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Solver Help: Setting a Constraint to Allow Two Values

  1. #1
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    Solver Help: Setting a Constraint to Allow Two Values

    Hello,

    I am designing a bond amortization table. I am trying to constrain the principal payments, lets call them A1:A8 to be either $5,000 difference from the previous payment, or $0 difference from the previous payment. I cannot find the correct syntax to set a constraint that does the following. Assuming B2:B8 are the difference values.

    Constraint:
    B1:B8 = ($5,000 or 0)

    Im guessing this is probably a simple error and I am overlooking an easy formula. But I would appreciate any help I could get.

    Thanks

  2. #2
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    Re: Solver Help: Setting a Constraint to Allow Two Values

    It's not the kind of problem I usually solve. I would be tempted to use a couple of helper cells:

    In one cell, put 5000
    In C1:C8 (or A1:A8 or wherever is convenient) put 0 (or 1).
    B1:B8 might be 5000*A1 (copied across).
    In your Solver model, include A1 to A8 in your by changing cells, and add a constraint that those cells are bin (binary -- meaning Solver will force them to be 0 or 1)

    When B1 is 0, the difference will be 0, when B1 is 1, the difference will be 5000.

    See if something like that will work.
    Quote Originally Posted by shg
    Mathematics is the native language of the natural world. Just trying to become literate.

  3. #3
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    Re: Solver Help: Setting a Constraint to Allow Two Values

    Solution worked great. Ended up tweaking it a bit to allow increments of 5,000 using integers as opposed to binary. Appreciate the help.

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