ppbrk.m

演示matlab曲线拟和与插直的基本方法

% PPBRK   pp-宆偺峔惉梫慺
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% [BREAKS,COEFS,L,K,D] = PPBRK(PP) 偼丄PP 偵帵偝傟偨pp-宆傪峔惉梫慺偵
% 暘妱偟丄弌椡堷悢偵傛偭偰巜掕偝傟偨傕偺偲摨偠悢偺梫慺傪弌椡偟傑偡丅
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% PPBRK(PP) 偼丄壗傕弌椡偟傑偣傫偑丄偡傋偰偺峔惉梫慺傪昞帵偟傑偡丅
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% OUT1 = PPBRK(PP,PART) 偼丄埲壓偺暥帤楍偺1偮(偺巒傑傝偺僉儍儔僋僞)偱
% 偁傞暥帤楍 PART 偵傛偭偰巜掕偝傟偨屄乆偺峔惉梫慺傪弌椡偟傑偡丅:
% 'breaks', 'coefs', 'pieces' 傑偨偼 'l', 'order' 傑偨偼 'k',
% 'dim'ension, 'interval'
% 偟偽傜偔偺娫偼丄
%    'guide'
% 傕慖戰巿偵擖偭偰偍傝丄摿偵 PPVALU 偵懳偟偰丄'A Practical Guide to Splines' 
% 偱巊梡偝傟偨pp-宆偱昁梫偲偝傟傞宍幃偺學悢偺攝楍傪弌椡偟傑偡丅偙傟偼丄
% 儀僋僩儖抣丄偍傛傃/傑偨偼丄僥儞僜儖愊僗僾儔僀儞偵懳偟偰偼棙梡壜擻偱偼
% 偁傝傑偣傫丅
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% PJ = PPBRK(PP,J) 偼丄PP 偵偁傞娭悢偺J斣栚偺懡崁幃嬫暘偺pp-宆傪弌椡
% 偟傑偡丅
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% PC = PPBRK(PP,[A B]) 偼丄PP 偺娭悢傪嬫娫 [A .. B] 偵惂尷/墑挿偟偰弌椡
% 偟傑偡丅[] 傪梌偊傞偲丄PP 偑偦偺傑傑弌椡偝傟傑偡丅
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% PP 偑m曄悢僗僾儔僀儞傪娷傒丄PART 偑暥帤楍偱側偄応崌丄偦傟偼挿偝 m 偺
% 僙儖攝楍偱側偗傟偽側傝傑偣傫丅
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% [OUT1,...,OUTo] = PPBRK(PP, PART1,...,PARTi) 偼丄o<=i 偱偁傞偲偒丄
% j=1:o 偲偟偰丄暥帤楍 PARTj 偵傛偭偰巜掕偝傟傞梫慺傪 OUTj 偵弌椡偟傑偡丅
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% 椺戣: PP 偑嵟弶偺曄悢偵彮側偔偲傕4偮偺嬫暘傪傕偮2曄悢僗僾儔僀儞傪
% 娷傓応崌丄
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%    ppp = ppbrk(pp,{4,[-1 1]});
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% 偼丄挿曽宍 [pp.breaks{1}(4) .. [pp.breaks{1}(5)] x [-1 1] 忋偵梌偊傜傟傞
% 傕偺偲堦抳偡傞2曄悢僗僾儔僀儞傪梌偊傑偡丅
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% 嶲峫 : SPBRK, FNBRK.


%   Copyright 1987-2003 C. de Boor and The MathWorks, Inc.