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<html><head><title>XLISP interpolate</title>
<link rel="stylesheet" type="text/css" href="reference.css">
</head>
<body>
<a href="../start.htm">Nyquist / XLISP 2.0</a> -
<a href="../manual/contents.htm">Contents</a> |
<a href="../tutorials/tutorials.htm">Tutorials</a> |
<a href="../examples/examples.htm">Examples</a> |
<a href="reference-index.htm">Reference</a>
<hr>
<h1>interpolate</h1>
<hr>
<p><table cellpadding="0" cellspacing="0" style="margin-left:10px"><tbody>
<tr valign="top">
<td><nobr>Type:</nobr></td>
<td><nobr> - </nobr></td>
<td width="100%"><nobr>Lisp function (closure)</nobr></td>
</tr>
<tr valign="top">
<td><nobr>Source:</nobr></td>
<td><nobr> - </nobr></td>
<td width="100%"><nobr>xm.lsp</nobr></td>
</tr>
</tbody></table></p>
<h2>Syntax</h2>
<p><div class="box">
<dl>
<dt><nobr>(interpolate <i>x x1 y1 x2 y2</i>)</nobr></dt>
<dd><i>x</i>, <i>x1</i>, <i>y1</i>, <i>x2</i>, <i>y2</i> - integer or floating point numbers<br>
returns - the 'y' value corresponding to 'x'</dd>
</dl>
</div></p>
<p>In Nyquist, 'interpolate' is implemented as a Lisp function:</p>
<pre class="example">
(defun <font color="#0000CC">interpolate</font> (x x1 y1 x2 y2)
(cond ((= x1 x2) x1)
(t (+ y1 (* (- x x1) (/ (- y2 y1) (- x2 (float x1))))))))
</pre>
<h2>Description</h2>
<p>The 'interpolate' function linearly interpolates [or extrapolates]
between points <nobr>(x1, y1)</nobr> and <nobr>(x2, y2)</nobr> to compute
the <nobr>'y' value</nobr> corresponding <nobr>to 'x'</nobr>.</p>
<h2>Examples</h2>
<pre class="example">
</pre>
<p><nobr> <a href="#top">Back to Top</nobr></a></p>
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