[R] Conditional ploting with logical vector

Jim Lemon jim at bitwrit.com.au
Sat Apr 5 14:03:27 CEST 2008

Armin Goralczyk wrote:
> Hi list
> Maybe someone can help with the following problem (thanks in advance):
> In a function I have a plot and want to add symbols/text only when
> indicated by a logical vector (which was generated by the function
> before, not manually like in the following example):
> plot(1:10, 1:10)
> lv <- c(T,T,T,F,F,F,T,T,T,F)
> text(1:10, 1:10, '*', pos = 3)
> In this example the asterisk is plotted at every yx-coordinate
> indicated. How Can I make it appear only when 'TRUE' in the lv?
text(1:10, 1:10,cond.astrx, pos = 3)

> Another (statistical) question:
> Actually this function generates significance levels to the plot at 10
> time points of a time series by comparing the values at the single
> time points by a t-test. I know this is probably not the correct way
> to compare the whole series, but I have to do it this way
> ('constraints'). The question is: do I have to adjust for multiple
> testing by e.g. Bonferroni correction?
I vote yes.


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