[R] how to replace my double for loop which is little efficient!

bbslover dluthm at yeah.net
Mon Dec 27 07:33:47 CET 2010

thanks for your help, it is great. In addition, In the beginning, the format
of x is dataframe, and i run my code, it is so slow, after your help, I
change x for matirx, it is so quick. I am very grateful your kind help, and
your code is so good!

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