# tend-anplot - Man Page

graph anisotropy metric in barycentric coords

## Synopsis

**tend anplot** [**-r** <*res*>] [**-w**] [**-hflip**] [**-nan**] **-a** <*aniso*> [**-o** <*nout*>]

## Description

Graph anisotropy metric in barycentric coordinates. The metrics all vary from **0.0** to **1.0**, and will be sampled in the lower right half of the image. The plane on which they are sampled is a surface of constant trace. You may want to use

unu resample -s = x0.57735 -k tent

to transform the triangle into a 30-60-90 triangle, and

ilk -t 1,-0.5,0,0,0.866,0 -k tent -0 u:0,1 -b pad -bg 0

(possibly followed by **teem/src/limntest/triimg**) to transform the domain into an equilateral triangle.

## Options

- -res <
*res*> resolution of anisotropy plot (

*int*); default: “**256**”- -w
sample the whole triangle of constant trace, instead of just the sixth of it in which the eigenvalues have the traditional sorted order.

- -hflip
flip the two bottom corners (swapping the place of linear and planar)

- -nan
set the pixel values outside the triangle to be

**NaN**, instead of**0**- -a <
*aniso*> Which anisotropy metric to plot. All the Westin metrics come in two versions. Currently supported:

- “
**cl1**”, “**cl2**”: Westin’s linear - “
**cp1**”, “**cp2**”: Westin’s planar - “
**ca1**”, “**ca2**”: Westin’s linear + planar - “
**cs1**”, “**cs2**”: Westin’s spherical - “
**ct1**”, “**ct2**”: GK’s anisotropy type (cp/ca) - “
**ra**”: Basser/Pierpaoli relative anisotropy/sqrt(2) - “
**fa**”: Basser/Pierpaoli fractional anisotropy - “
**vf**”: volume fraction = 1-(Basser/Pierpaoli volume ratio) - “
**tr**”: trace

- “
- -o <
*nout*> output image (floating point) (

*string*) default: “**-**”