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Topic: finding numerical roots of a polynomial in mathcad 7.0
Replies: 1   Last Post: Nov 4, 2000 2:07 AM

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 Leon Granowitz Posts: 16 Registered: 12/8/04
Re: finding numerical roots of a polynomial in mathcad 7.0
Posted: Nov 4, 2000 2:07 AM

Create a matrix M of n columns where each column contains the coefficients of a
polynomial to be solved. Then set a range index, say i := 0...n-1, and do
polyroots(M*), where * is the column operator (control 6). You then get the
answers in a matrix containing n matrices where each matrix has all the roots of
the applicable column vector. Use expand matrix to see the answers.

Leon Granowitz | leong@att.net

Daniel Pilloff wrote:

> Hi,
>
> Does anyone know how to use the polyroots function in mathcad 7.0 to find
> all of the roots of a polynomial when the coefficients are range variables?
> Example, find the roots of ax^4 + bx^3 + cx^2 + dx + e, where a, b, c, d,
> and e each range from 1 to 10. Also, does anyone know how to get MathCad to
> select only the positive real roots for each set of (a,b,c,d,e) to be used
> in a subsequent calculation?
>
> Thanks,
>
> Dan Pilloff
>
> --
> *******************************************
> Daniel Pilloff
> Albert Einstein College of Medicine
> *******************************************

--
Leon Granowitz | leong@att.net

Date Subject Author
9/25/00 Daniel Pilloff
11/4/00 Leon Granowitz