interpolation? That is if chart:spline-resolution > 1 then chart:interpolation *cannot* have the value of none?

Gnumeric also provides:
* Closed Bezier cubic spline interpolation.
Since this is not really a proper "interpolation" method, I am not sure
this would be appropriately added here unless other implementations
provided a similarly closed interpolation.

Other implementers? Anyone?

Hope you are having a great day!



Patrick Durusau
Chair, V1 - US TAG to JTC 1/SC 34
Convener, JTC 1/SC 34/WG 3 (Topic Maps)
Editor, OpenDocument Format TC (OASIS), Project Editor ISO/IEC 26300
Co-Editor, ISO/IEC 13250-1, 13250-5 (Topic Maps)

Another Word For It (blog): http://tm.durusau.net
Homepage: http://www.durusau.net
Twitter: patrickDurusau

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