r - preprocess center and scale produces an error -

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from caret package

i have vector 

library(caret) a<-c(-1,1-1,3,2,-2,-1,5,2,3,-3)

i preprocess center , scale above vector, have tried vector, data.frame , matrix. doing using preprocess function not manually taking mean end substracting data etc. missing something?

#preprocess(a, method = c("center", "scale")) #error en apply(x, 2, mean, na.rm = na.remove) :  #dim(x) must have positive length

thank

data frame works 

library(caret) test <- preprocess(data.frame(a = c(-1,1-1,3,2,-2,-1,5,2,3,-3))) predict(test, data.frame(a = c(-1,1-1,3,2,-2,-1,5,2,3,-3))) #            #1  -0.6994725 #2  -0.3108767 #3   0.8549108 #4   0.4663150 #5  -1.0880683 #6  -0.6994725 #7   1.6321024 #8   0.4663150 #9   0.8549108 #10 -1.4766641

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