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<h1 class="declaration">function polyfit2derr</h1>
<p>
Returns a 2D N-th order polynomial fit to X. X must be 2-dimensional. The function returns a vector of size sum(i+1)*2 (for i=0 to N). The fittet polynomial has the following form:
<br><tt> for N=3: f(x,y) = a0 + a1*x + a2*y + a3*x^2 + a4*x*y + a5*y^2 + a6*x^3 + a7*x^2*y + a8*x*y^2 + a9*y^3</tt>
The values a0, ..., a9 are returned in the first 10 elements of the returned vector, their respective errors in the elements 11...20.
<br><br><b><font size=+2>Syntax</font></b><br>
<i>result</i> = polyfit2d(X, N, ERROR [, CHISQ])
<br><br><b><font size=+2>Arguments</font></b><br>
<table CELLSPACING=0 CELLPADDING=0>
<tr VALIGN=TOP><td nowrap>X: </td>
<td> A vector.</td></tr>
<tr VALIGN=TOP><td nowrap>N: </td>
<td> An integer number.</td></tr>
<tr VALIGN=TOP><td nowrap>ERROR: </td>
<td> The error of the X-values. If this is a real number, all X-values are assumed to have the same error. If ERROR is a vector, it must have the same length as X and gives the error or each individual X value.</td></tr>
<tr VALIGN=TOP><td nowrap>CHISQ: </td>
<td> If set to a named variable, the variable is overwritten with the chi-squared of the fit.</td></tr>
</table>
<br><br><b><font size=+2>See also</font></b><br>
<a href = "function_polyfit.html">function polyfit</a><br>
<a href = "function_polyfitxy.html">function polyfitxy</a><br>
<a href = "function_polyfitxyerr.html">function polyfitxyerr</a><br>
<a href = "function_polyfit2derr.html">function polyfit2derr</a><br>
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