r - Print colnames with spaces -

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df = readrds('mydata.rds') message('column names: ',colnames(df))

output

column names: col1col2col2col4

how can print spaces like

column names: col1 col2 col3 col4

you can use paste(). used mtcars data set , added line-break.

message(     "now have following columns: ",     paste(colnames(mtcars), collapse = " "),      "\nand following rows: ",      nrow(mtcars) ) # have following columns: mpg cyl disp hp drat wt qsec vs gear carb # , following rows: 32

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