# Movavg

Movavg-func

## Description

This function returns the moving average of adjacent ranges [i-nb, i+nf], for a point i. The part of range beyond the input vector is dropped.

The adjacent average at point i with iback backward offset and iforw forward offset is:

## Syntax

vector movavg(vector vx, int back, int forward)

## Parameters

**vx**

- The data vector used to calculate adjacent average.

**back**

- is the offset backward with respect to current row number.

**forward**

- is the offset forward with respect to current row number.

## Return

Return the adjacent average vector.

## Example

// Col(2) will be filled with adjacent value at each point. Note that
// col(2)[9] = (col(1)[9]+col(1)[10])/2 and col(1)[10] = col(2)[10]
for(ii=1;ii<=10;ii++) col(1)[ii] = ii;
col(2)=movavg(col(1),0, 2);

// The subrange [10:20] in col(2) will be filled with adjacent average
// of the given subrange [10:20] in col(1).
range aa=col(1)[10:20];
range bb=col(2)[10:20];
bb = movavg(aa, 3, 3);