| regress, snellregress {Rvelslant} | R Documentation |
Finds the slownesses for layers given
the observed data and depth to boundaries. snellregress is the
same except that it uses the raypath calculated by
path4sl. The raypath is function of the slowness model, and so
this must be iterated to find a solution.
regress(z, tt, bot, theta = 0, hoffset = 0, wt = NULL, sig = NULL) snellregress(z, tt, bot, hoffset, wt = NULL, sig = NULL)
z |
array of depths of each travel time measurement. |
tt |
array of corresponding observed travel times. |
bot |
array of depth to layer bottoms. |
theta |
array of angles of incidence of the raypath for each layer. |
hoffset |
horizontal offset from the borehole. |
wt |
array of weights for the observations calculated from sig. |
sig |
the standard deviation of the observations. |
a list containing all the model parameters of the regression.
Eric M. Thompson <eric.thompson@tufts.edu>
Boore, D. M. (2003) A compendium of p- and s-wave velocities from surface-to-borehole logging: Summary and reanalysis of previously published data and analysis of unpublished data U.S. Geological Survey Open-File Report 03-191. Faraway, J. J. (2005) Linear Models with R Chapman & Hall/CRC.
snellregress, path4sl,
thetamatrix
# Used internally by Rvelslant()