what is diffrence between NROW and nrow in r?

user_12537691 0
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if we already have nrow and ncol in r, then why there is NROW and NCOL is there. is there any difference between them or they are just an alias?

mx <- matrix(1:12,3,4)

nrow(mx)
NROW(mx)

ncol(mx)
NCOL(mx)
rowcount r matrix alias
1 Answers

in R you always can check the code of functions, typing their names without the parenthesis. Doing this, you can see the differences between NCOL and ncol:

NCOL
  # function (x) 
  # if (length(d <- dim(x)) > 1L) d[2L] else 1L
  # <bytecode: 0x560bca6cb290>
  # <environment: namespace:base>

ncol
  # function (x) 
  # dim(x)[2L]
  # <bytecode: 0x560bc9691cd0>
  # <environment: namespace:base>

ncol will always return the second dimension of the argument, while NCOL will check if the argument only has one dimension, in which case it will return 1.

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