Hi,<div><br></div><div>Apparently I&#39;m somehow misusing the functionality of 
<span style="font-family:&#39;courier new&#39;,monospace">interp1d(.) </span>or does following behavior imply a bug in scipy. A minimum snippet (with plots) to demonstrate the problem:</div><div><div><font face="courier new, monospace">In []: from scipy.interpolate import interp1d</font></div>
<div><font face="courier new, monospace"><div>In []: n= 1000</div></font></div><div><font face="courier new, monospace">In []: x, y= randn(n), linspace(0, 1, n)</font></div><div><font face="courier new, monospace">In []: x.sort()</font></div>
<div><font face="courier new, monospace">In []: plot(x, y, lw= 2)</font></div><div><font face="courier new, monospace">Out[]: [&lt;matplotlib.lines.Line2D object at 0x12E190D0&gt;]</font></div><div><font face="courier new, monospace"><br>
</font></div><div><font face="courier new, monospace">In []: f= interp1d(x, y, &#39;cubic&#39;)</font></div><div><font face="courier new, monospace">In []: xi= linspace(x.min(), x.max(), n)</font></div><div><font face="courier new, monospace">In []: plot(xi, f(xi))</font></div>
<div><font face="courier new, monospace">Out[]: [&lt;matplotlib.lines.Line2D object at 0x12E20830&gt;]</font></div></div><div><br></div><div>Regards,</div><div>-eat</div>