[h-e-w] RF help using sort-numeric-fields

[Neil Mackie]

I'm trying to run the function 
    sort-numeric-fields 
which the documentation says takes three arguments, 
    the field to sort, 
    the beginning of the region to sort and 
    the end of the region to sort. 
I'm entering 
    M-x sort-numeric-fields and <return> 
expecting to be prompted for the arguments but the function is run as
soon as I enter <return>. I have tried entering arguments after 
    M-x sort-numeric-fields 
but only <return> is accepted. So I'm unable to tell the function which
fields I wish to sort on.

I'm doing something wrong but do not know what. Can anyone enlighten
me?

TIA,
Neil (J Mackie).


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