mwinGrid {astrochron} | R Documentation |

## Determine 'dynamic moving window' for stratigraphic series, adjusting for changing sample density to maintain a window of constant duration; output on evenly spaced grid

### Description

Determine start and end points for a moving window of fixed duration (e.g. 500 kiloyears). The dynamic window allows for adjustment of the number of data points in the window, so it has a constant duration in time or space. This version will output an evenly spaced spatial/temporal grid.

### Usage

```
mwinGrid(dat,win,step,start=NULL,end=NULL,verbose=T)
```

### Arguments

`dat` |
Your data frame containing stratigraphic data; any number of columns (variables) are permitted, but the first column should be a location identifier (e.g., depth, height, time). |

`win` |
Moving window size in units of space or time. |

`step` |
Step size for moving window, in units of space or time. |

`start` |
Start moving window at what depth/height/time; by default will use first value |

`end` |
End moving window at what depth/height/time; by default will use last value |

`verbose` |
Verbose output? (T or F) |

### Details

This algorithm is similar to function mwin, but instead of stepping forward one stratigraphic datum at a time, it generates an evenly spaced spatial/temporal grid.

### Value

A data frame containing: Starting index for window, Ending index for window, Location (center)

### Examples

```
# generate some noise
ex1 <- ar1(npts=50,dt=1)
# jitter sampling times
ex1[1]=ex1[1]+rnorm(50,sd=0.25)
# sort
ex1 = ex1[order(ex1[,1],na.last=NA,decreasing=FALSE),]
# run mwin
mwinGrid(ex1,win=10,step=2)
```

*astrochron*version 1.3 Index]