# Interpolation

From AMS Glossary

## interpolation

The estimation of unknown intermediate values from known discrete values of a dependent variable.

Various methods are available in one dimension for fitting polynomials or other functions to the known points, the elaborateness of the technique used depending on (among other things) the number and accuracy of the known values. The analysis of a weather chart is an interpolation and smoothing in two dimensions.

*Compare*extrapolation.