# RfPhi: Determine Rs and corresponding parameters following the RfPhi... In RockFab: Rock Fabric and Strain Analysis Tools

 RfPhi R Documentation

## Determine Rs and corresponding parameters following the RfPhi method

### Description

This function applies the RfPhi technique to object data following a Chi squared statistical test for the most uniform distribution of object orientations.

### Usage

```RfPhi(my.par, out.file, section.title, weight.vec = TRUE, unit.area = "px")
```

### Arguments

 `my.par` A data frame object returned by `ParEx` or `RfPhiParRead`. `out.file` Path to PDF file where a standardized plot of the sectional results is made. `section.title` Title of the sectional analysis. `weight.vec` Logical, if TRUE an eccentricity weighting is applied such that more elliptical objects influence the vector mean stronger than objects with more circular shapes. `unit.area` The unit of measure in which the mean object area is calculated. If, for example, the input data is returned from `ParEx` the unit is in pixels; however, if manual data is used, the unit used to measure axial lengths should be used.

### Value

Function creates a standardized PDF file containing an RfPhi plot, sectional Rs ellipse, Chi square plot, and a list of calculated properties. These properties are also returned via an object of class `RFPHI`.

### Author(s)

Jeffrey R. Webber

### References

Dunnet, D. (1969). A technique of finite strain analysis using elliptical particles.

Ramsay, J. (1969). Folding and fracturing of rocks.

Lisle, R. (1985). Geological strain analysis, a manual for the rf/phi method.

Mulchrone, K. and P. Meere (2001). A windows program for the analysis of tectonic strain using deformed elliptical markers.

Mookerjee, M. and S. Nickleach (2011). Three-dimensional strain analysis using Mathematica.

`FryData`, `FryNormData`, `FrySelect`