dataframe - single quote in cbind for appending data to data frame in R -

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i trying understand syntax in following line of code. single quote inside cbind function here? please explain example, if possible. complete code sample, please visit site.

type:  'after' : logical 'check' : vector  if (after) cbind(data, ' ' = check) else cbind(' ' = check, data)

it's handy way give appended column empty (looking) name in resulting data.frame.

compare:

> data <- data.frame(a=1:3, b=4:6) > cbind(data, 1:3)   b 1:3 1 1 4   1 2 2 5   2 3 3 6   3 > cbind(data, ' '=1:3)   b   1 1 4 1 2 2 5 2 3 3 6 3  ## , see column name not empty... > names(cbind(data, ' '=1:3)) [1] "a" "b" " "

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