# [eclipse-clp-users] Dynamic List/ Array

From: Edgaonkar, Shrirang <Shrirang.Edgaonkar_at_...390...>
Date: Wed, 3 Dec 2014 07:58:48 +0000
```Dear CLP users,

I have the following array. I need to know if we are able to insert new variables in the array or have constraints on the existing variables.

M = []([](2, 3, 5, _), [](1, 4, 7, _)),

After inserting new variables, the output should be as follows for example.

M = []([](2, 3, 5, _, 34), [](1, 4, 7, _, 87)),

34 and 87 have no relation with existing data in array. They are just hard coded numbers.

The following is the way I need to add the constraint for the array.

M[1, 4] + M[2, 4] #= 10,

%Search API to solve the above constraint..

and provide solution as

M = []([](2, 3, 5, 2, 34), [](1, 4, 7, 8, 87)),

Please let me know if this is possible.

I have tried and understood about list/array.

Following are some of my samples. They have nothing to do with my question in particular.

:-lib(ic).

:- local struct( others(dvds, ratings) ).
:- local struct( see(others, stars) ).
:- local struct( book(author, title, year, publisher, cost, details, see) ).

top(M):-

M = []([](2, 3, 5, _), [](1, 4, 7, _)),
A is M[1, 2] + M[2, 3],
% Reading from array
writeln("Reading from array"),
writeln(A),

B #= 2,

D is M[B, 2] + M[2, 3],
% Reading from array with index as variable
writeln("Reading from array with index as variable"),
writeln(D),

E is M[B, 2] * M[2, 3],
% Reading from array with arithmetic operation
writeln("Reading from array with arithmetic operation"),
writeln(E),

% Reading from array with arithmetic operation
writeln("Reading from array with arithmetic operation"),
writeln(M[B, 2]),

M[1,4] #= 5,
writeln("Writing to array"),
writeln(M[1,4]),

%writeln("Modifying existing array"),
%writeln(M[1,1]),

writeln("Reading from list  and inserting in a new list with arithmetic operation"),
( foreach(X,[1,2,3]), foreach(Y,List) do Y is X + 3 ),
writeln(List),

( foreach(List,), foreach(Y,List) do Y is X + 3 ),
writeln(List).

Thanks and Regards,

Shrirang Edgaonkar

________________________________
From: Edgaonkar, Shrirang
Sent: 21 November 2014 10:05:36
To: eclipse-clp-users_at_...105...
Subject:

Dear Eclipse users group,

I am working on solving constraints based on real numbers. Following is the sample code with all the constraints and locate API to find the solution.

:- module(test).
:- export hello/0.
:-lib(ic).

hello :-

A :: -9223372036854775808.0__9223372036854775807.0,
B :: -9223372036854775808.0__9223372036854775807.0,
C :: -9223372036854775808.0__9223372036854775807.0,
D :: -9223372036854775808.0__9223372036854775807.0,

A \$> B,
B \$< C,
B + C \$= 78,
((D - B) * 45) / A \$= 123.35,

locate([A, B, C, D], 1e-1, lin),

writeln(a=[A]),
writeln(b=[B]),
writeln(c=[C]),
writeln(d=[D]),
writeln("%%%%%%%%%%%%%%%%%%%%%%%%%").

Following is the output but the output is always in ranges and I need solution that is a single set of real numbers. Please help me on how can I achieve this.

Output

a = [_436{16.8253096002924 .. 17.8537558438417}]
b = [_575{16.8253096002924 .. 17.8537558438417}]
c = [_714{60.1462441561583 .. 61.1746903997076}]
d = [_853{62.9453526935382 .. 66.7928843624611}]
%%%%%%%%%%%%%%%%%%%%%%%%%

Thanks and Regards,

Shrirang Edgaonkar

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Received on Wed Dec 03 2014 - 08:20:07 CET

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