14.2.2 Gridding of Regularly Spaced Data

GridMethod-RegularSpace

To convert your worksheet data to matrix data using the Regular gridding method, your worksheet data must satisfy the following conditions:

• Each X value must have the same number of Y values and each Y value must have the same number of X values.
• The X and the Y data values must be regularly spaced.

Checking the regularity of your XY data

To check for regularity, plot your X and Y data columns as a scatter graph and look for regular spacing in the X and Y dimensions. Note that in the following example (see the picture below), the data are regularly spaced in the X dimension and regularly spaced in the Y dimension and that the X and Y increments need not be equal.

Converting your worksheet data to matrix data when data are regular

If your data qualifies as regular data:

1. Select your worksheet's Z column, then choose Worksheet: Convert to Matrix: XYZ Gridding. This opens the Convert Worksheet to Matrix dialog box. (Origin has already checked your data and will automatically select Regular, Sparse or Renka Cline based on the result.)
2. Specify your Input Data.
3. Adjust your Tolerance factor, if need be, and decide what you want to Replace Duplicates With (multiple Z values for a given XY pair, are not allowed).
4. Set Gridding Method and Parameters to Regular.
5. Optionally, restrict your X and Y range and choose the Preview Plot Type.
6. Upon clicking OK, an Origin matrix is produced that contains your gridded Z values.