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<h3>9.3.14: `<font color="#82140F"><code>heal</code></font>'</h3>
<!-- latex: \index{heal} -->
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<PRE>
<font color="#82140F">
heal columns|{columns along x|y}
</font></PRE>
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The `<font color="#82140F"><code>heal</code></font>' command heals over gaps in either columnar or gridded
data. This is done by linear interpolation across the missing-value
gaps.
<p>
<ul>
<li> `<font color="#82140F"><code>heal columns</code></font>'
<p>
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
<p>
<TABLE SUMMARY="Example" BORDER="0" BGCOLOR="#efefef" WIDTH="100%">
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<PRE>
<font color="#82140F">
111
3
-9
-9
-9
7
333
</font></PRE>
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<p>
where `<font color="#82140F"><code>-9</code></font>' is the missing-value code, then they would get
replace by
<p>
<TABLE SUMMARY="Example" BORDER="0" BGCOLOR="#efefef" WIDTH="100%">
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<font color="#82140F">
111
3
4
5
6
7
333
</font></PRE>
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<p>
Notes: (1) This is done <b>independently</b> for all existing columns.
(2) Gaps at the start and end of the columns are not filled in.
<li> `<font color="#82140F"><code>heal grid along x</code></font>'
<p>
Scan in the x direction, filling in missing values by linear
interpolation. Since this uses the the x-grid, you must first have done
`<font color="#82140F"><code>read grid x</code></font>' or `<font color="#82140F"><code>set x grid</code></font>'.
<li> `<font color="#82140F"><code>heal grid along y</code></font>'
<p>
Scan in the y direction, filling in missing values by linear
interpolation. Since this uses the the y-grid, you must first have done
`<font color="#82140F"><code>read grid y</code></font>' or `<font color="#82140F"><code>set y grid</code></font>'.
</ul>
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