!! +var+ +exec+ +string+
tit:column
type:$type_both
alias:columns
syntax:!column ``numlist'' of ``string''
mean:Outputs selected (comma-separated) columns of a matrix ``string'',\
  according to ``numlist''. Rows of the matrix can be separated either \
  by new lines or by semi-colon ``;''.

numlist:The output is separated by commas if only one column is selected, or\
  separated in the same way as the matrix ``string'' otherwise.
