how to sort numeric

Katja_hbg · 10-09-2022, 08:43 AM

Inspired from a thread «how to search for only the first occurency ...», I tried something like «oldes book of an author»... and I made it ... almost.

As «oldest» is referring to my library, I search for that book with the lowest id of an author. I search book by author and sort them by id. But that sorting is alphabetic and therefore 1060 comes before 888.

In a template search I use
...
books_of_author = book_values ('id', searchstring, ',' , 99) ;
list_split (list_sort (books_of_author, 0, ','), ',', 'book_of_author_id');
...

Can someone help, to get the list of ids ordered numeric?

chaley · 10-09-2022, 10:51 AM

There is no numeric list sort in GPM templates. However, you can get the same effect by formatting the numbers with leading zeros, as in

Code:

program:
	ids = book_values('id', 'series:true', ',', 0);
	new_ids = '';
	for id in ids:
		new_ids = new_ids & format_number(id, '04d') & ','
	rof;
	list_sort(new_ids, 0, ',')

However, I suspect you are sorting to find the minimum. If so then instead of rebuilding and sorting the list you could do

Code:

program:
	ids = book_values('id', 'series:true', ',', 0);
	minimum = 9999999999;
	for id in ids:
		if id <# minimum then
			minimum = id
		fi
	rof;
	minimum

Katja_hbg · 10-09-2022, 01:07 PM

Thanks Chaley,
I take the second suggestion and now all looks good.

10-09-2022, 08:43 AM	#1
Katja_hbg Groupie Posts: 183 Karma: 158116 Join Date: Oct 2015 Device: Kobo Glo HD (landscape), Kobo Aura One	how to sort numeric Inspired from a thread «how to search for only the first occurency ...», I tried something like «oldes book of an author»... and I made it ... almost. As «oldest» is referring to my library, I search for that book with the lowest id of an author. I search book by author and sort them by id. But that sorting is alphabetic and therefore 1060 comes before 888. In a template search I use ... books_of_author = book_values ('id', searchstring, ',' , 99) ; list_split (list_sort (books_of_author, 0, ','), ',', 'book_of_author_id'); ... Can someone help, to get the list of ids ordered numeric?

10-09-2022, 10:51 AM	#2
chaley Grand Sorcerer Posts: 12,447 Karma: 8012886 Join Date: Jan 2010 Location: Notts, England Device: Kobo Libra 2	There is no numeric list sort in GPM templates. However, you can get the same effect by formatting the numbers with leading zeros, as in Code: program: ids = book_values('id', 'series:true', ',', 0); new_ids = ''; for id in ids: new_ids = new_ids & format_number(id, '04d') & ',' rof; list_sort(new_ids, 0, ',') However, I suspect you are sorting to find the minimum. If so then instead of rebuilding and sorting the list you could do Code: program: ids = book_values('id', 'series:true', ',', 0); minimum = 9999999999; for id in ids: if id <# minimum then minimum = id fi rof; minimum

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10-09-2022, 01:07 PM	#3
Katja_hbg Groupie Posts: 183 Karma: 158116 Join Date: Oct 2015 Device: Kobo Glo HD (landscape), Kobo Aura One	Thanks Chaley, I take the second suggestion and now all looks good.

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