local.derivative.ddtw {DTWBI} | R Documentation |

## Local derivative estimate to compute DDTW

### Description

This function estimates the local derivative of a vector. It can be used as an input in dtw() function (package dtw) to align two univariate signals.

### Usage

```
local.derivative.ddtw(X)
```

### Arguments

`X` |
input vector from which local derivative has to be calculated |

### Author(s)

Camille Dezecache, Hong T. T. Phan, Emilie Poisson-Caillault

### Examples

```
data(dataDTWBI)
X <- dataDTWBI[, 1]
local.derivative.ddtw(X)
# Plot
plot(X, type = "b", ylim = c(-1, 1))
lines(local.derivative.ddtw(X), col = "red")
```

[Package

*DTWBI*version 1.1 Index]