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https://issues.apache.org/jira/browse/MATH-246?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12689539#action_12689539
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Ben McCann commented on MATH-246:
---------------------------------
That constructor was made so that constraints such as x + 2y <= 3x + 4y could
be expressed instead of just scalars on the right hand side (x + 2y <= 9). The
user doesn't have to care about the implementation details which cause one side
to be subtracted from the other, but only needs to know how to express their
constraint. I actually would propose a different change to the constructor,
which would be to change it to:
public LinearEquation(RealVector leftHandSide, double lhsConstantTerm,
Relationship relationship, RealVector rightHandSide, double rhsConstantTerm)
That would make it more flexible and allow for constraints such as x + 2y + 7
<= 3x + 4y + 6 which I originally overlooked. You're correct that the user
could do this him/herself, but it seems a common use case (one I will be using
frequently to say the least), so I thought it wise to provide the extra
convenience.
And perhaps adding some JavaDocs would clear up any potential confusion that I
had not envisioned:
/**
* @param leftHandSide The coefficients of the linear expression on the left
hand side of the constraint
* @param lhsConstantTerm The constant term of the linear expression on the
left hand side of the constraint
* @param relationship The type of (in)equality used in the constraint
* @param rightHandSide The coefficients of the linear expression on the right
hand side of the constraint
* @param rhsConstantTerm The constant term of the linear expression on the
right hand side of the constraint
*/
> Simplex Method Implementation
> -----------------------------
>
> Key: MATH-246
> URL: https://issues.apache.org/jira/browse/MATH-246
> Project: Commons Math
> Issue Type: New Feature
> Reporter: Benjamin McCann
> Assignee: Luc Maisonobe
> Fix For: 2.0
>
> Attachments: newfiles.zip
>
>
> I've created an implementation of the Simplex algorithm for optimizing
> systems of constrained linear equations that I'd like to contribute.
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