Displaying minor logarithmic ticks in x-axis in R

Question

I have a normal distribution plot and a histogram plot with x axis in log scale displaying 0, 10^0, 10^1 ... I want to include minor ticks between the major ones. Actually I was

Answer 1

There was a small error,

lims<-lims[3:4] was missing

   minor.ticks.axis <- function(ax,n,t.ratio=0.5,mn,mx,...){

  lims <- par("usr")
  if(ax %in%c(1,3)) lims <- lims[1:2] else lims <- lims[3:4]

  major.ticks <- pretty(lims,n=5)
  if(missing(mn)) mn <- min(major.ticks)
  if(missing(mx)) mx <- max(major.ticks)

  major.ticks <- major.ticks[major.ticks >= mn & major.ticks <= mx]

  labels <- sapply(major.ticks,function(i)
            as.expression(bquote(10^ .(i)))
          )
  axis(ax,at=major.ticks,labels=labels,...)

  n <- n+2
  minors <- log10(pretty(10^major.ticks[1:2],n))-major.ticks[1]
  minors <- minors[-c(1,n)]

  minor.ticks = c(outer(minors,major.ticks,`+`))
  minor.ticks <- minor.ticks[minor.ticks > mn & minor.ticks < mx]


  axis(ax,at=minor.ticks,tcl=par("tcl")*t.ratio,labels=FALSE)
}

Answer 2

There is the minorAxis function in the StratigrapheR package, that can be used for any kind of minor ticks. It can be used with the seq_log function to make logarithmic ticks:

library(StratigrapheR)

x <- exp(rnorm(200, 5))
hist(log10(x), 20, xaxt="n", xlim=c(0, 4), xlab = "x", main = "Logarithmic Histogram of x")

ticks <- seq_log(10^0,10^4, divide = T)

lab <- sapply(0:4, function(i) as.expression(bquote(10^ .(i))))

minorAxis(1, at.maj = log10(ticks[[1]]), at.min = log10(ticks[[2]]), labels = lab)

Gives: