Robert Cummings wrote:
On Tue, 2007-10-09 at 15:28 -0500, Jay Blanchard wrote:
[snip]
This *IS* the knapsack problem. Just because you specify date ranges
to get your values and the value isn't a knapsack doesn't change the
fact that it is the same problem :) I remember having fun with
On 09/10/2007, Jay Blanchard [EMAIL PROTECTED] wrote:
Good afternoon gurus and guru-ettes!
I am searching for an algorithm that will take a list of monetary values
and determine which of these values totals a value supplied to the
widget.
1. I supply a value to the application and give a
[snip]
it is a special case of the knapsack problem - the subset sum problem.
You'll need to be aware that it's of exponential complexity. So make
sure your lists of possible values don't get big. Anyway, here's my
answer:
[/snip]
Thanks to all who responded, some very cool solutions and some
On Wed, 2007-10-10 at 07:00 -0500, Jay Blanchard wrote:
There is another ongoing thread about OOP in PHP4 that has approached
holy war status. I fear that some are overlooking solutions to problems
that already have been solved. Things such as interfaces and design
patterns exist because they
Subject: Re: [PHP] Looking for help with a complex algorithm
Jay Blanchard wrote:
[snip]
what is it suppose to return if it cannot find records that the exact
total do not match the total
you are looking for? should it return nothing?
[/snip]
Correct. It should say
[snip]
If the OP wants any single valid set, then this seems to work.
If he wants all valid sets, no joy.
I added a 10.00 and a 0.22 to the $values array and varied the position
of the 10.00 (before and after 3.76) and it seems to pull the first set
where the first member in the $values array is a
Good afternoon gurus and guru-ettes!
I am searching for an algorithm that will take a list of monetary values
and determine which of these values totals a value supplied to the
widget.
1. I supply a value to the application and give a date range
2. The application will query for all of the
Date: Tue, 9 Oct 2007 14:01:30 -0500
From: [EMAIL PROTECTED]
To: php-general@lists.php.net
Subject: [PHP] Looking for help with a complex algorithm
Good afternoon gurus and guru-ettes!
I am searching for an algorithm that will take a list of monetary values
and determine which
And that is when I realize how much more I still need to learn about
php...
On Oct 9, 2007, at 3:01 PM, Jay Blanchard wrote:
Good afternoon gurus and guru-ettes!
I am searching for an algorithm that will take a list of monetary
values
and determine which of these values totals a value
On Tue, 2007-10-09 at 14:01 -0500, Jay Blanchard wrote:
Good afternoon gurus and guru-ettes!
I am searching for an algorithm that will take a list of monetary values
and determine which of these values totals a value supplied to the
widget.
1. I supply a value to the application and give
[snip]
This *IS* the knapsack problem. Just because you specify date ranges to
get your values and the value isn't a knapsack doesn't change the fact
that it is the same problem :) I remember having fun with genetic
algorithms and the knapsack problem back in University.
[/snip]
You're right save
On 10/9/07, Jay Blanchard [EMAIL PROTECTED] wrote:
[snip]
This *IS* the knapsack problem. Just because you specify date ranges to
get your values and the value isn't a knapsack doesn't change the fact
that it is the same problem :) I remember having fun with genetic
algorithms and the
On Tue, 2007-10-09 at 15:28 -0500, Jay Blanchard wrote:
[snip]
This *IS* the knapsack problem. Just because you specify date ranges to
get your values and the value isn't a knapsack doesn't change the fact
that it is the same problem :) I remember having fun with genetic
algorithms and the
I never heard of the knapsack problem before this post.
But the w in the w*x terms appear to be 1, and he seems to want an exact value,
not less than or equal to.
I think my brute force factorial technique is a solution, but dynamic
programming may be more efficient? Not familiar with DP
CC: php-general@lists.php.net
From: [EMAIL PROTECTED]
Date: Tue, 9 Oct 2007 15:58:22 -0400
To: [EMAIL PROTECTED]
Subject: Re: [PHP] Looking for help with a complex algorithm
And that is when I realize how much more I still need to learn about
php...
IMHO, I don't think this has anything
[snip]
So imagine the value of all of your items is equal to it's size. Voila,
same problem.
[/snip]
Got it. I was focused to much on the forest and not the trees.
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Jay Blanchard wrote:
Good afternoon gurus and guru-ettes!
I am searching for an algorithm that will take a list of monetary values
and determine which of these values totals a value supplied to the
widget.
1. I supply a value to the application and give a date range
2. The application will
[snip]
what is it suppose to return if it cannot find records that the exact
total do not match the total
you are looking for? should it return nothing?
[/snip]
Correct. It should say that there are no records that generate a match.
--
PHP General Mailing List (http://www.php.net/)
To
Jay Blanchard wrote:
[snip]
what is it suppose to return if it cannot find records that the exact
total do not match the total
you are looking for? should it return nothing?
[/snip]
Correct. It should say that there are no records that generate a match.
Ok, so based off what you were
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