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# Copyright (C) 2010, 2009 Oscar Perpiñán Lamigueiro
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#/
fSombraHoriz<-function(angGen, distances, struct){
stopifnot(is.list(struct),is.data.frame(distances))
###Preparo datos de partida
distances=distances/struct$L
AzS=angGen$AzS
AlS=angGen$AlS
Beta=angGen$Beta
lew=distances$Lew #Debe estar previamente normalizada
###Cálculos
Beta0=atan(abs(sin(AzS)/tan(AlS)))
FS=1-lew*cos(Beta0)/cos(Beta-Beta0)
SombraCond=(FS>0)
###Resultado
FS=FS*SombraCond
FS[FS>1]<-1
return(zoo(FS, index(angGen)))
}
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