[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
ists.php.net
> 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 not
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
[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 m
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 g
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 wi
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 aski
[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.
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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 quer
[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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> 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 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 alth
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 th
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 k
[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 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
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 sup
> 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 o
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