Carry out nodal modulation calculations for
tidem(). This function is based directly
t_vuf in the
T_TIDE Matlab package (Pawlowicz et al., 2002),
which inherits from the Fortran code described by Foreman (1978).
tidemVuf(t, j, latitude = NULL)
a single time in
POSIXct() format, with timezone
integer vector, giving indices of tidal constituents to use.
optional numerical value containing the latitude in degrees North.
If not provided,
u in the return value will be a vector consisting of
repeated 0 value, and
f will be a vector of repeated 1 value.
f as described in the
as well in Pawlowicz et al. (2002) and Foreman (1978).
Foreman, M. G. G., 1978. Manual for Tidal Currents Analysis and Prediction. Pacific Marine Science Report. British Columbia, Canada: Institute of Ocean Sciences, Patricia Bay.
Pawlowicz, Rich, Bob Beardsley, and Steve Lentz, 2002. Classical tidal
harmonic analysis including error estimates in MATLAB using
Computers and Geosciences, 28, 929-937.