# Movslope

Movslope-func

## Description

movslope(vx, vy[, n]) function returns a vector to calculate the moving slope at each point with a window width of **n** and (**n**-1)/2 points on either side of the point.

The slope at point i with a width of k is:

Where , , and

## Syntax

vector movslope(vx, vy[, n])

## Parameters

**vx**

- Input vector for independent variable

**vy**

- Input vector for dependent variable

**n**

- Input integer for window width
**n** should be an integer greater than 1. If **n** is an even number, it will be set to **n+1** internally. When **n** is omitted, the function returns a vector of one value which is the linear fit slope of the input.

## Return

Return the moving slopes at each point with a window width of **n**.

The first and last (**n**-1)/2 points of the output vector are missing values.

**Note**: If there are missing values in **vx** or **vy**, the slopes related to these points in the **n** window will be missing values. If a slope is infinite, it will be shown as a missing value.

## Example

//Col(C) will be filled with slopes at each points.
//First and last two cells are missing values.
col(C)=movslope(col(A),col(B),5);

//Col(C) only has a numeric cell, which is the slope for all the points.
col(C)=movslope(col(A),col(B));

## See Also

Diff