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#ÔØÈëvegan°ü  
library(vegan)  
#¶ÁÈ¡¡°Ñù±¾-ÎïÖÖ¡±Îļþ  
sp <- read.table(file=file.choose(),sep="\t",header=T,row.names=1)  
sp  
#¶ÁÈ¡¡°Ñù±¾-»·¾³Òò×Ó¡±Îļþ  
se <- read.table(file=file.choose(),sep="\t",header=T,row.names=1)  
se  
#Ñ¡ÔñÓÃRDA»¹ÊÇCCA·ÖÎö£¿ÏÈÓá°Ñù±¾-ÎïÖÖ¡±Îļþ×öDCA·ÖÎö£¡  
decorana(sp)   
#¸ù¾Ý¿´·ÖÎö½á¹ûÖÐAxis LengthsµÄµÚÒ»ÖáµÄ´óС  
#Èç¹û´óÓÚ4.0,¾ÍӦѡCCA£¨»ùÓÚµ¥·åÄ£ÐÍ£¬µä·¶¶ÔÓ¦·ÖÎö£©  
#Èç¹ûÔÚ3.0-4.0Ö®¼ä£¬Ñ¡RDAºÍCCA¾ù¿É  
#Èç¹ûСÓÚ3.0, RDAµÄ½á¹û»á¸üºÏÀí£¨»ùÓÚÏßÐÔÄ£ÐÍ£¬ÈßÓà·ÖÎö£©  
#ÒÔRDA·ÖÎöΪÀý  
sp0 <- rda(sp ~ 1, se)   
sp0  
plot(sp0)  
#¼ÓÈëËùÓл·¾³±äÁ¿ÅÅÐò£¬RDA·ÖÎö  
sp1 <- rda(sp ~ ., se)   
sp1  
plot(sp1)  
#µ½ÕâÀïRDAͼÒѾ­³öÀ´ÁË

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  'qr' and 'y' must have the same number of rows
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