# Interpolate Extrapolate

See more related video:Origin VT-0010 Interpolation

## Description

Interpolation is a method of estimating and constructing new data points from a discrete set of known data points. This function generates uniform linear spaced interpolated curve by three methods: Linear, Cubic spline and Cubic B-spline.

To use this function:

1. Create a new worksheet with input data.
2. Select Analysis: Mathematics: Interpolate/Extrapolate. This opens interp1XY dialog.

In fact, the interpxy X-Function is called to complete the calculation.

## Dialog Options

Input Specifies the XY range to be interpolated. Specify the interpolation/extrapolation method. Linear Linear interpolation is a fast method of estimating a data point by constructing a line between two neighboring data points. The resulting point may not be an accurate estimation of the missing dat. Cubic Spline This method splits the input data into a given number of pieces, and fits each segment with a cubic polynomial. The second derivative of each cubic function is set equal to zero. With these boundary conditions met, an entire function can be constructed in a piece-wise manner. Cubic B-Spline This method also splits the input data into pieces, each segment is fitted with discrete Bezier splines. Specifies the number of interpolated points. The minimum X value of interpolated curve. The maximum X value of interpolated curve. It is available only when the interpolation is performed on a graph. It specifies whether to use the apparent values for interpolation if the types of the axes scales have been changed to other types. Specifies the output XY data range

## Algorithm

Detail algorithms please refer to the help of Interpolate Extrapolate Y from X