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+--- Thread: FOR IN {} suggestion for HP team (/thread-2472.html)
FOR IN {} suggestion for HP team - Gilles - 11-22-2014 01:59 PM
It would be fine to have this kind of syntax with the Prime like in Mapple :
FOR n IN { } DO
END
For example :
FOR n IN {"Bleu" "Blanc" "Rouge"} Do
PRINT(n);
END
would result in
Bleu
Blanc
Rouge
This will allow things like
FOR n IN { 1 7 3 9 10 11 } DO ..
And why not { 3..10} to give easily {3 4 5 6 7 8 9 10}
RE: FOR IN {} suggestion for HP team - lenborje - 12-01-2014 10:00 AM
In programming languages that use a for-construct to do list processing, the list is often not modifiable during the loop. I usually need to add elements to the list during processing, and thus use the pattern below:
LOCAL lst = { ... whatever .. };
WHILE SIZE(lst) DO
LOCAL element=head(lst);
lst:=tail(lst);
...
END;
RE: FOR IN {} suggestion for HP team - Tim Wessman - 12-01-2014 03:54 PM
Why would anyone ever want a loop in a programming language that iterates over a fixed sized collection of some type of object? I can't imagine how that would be useful nor any language that has something similar...
/s
RE: FOR IN {} suggestion for HP team - Han - 12-01-2014 04:15 PM
(12-01-2014 03:54 PM)Tim Wessman Wrote: Why would anyone ever want a loop in a programming language that iterates over a fixed sized collection of some type of object? I can't imagine how that would be useful nor any language that has something similar...
/s
I think the idea was not to actually loop over a fixed sized list, but to simply enable looping over lists so that one could do something like:
Code:
FOR j IN mylist DO
PRINT(j);
END;where mylist is created dynamically.
RE: FOR IN {} suggestion for HP team - ndzied1 - 12-01-2014 06:17 PM
perhaps the /s means sarcasm off...
RE: FOR IN {} suggestion for HP team - parisse - 12-01-2014 06:41 PM
I agree with Han, iteration over a list is useful (it is the standard way to make loops in python by the way), and it is implemented in Xcas (with maple-like syntax).
RE: FOR IN {} suggestion for HP team - Gilles - 12-01-2014 06:51 PM
Python for example :
Code:
fruits = ['banana', 'apple', 'mango']
for fruit in fruits:
print 'Current fruit :', fruitOr Mapple :
Code:
chiffres := {1, 2, 3, 4, 5, 6, 7, 8, 9};
for a in chiffres do
for b in chiffres minus {a} do
for c in chiffres minus {a, b} do
.
.
.
end do end do end do;Or Ada, C, D, Delphi, Pascal, PHP,Perl , etc etc etc :
http://en.wikipedia.org/wiki/Foreach_loop
Of course the idea was not to be limited to fixed list...
RE: FOR IN {} suggestion for HP team - Han - 12-01-2014 06:54 PM
(12-01-2014 06:17 PM)ndzied1 Wrote: perhaps the /s means sarcasm off...
Ha! It went completely over my head! <blush>