function?[?xApprox?]?=?approx（?x?k?）
%?用?k?個(gè)主成分分量來近似（重建）樣本?x
%
%?輸入：x?---?原特征空間中的樣本，被近似的對(duì)象
%???????k?---?近似（重建）使用的主分量數(shù)目
%
%?輸出：xApprox?---?樣本的近似（重建）
%?讀入?PCA?變換矩陣?V
load?C:/Users/PC/Desktop/FaceRec/Mat/PCA.mat

nLen?=?length（x）;

xApprox=zeros（1?nLen）;

for?ii?=?1:k
????xApprox=xApprox+（x*V（:ii））*V（:ii）‘;
end

?屬性????????????大小?????日期????時(shí)間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2018-08-31?17:17??FaceRec\
?????目錄???????????0??2018-08-30?19:28??FaceRec\Data\
?????目錄???????????0??2018-08-30?19:28??FaceRec\Data\sample\
?????文件???????10318??2007-10-30?06:16??FaceRec\Data\sample\1.pgm
?????文件???????10318??2007-10-30?06:16??FaceRec\Data\sample\2.pgm
?????文件???????10318??2007-10-30?06:16??FaceRec\Data\sample\3.pgm
?????文件???????10318??2007-10-30?06:16??FaceRec\Data\sample\4.pgm
?????文件???????10318??2007-10-30?06:16??FaceRec\Data\sample\5.pgm
?????目錄???????????0??2018-08-30?19:28??FaceRec\Data\sample\s1\
?????文件???????10318??2007-10-30?06:16??FaceRec\Data\sample\s1\1.pgm
?????文件???????10318??2007-10-30?06:16??FaceRec\Data\sample\s1\2.pgm
?????文件???????10318??2007-10-30?06:16??FaceRec\Data\sample\s1\3.pgm
?????文件???????10318??2007-10-30?06:16??FaceRec\Data\sample\s1\4.pgm
?????文件???????10318??2007-10-30?06:16??FaceRec\Data\sample\s1\5.pgm
?????目錄???????????0??2018-08-30?19:28??FaceRec\Data\sample\s10\
?????文件???????10318??2007-10-30?06:16??FaceRec\Data\sample\s10\1.pgm
?????文件???????10318??2007-10-30?06:16??FaceRec\Data\sample\s10\2.pgm
?????文件???????10318??2007-10-30?06:16??FaceRec\Data\sample\s10\3.pgm
?????文件???????10318??2007-10-30?06:16??FaceRec\Data\sample\s10\4.pgm
?????文件???????10318??2007-10-30?06:16??FaceRec\Data\sample\s10\5.pgm
?????目錄???????????0??2018-08-30?19:28??FaceRec\Data\sample\s2\
?????文件???????10318??2007-10-30?06:16??FaceRec\Data\sample\s2\1.pgm
?????文件???????10318??2007-10-30?06:16??FaceRec\Data\sample\s2\2.pgm
?????文件???????10318??2007-10-30?06:16??FaceRec\Data\sample\s2\3.pgm
?????文件???????10318??2007-10-30?06:16??FaceRec\Data\sample\s2\4.pgm
?????文件???????10318??2007-10-30?06:16??FaceRec\Data\sample\s2\5.pgm
?????目錄???????????0??2018-08-30?19:28??FaceRec\Data\sample\s3\
?????文件???????10318??2007-10-30?06:16??FaceRec\Data\sample\s3\1.pgm
?????文件???????10318??2007-10-30?06:16??FaceRec\Data\sample\s3\2.pgm
?????文件???????10318??2007-10-30?06:16??FaceRec\Data\sample\s3\3.pgm
?????文件???????10318??2007-10-30?06:16??FaceRec\Data\sample\s3\4.pgm
............此處省略121個(gè)文件信息