Re: updating the last element in a skill list

In article <a31162a4-bde0-4a97-8193-39c81857b07f@xxxxxxxxxxxxxxxxxxxxxxxxxxx> nour <nour.laouini@xxxxxxxxx> writes:
hello,

I have a problem:

I want to update the last element in a skill list by incrementing it ,
for example I have the following list: list='(4 6) and I want to
transform it to this one list='(4 7).

There is a skill fonction which can do it: rplacd(name_liste
new_value) but it works only when I give the exact new_value, for
example i must tape
rplacd( list '(7))

Please help me because i must use it in a "for" fonction so the
incrementation must happen automatically ....

I've tried this but it didn't work:

y=nth( 1 list)+1
rplacd( list '(y))

it generate the following list: (4 y)

thanks a lot for the one who will help me


It's replacing the last element with the symbol y because that's what you
are telling it to do. The single quote in front of the open paren says
"don't evaluate symbols, pass them as is".

if you do:

y = nth( 1 list )+1
rplacd( list list(y) )

it will do what you are asking for, since the list function evaluates its
arguments.

The following will also work:

y = list( nth( 1 list )+1 )
rplacd( list y )

Your statement:

rplacd( list '(y) )

is equivalent to:

rplacd( list list( 'y ) )

-Pete Zakel
(phz@xxxxxxxxxxxxxxxx)

Felson's Law:
To steal ideas from one person is plagiarism; to steal from
many is research.
.

Relevant Pages

  • Re: updating the last element in a skill list
    ... nour writes: ... I want to update the last element in a skill list by incrementing it, ... There is a skill fonction which can do it: ... rplacd(list '(7)) ...
    (comp.cad.cadence)
  • updating the last element in a skill list
    ... I want to update the last element in a skill list by incrementing it, ... There is a skill fonction which can do it: ... example i must tape ... rplacd(list '(7)) ...
    (comp.cad.cadence)