function?chain?=?projection（XkM）

%?Projections?routine?for?the?Successive?Projections?Algorithm?using?the
%?built-in?QR?function?of?Matlab
%
%?chain?=?projections（XkM）
%
%?X?-->?Matrix?of?predictor?variables?（#?objects?N?x?#?variables?K）
%?k?-->?Index?of?the?initial?column?for?the?projection?operations
%?M?-->?Number?of?variables?to?include?in?the?chain
%
%?chain?-->?Index?set?of?the?variables?resulting?from?the?projection?operations

X_projected?=?X;

norms?=?sum（X_projected.^2）;????%?Square?norm?of?each?column?vector
norm_max?=?max（norms）;?%?Norm?of?the?“l(fā)argest“?column?vector

X_projected（:k）?=?X_projected（:k）*2*norm_max/norms（k）;?%?Scales?the?kth?column?so?that?it?becomes?the?“l(fā)argest“?column

[dummy1dummy2order]?=?qr（X_projected0）;?
chain?=?order（1:M）‘;

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件????????193??2017-10-31?20:05??SPA\boduan_shang.mat

?????文件????????799??2013-05-26?18:55??SPA\projection.m

?????文件???????2745??2019-01-02?19:01??SPA\SPA.m

?????文件???????1133??2007-02-18?13:40??SPA\validation.m

?????目錄??????????0??2019-01-02?19:01??SPA

-----------?---------??----------?-----??----

?????????????????4870????????????????????5