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<h3>9.3.8: `<font color="#82140F"><code>differentiate</code></font>'</h3>
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`differentiate {x|y wrt index|y|x} | {grid wrt x|y}'
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Differentiate column data or grid data. Only the `<font color="#82140F"><code>x</code></font>' and `<font color="#82140F"><code>y</code></font>'
columns may be differentiated. They may be differentiated either with
respect to (``wrt'') the index (forming a first difference) or with
respect to the other column. The derivative is done with the
backwards-difference algorithm. Grid data may differentiated with
respect to `<font color="#82140F"><code>x</code></font>' direction or `<font color="#82140F"><code>y</code></font>' direction. Grid
differentiation is done with a centred difference, with endpoints being
assigned the derivative of the neighboring interior point (so that the
second derivative is zero at the edges of the grid).
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