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poly, polyl

Header File

math.h

Category

Math Routines

Prototype

double poly(double x, int degree, double coeffs[]);

long double polyl(long double x, int degree, long double coeffs[]);

Description

Generates a polynomial from arguments.

poly generates a polynomial in x, of degree degree, with coefficients coeffs[0], coeffs[1], ..., coeffs[degree]. For example, if n = 4, the generated polynomial is:

polyl is the long double version; it takes long double arguments and returns a long double result.

Return Value

poly and polyl return the value of the polynomial as evaluated for the given x.

Example

Copy Code

    #include <stdio.h>
    #include <math.h>
    /* polynomial:  x**3 - 2x**2 + 5x - 1 */
    int main(void)
    {
      double array[] = { -1.0, 5.0, -2.0, 1.0
    };
      double result;
      result = poly(2.0, 3, array);
      printf("The polynomial: x**3 - 2.0x**2 + 5x - 1 at 2.0 is %lf\n", result);
      return 0;
    }

Portability

| POSIX | Win32 | ANSI C | ANSI C++
poly |  | + |  |
polyl |  | + |  |

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