R/seq.R

In abrem: Abernethy Reliability Methods

# R package 'abrem'
# Abernethy Reliability Methods
# Implementations of lifetime data analysis methods described in
# 'The New Weibull Handbook, Fifth edition' by Dr. Robert B. Abernethy.
# April 2014, Jurgen Symynck
# Copyright 2014, Jurgen Symynck
#
# For more info, visit http://www.openreliability.org/
#
# For the latest version of this file, check the Subversion repository at
# http://r-forge.r-project.org/projects/abernethy/
#
# Disclaimer:
#    The author is not affiliated with Dr. Abernethy or Wes Fulton - CEO of
#    Fulton Findings(TM) and author of the software package SuperSMITH
#-------------------------------------------------------------------------------
#    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 3 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, see <http://www.gnu.org/licenses/>.
#
# +-----------------------------------+
# |  execute this software with R:    |
# |  http://www.r-project.org/        |
# +-----------------------------------+

seq.wb <- function(from,to,base=seq(1,9,1)){
   # define gridline positions for 'Median Rank' axis (= y axis)
   r <- c(seq.log(from,.9,base),rev(1-seq.log(1-to,0.1,base))[-1])
   r[r >= from & r<=to]}

seq.log <- function(from,to,base=c(1,2,5)){
   r <- NULL
   for(i in floor(log10(from)):floor(log10(to)))r <- c(r,base*10^i)
   r[r >= from & r<=to]}