Windows and MATLAB programs for determining the optimal strain and its 95% 
error from Rf/phi data contained in a textfile using the hyperbolic vector 
mean method (Yamaji, 2008). 

***** List of Files ********************************************************
hStrain.exe       Excecutable file compatible with Windows Vista and later
                  for determining the optimal strain and its 95% error from
                  Rf/phi data

hStrain.m         The main MATLAB program for determining the optimal strain 
                  and its 95% error
EqualAreaProjection_from_H2vec.m MATLAB function M-file called from hStrain.m
HyperbolicDistance.m             MATLAB function M-file called from hStrain.m
HyperbolicInnerProd.m            MATLAB function M-file called from hStrain.m
rhopsi2Rphi.m                    MATLAB function M-file called from hStrain.m
rhopsi2vec.m                     MATLAB function M-file called from hStrain.m
Rphi2rhopsi.m                    MATLAB function M-file called from hStrain.m
vec2rhopsi.m                     MATLAB function M-file called from hStrain.m

sample_image.tif  Binary image of deformed elliptical markers
markers_ID.jpg    JPEG image of the ID numbers of the markers 
                  output from ImageJ
a_b_phi.txt       The major- and minor-axes and phi values of the 
                  ellipses fitted to the markers by ImageJ
result_a_b_phi.jpg  JPEG file containing the equal-area projection output from
                  hStrain.exe and finished up by Adobe Illustrator
sampledataKM.txt  sample data
result_sampledataKM.jpg JPEG file containing the equal-area projection output 
                  from hStrain.exe and finished up by Adobe Illustrator
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REFERENCES
Yamaji, A. (2008) Theories of strain analysis from shape fabrics: A perspective using hyperbolic geometry. Journal of Structural Geology, 30, 1451-1465. doi:10.1016/j.jsg.2008.07.011