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Evaluate polynomial

Evaluates a polynomial (either a poly or a vector) at a number

(2050 downloads for this version - 2050 downloads for all versions)

Details

Version

1.0

Author

david adams

Maintainer

david adams

Category

Numerical Maths

License

BSD (4.4)

Supported Scilab Version

5.3

Creation Date

March 20, 2011

Description

            Evaluates a polynomial (either a poly or a vector) at a number

//------------------------------------------------------------
// Function: evalpoly - evalutes a polynomial at a given value
//
// Input: p - a polynomial or a vector with coeff (a0, a1, a2,..)
//        x - a number
// Output: r - the value of the polynomial evaluated at x
//------------------------------------------------------------

Files (1)

[800 bytes]

evalpoly.sci

Miscellaneous file

Scilab script

Upload date : 2011-03-20 21:08:04
MD5         : 55d352fd93070d0380d3efdc83237052
SHA1        : 646cd1bb8db729e30d3e79afc09af27aebe4576d
Downloads   : 2050

News (0)

Comments (3) ↑ Leave a comment

Comment from Samuel Gougeon -- March 22, 2011, 09:36:50 PM

Hi David,
Did you compare evalpoly() to the existing horner() embedded function?
Regards
Samuel

Comment from david adams

-- March 22, 2011, 09:39:51 PM

1. The Horner function was hard enough to find because of its bizarrely cryptic name
2. I didn't like the coding in the horner function, I wanted a function that did exactly
what I needed.
3. What does the file exchange have to do with current Scilab functions - nothing.

Comment from A. Khorshidi -- July 10, 2013, 12:17:08 PM

Hi;
I see a little wrong in your coding. In line 25, the variable "p" must be
substituted with
"C"  and then move this expression after the last END. 
Correct:
[...]
// n = size(p,"*") // remove from here
C = p;
end
n = size(C,"*")  // add to this line
v = C.*x^(0:(n-1))
[...]
Thanks, 
Mehran