> how do I add the "prime" (first derivative) to a R-plot? sorry for the noise, I found it myself: http://finzi.psych.upenn.edu/R/Rhelp02a/archive/20984.html I use now (works fine) plot(1,1,xlab=expression(frac("F'"(0),"R'"(0))),xaxt="n") Thomas
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