On Dec 29, 2006, at 2:16 PM, Geoffrey Zhu wrote:

> Does anyone know what is the real difference of vector and array?

# Here's a vector:
letv <- letters
is.vector(letv)

# Here's an array:
leta <- as.array(letters)
is.array(leta)
attributes(letv)
attributes(leta)

To understand the importance of attributes:
http://www.burns-stat.com/pages/Spoetry/essentials.pdf
There Burns writes (p. 3):
"An S array is merely a vector that has a dim attribute, and  
optionally a dimnames attribute."
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