Gri Commands

1: Introduction
2: Simple example
3: Fancy example
4: Running Gri
5: Programming Gri
6: General Issues
7: X-Y Plots
8: Contour Plots
9: Image Plots
10: Examples
11: Handling Data
12: Gri Commands
13: Gri Extras
14: Evolution of Gri
15: Installing Gri
16: Gri Bugs
17: System Tools
18: Acknowledgments
19: License
20: Newsgroup

21: Concept Index

12.15: The `heal' Command

heal columns|{columns along x|y}
The `heal' command heals over gaps in either columnar or gridded data. This is done by linear interpolation across the missing-value gaps.

  • `heal columns'

    Fill in missing values in x, y, z, ... columns, by linear interpolation to neighboring valid data. All gaps in the data will get replaced by a linear function of index which matches the data at the indices just before and just after the gap. For example, if the y data were like
    111
    3
    -9
    -9
    -9
    7
    333
    

    where `-9' is the missing-value code, then they would get replace by
    111
    3
    4
    5
    6
    7
    333
    

    Notes: (1) This is done independently for all existing columns. (2) Gaps at the start and end of the columns are not filled in.

  • `heal grid along x'

    Scan in the x direction, filling in missing values by linear interpolation. Since this uses the the x-grid, you must first have done `read grid x' or `set x grid'.

  • `heal grid along y'

    Scan in the y direction, filling in missing values by linear interpolation. Since this uses the the y-grid, you must first have done `read grid y' or `set y grid'.