Important: The interp function has been deprecated. Use the superseding command CurveFitting[PolynomialInterpolation] instead. A call to interp automatically generates a call to CurveFitting[PolynomialInterpolation].

The interp function computes the polynomial of degree less than or equal to n in the variable v which interpolates the points $x_1,y_1$, $x_2,y_2$, ..., $x_{n+1},y_{n+1}$.

If the same x-value is entered twice, it is an error, whether or not the same y-value is entered; all independent values must be distinct.

$\mathrm{interp}\left(\left[0\,1\,2\,3\right]\,\left[0\,3\,1\,3\right]\,z\right)$

$\frac{3}{2}{z}^3-7z^2+\frac{17}{2}z$