i have the axis line of code  below in a plotting command and it works
nicely  but it puts tick values at every 5 of lt and i would like a tick
value at every value of lt. i read about pretty() but that sounded
tricky so instead , since i want a tick mark at every value of lt ( it's
discrete and goes from o to some max value usually arounsd 35 or 40 )
 
i changed the line to  at = seq(1,max(lt) ) but that gave me no
tickmarks ?
 
any help is appreciated. thanks.
 
#-----------------------------------------------------------------------
--------
 
axis(4, at = pretty(range(lt)),line=0.75,tick=TRUE)
 
#-----------------------------------------------------------------------
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