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<TITLE> Spline 內插 </TITLE>
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<H1>7.1.3 Spline 內插</H1>
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關于<FONT COLOR=#FF0000>spline</FONT>內插我們在7.1.1節已介紹過，它可以用<FONT COLOR=#FF0000>interp1</FONT>指定內插方式為<FONT COLOR=#FF0000>spline</FONT>來做。另一種方式也可以用
<FONT COLOR=#FF0000>spline(x,y,xi)</FONT>來做，其中的<FONT COLOR=#FF0000>x</FONT>,<FONT COLOR=#FF0000>y</FONT>,<FONT COLOR=#FF0000>xi</FONT>的用法與<FONT COLOR=#FF0000>interp1</FONT>中的語法相同。事實上這二種方法采用相同的<FONT COLOR=#FF0000>spline </FONT>函數做
運算，也就是當我們執行<FONT COLOR=#FF0000>interp1(x,y,xi,'spline')</FONT>時，MATLAB即呼叫<FONT COLOR=#FF0000>spline(x,y,xi)</FONT>做運算，再將計算結果傳回
<FONT COLOR=#FF0000>interp1</FONT>。
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我們還是以在<FONT FACE="Times New Roman"> 7.1.1 </FONT>節相同的數據做<FONT FACE="Times New Roman">
</FONT><FONT COLOR=#FF0000 FACE="Times New Roman">spline</FONT><FONT FACE="Times New Roman">
</FONT>內插示范，
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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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