[CalmoSoft]

Hello Thomas et All,

I want to test the speed of Visual Prolog with two dimensional array (4000x4000 items)
I want to store to indices: array(i,j) = i*j
Can you post me a sample?

Greetings,
Gal Zsolt
(~ CalmoSoft ~)

[Harrison Pratt]

The "Game of Life" I posted in Visual Prolog Tips & Samples uses a 2D matrix.

http://discuss.visual-prolog.com/viewto ... 52674c8555

[CalmoSoft]

Hello Harrison,

Thanks for your useful help.
I look at it.

Greetings,
Gal Zsolt
(~ Calmosoft ~)

[CalmoSoft]

Hello Harrison et All,

I need your help.
I can not write the code.
Can you help me?

Greetings,
Gal Zsolt
(~ Calmosoft ~)

[Harrison Pratt]

Hi Gal,
I don't understand what you mean by "I can not write the code."
Were you able to look at the Game of Life (GOL) code?
Do you need a very simple example of using a 2D matrix?

[CalmoSoft]

Hello Harrison,

Yes, I need a very simple example of using a 2D matrix.

Greetings,
Gal Zsolt
(~ CalmoSoft~)

[Harrison Pratt]

Code: Select all

class predicates
    demo : ().
clauses
    demo() :-
        % create matrix
        Rows = 100,
        Cols = 100,
        Matrix2D = array2M::newInitialize(Rows, Cols, 0),
        % insert some values
        Matrix2D:set(0, 0, 11),
        Matrix2D:set(0, 1, 22),
        % retrieve some values
        ValueA = Matrix2D:get(0, 0),
        ValueB = Matrix2D:get(0, 1),
        % how big?
        SizeX = Matrix2D:sizeX, % note that sizeX and sizeY are properties
        SizeY = Matrix2D:sizeY,
        % get all non-zero values; note that keys are stored as tuples(Row,Col)
        VV =
            [ V ||
                tuple(tuple(R, C), V) = Matrix2D:getAll_nd(),
                V <> 0
            ].

Look at the collection class Help file for more info.

You should run this sample code in a simple console application and use the debugger to look at the data structures that are used.

[CalmoSoft]

Hello Harrison,

Thanks for your useful help.
I try to use them.

Greetings,
Gal Zsolt
(~ CalmoSoft ~)

[CalmoSoft]

Hello Harrison,

I hope I have the last question.
I want to use nested loops like this in Ring language:

array = newlist(4000,4000)
for n= 1 to 4000
for m= 1 to 4000
array[n][m] = n*m
next
next

Greetings,
Gal Zsolt
(~ CalmoSoft ~)

[Harrison Pratt]

You are infinitely more expert in Ring than I am.

[Thomas Linder Puls]

array2M has 0-based indices. But if you ignore the 0 indices and just make the array one larger at each dimension then you can use 1-based indices.
The initialization code can look like this:

Code: Select all

        Size = 4000,
        Array = array2M::new(Size + 1, Size + 1),
        foreach N = std::fromTo(1, Size) do
            foreach M = std::fromTo(1, Size) do
                Array:set(N, M, N * M)
            end foreach
        end foreach

If you like you can also combine the iteration into a single foreach:

Code: Select all

        Size = 4000,
        Array = array2M::new(Size + 1, Size + 1),
        foreach N = std::fromTo(1, Size) and M = std::fromTo(1, Size) do
            Array:set(N, M, N * M)
        end foreach

[CalmoSoft]

Hello Thomas,

Thanks for your useful help.
I will use them.

Greetings,
Gal Zsolt
(~ CalmoSoft ~)