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ptc-43548871-Visitor
1-Visitor
December 1, 2011
Solved

Having problems in given-find method

  • December 1, 2011
  • 2 replies
  • 1704 views

I am new to Mathcad and i am trying hard to learn it. Anyway, i have a homework about quadratic spline interpolation and i have ten equations with 12 unknowns. however, by using the given-find method i always get an error message. i desparately need your help to do my homework

my work is attached.

Best answer by Fred_Kohlhepp

You have a typographical error in one of your constraints, instead of t.5 you have t.5.

Beyond that,

  1. you need as many equations as unknowns for a unique solution.
  2. The extra equations come from requiring the slopes at the knots to be the same.

Read up in help on solve blocks with attention to "minerr".

2 replies

Fred_Kohlhepp23-Emerald IAnswer
23-Emerald I
December 1, 2011

You have a typographical error in one of your constraints, instead of t.5 you have t.5.

Beyond that,

  1. you need as many equations as unknowns for a unique solution.
  2. The extra equations come from requiring the slopes at the knots to be the same.

Read up in help on solve blocks with attention to "minerr".

    ptc-43548871-VisitorAuthor
    1-Visitor
    December 1, 2011

    I don't know how can i thank to you. You made my day. The mistake was in t.5. and i wouldn't be able to realise it without you. i am fed up with doing such silly but important mistakes.

    Thank you very much Fred Kohlhepp

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