search for: polyval

Displaying 3 results from an estimated 3 matches for "polyval".

Did you mean: pol_val
2004 Aug 09
1
returns the value of a polynomial of degree n evaluated at x.
> Background: > OS: Linux Mandrake 9.1 > release: R 1.9.0 > editor: Xemacs 21.4 > frontend: ESS 5.1.23 > --------------------------------- > > Colleagues > Is there a function in R that is similar to polyval in matlab? (y = polyval(p,x) returns the value of a polynomial of degree n evaluated at x. The input argument p is a vector of length n+1 whose elements are the coefficients in descending powers of the polynomial to be evaluated). <http://www.mathworks.com/access/helpdesk/help/techdoc/ref/polyva...
2007 Aug 15
1
Polynomial fitting
...ients of a polynomial p(x) of degree m that fits the data, p(x[i]) to y[i], in a least squares sense. The result c is a vector of length m+1 containing the polynomial coefficients in descending powers: p(x) = c[1]*x^n + c[2]*x^(n-1) + ... + c[n]*x + c[n+1] For prediction, one can then use function polyval like the following: y0 = polyval( polyfit( x, y, degree ), x0 ) y0 are the prediction values at points x0 using the given polynomial. In R, we know there is lm for 1-degree polynomial: lm( y ~ x ) == polyfit( x, y, 1 ) and for prediction I can just create a function like: lsqfit <- function(...
2004 Aug 09
0
returns the value of a polynomial of degree n evaluated a t x.
...(PIRSA-SARDI) > > > Background: > > OS: Linux Mandrake 9.1 > > release: R 1.9.0 > > editor: Xemacs 21.4 > > frontend: ESS 5.1.23 > > --------------------------------- > > > > Colleagues > > > Is there a function in R that is similar to polyval in matlab? (y = > polyval(p,x) returns the value of a polynomial of degree n > evaluated at x. > The input argument p is a vector of length n+1 whose elements are the > coefficients in descending powers of the polynomial to be evaluated). > <http://www.mathworks.com/access/helpde...