polyval

y = polyval(p::AbstractArray, x::Union{AbstractArray, Number})

Evaluates the polynomial p at each point in x. The argument p is a vector of length n+1 whose elements are the coefficients (in ascending order of powers) of an nth-degree polynomial:

\[p(x) = p[1] + p[2]x + p[3]x^2 + \ldots + p[n+1]x^n\]

The polynomial coefficients in p can be calculated by functions like polyfit, but you can specify any vector for the coefficients.

Examples

Evaluate the polynomial \(p(x)=3x^2 +2x + 1\) at the points x=5,7,9. The polynomial coefficients can be represented by the vector [1, 2, 3].

using GMT

p = [1, 2, 3];
x = [5, 7, 9];
y = polyval(p, x)

3-element Vector{Int64}:
  86
 162
 262

Source Code

View the source code for this function.

Examples

Source Code

See Also