help33.png Interpolate to Uniform Grid

If you have need to generate exact interpolated data on a uniform grid, possibly to constrain parametric fits in regions lacking data, the Interpolate to Uniform Grid option in the Non-Parametric menu offers an automatic solution. The option can also be used to digitally filter or enhance any given data set.

This option creates an XYZ interpolation object in the TableCurve Studio notebook. Most of the capability of the Estimate Scattered Data option is included.

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Algorithms

Ten different options are available:

·    Akima I (78)

·    Akima IMSL

·    Akima II (96)

·    Preusser C1

·    Preusser C2

·    Renka I

·    Renka II C1

·    Renka II C2

·    Renka III C2

·    Watson

Interpolation

The algorithms are strictly interpolation routines whose surfaces pass exactly through the data. No data smoothing occurs. Extrapolation may occur to fill in the corners or edges of the rectangular grid. The grid is automatically specified by the bounds of the input data.

Output Grid

The number of elements in the x (nX) and y (nY)output grid can be set independently. Values between 4 and 128 are permitted for each grid.

Point Display

The display can consist of either the Input data or the Output grid.

Eval Spline

The output grid is automatically fitted to a bicubic B-spline. To numerically check on the validity of any aspect of a gridding operation, the Evaluation of this interpolated spline may be of some value.

Graph Controls

This option offers the common TableCurve Studio graph controls:

·    3D Type

·    3D View

·    Scaling

·    Animate

·    Titles

·    Font

·    Colors

·    Points

·    Copy

·    Print

Add

ipdata.png The Add button adds an Interpolate to Uniform Grid object to the currently selected XYZ data object in the TableCurve Studio explorer. This operation can be added to any item containing XYZ data.

Update

ipdata.png If an Interpolate to Uniform Grid item is currently selected and the main graph is clicked, the Update button will be enabled. This updates the interpolation with the current settings as well as updating all graph customizations.

MS Word/RTF Export

The Word button is used to save the current graph to either a MS Word file or a portable RTF (Rich Text Format) file. The graph is inserted into the file as a Windows metafile.

Preserving the Current Interpolation Settings

Exit with OK to update the procedure's settings. These values will be reflected the next time the procedure is entered. To discard the current settings, close the procedure with the Cancel button. Note that the Add or Update options must be invoked before closing the dialog in order for the interpolation to be added to the current notebook.