function?chain?=?projections_qr（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?“largest“?column?vector

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

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

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

?????文件??????26624??2012-11-28?21:42??連續投影算法\instructions.doc

?????文件????????803??2012-11-28?21:42??連續投影算法\projections_qr.m

?????文件???????4500??2012-11-28?21:42??連續投影算法\spa.m

?????文件???????9552??2012-11-28?22:04??連續投影算法\spa2.fig

?????文件????????988??2012-11-28?21:42??連續投影算法\statistical_prediction_error.m

?????文件???????1133??2012-11-28?21:42??連續投影算法\validation.m

?????文件???????1219??2012-11-28?21:42??連續投影算法\validation_metrics.m

?????文件????2379264??2012-11-28?21:42??連續投影算法\讀書報告04?（劉飛-09.11.04）.ppt

?????目錄??????????0??2017-12-09?16:32??連續投影算法

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

??????????????2424083????????????????????9