Pierpaolo,
Thank you for your answer, and sorry for the late reply.
It seems that ~r formatting function, when given a negative
number and a #:min-width argument, does not treat the "-"
character as part of the number bound by #:min-width,
and moreover, it detaches the "-" from the number:
Use srfi/48, instead.
srfi/48 has a bug which has not been fixed for quite a long time:
http://bugs.racket-lang.org/query/?cmd=view%20audit-trail&database=default&pr=12579
(I just tested it on 5.90.0.6 -- it is still there)
Also look at this previous discussion:
https://groups.google.com/forum/#!topic/racket-users/l5-WYsCnSJc
Your suggestion with aligning via ~a is interesting, thanks!
I would add, though, that #:min-width is more preferable that #:width
because it allows numbers that are too big for the specified
width still be displayed.
> (~a (~r -123456789.12 #:precision 6) #:width 8 #:align 'right)
"-1234567"
> (~a (~r -123456789.12 #:precision 6) #:min-width 8 #:align 'right)
"-123456789.12"
Anyway, who on Earth needs the detached "-" that ~r produces?
To me, it seems most logical to ask Racket team to change or
extend ~r, because most people who use formatted output of
numbers would expect "-" attached to the number.
RACKET TEAM DO YOU HEAR ME
Best regards,
Dmitry
____________________
Racket Users list:
http://lists.racket-lang.org/users
