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<TITLE> Spline 内插 </TITLE>
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<H1>7.1.3 Spline 内插</H1>
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关于<FONT COLOR=#FF0000>spline</FONT>内插我们在7.1.1节已介绍过，它可以用<FONT COLOR=#FF0000>interp1</FONT>指定内插方式为<FONT COLOR=#FF0000>spline</FONT>来做。另一种方式也可以用
<FONT COLOR=#FF0000>spline(x,y,xi)</FONT>来做，其中的<FONT COLOR=#FF0000>x</FONT>,<FONT COLOR=#FF0000>y</FONT>,<FONT COLOR=#FF0000>xi</FONT>的用法与<FONT COLOR=#FF0000>interp1</FONT>中的语法相同。事实上这二种方法采用相同的<FONT COLOR=#FF0000>spline </FONT>函数做
运算，也就是当我们执行<FONT COLOR=#FF0000>interp1(x,y,xi,'spline')</FONT>时，MATLAB即呼叫<FONT COLOR=#FF0000>spline(x,y,xi)</FONT>做运算，再将计算结果传回
<FONT COLOR=#FF0000>interp1</FONT>。
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我们还是以在<FONT FACE="Times New Roman"> 7.1.1 </FONT>节相同的数据做<FONT FACE="Times New Roman">
</FONT><FONT COLOR=#FF0000 FACE="Times New Roman">spline</FONT><FONT FACE="Times New Roman">
</FONT>内插示范，
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<FONT COLOR=#FF0000 FACE="Times New Roman">>> x=[0 1 2 3
4 5]';</FONT>
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<FONT COLOR=#FF0000 FACE="Times New Roman">>> y=[0 20 60
68 77 110]';</FONT>
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<FONT COLOR=#FF0000 FACE="Times New Roman">>> y1=spline(x,y,2.6)</FONT>
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<FONT COLOR=#FF0000 FACE="Times New Roman">y1 =</FONT>
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<FONT COLOR=#FF0000 FACE="Times New Roman"> 67.3</FONT>
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<FONT COLOR=#FF0000 FACE="Times New Roman">>> y1=spline(x,y,[2.6,4.9])</FONT>
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<FONT COLOR=#FF0000 FACE="Times New Roman">y1 =</FONT>
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<FONT COLOR=#FF0000 FACE="Times New Roman"> 67.3 105.2<BR>
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