This is a very newbie question on R syntax, but I do not find the answer....
I want to make a selection on an interval say choose Xint in the interval of temperatures 390-399
I tried this syntax
Xint<- X[t>=390 && t< 400] typing >XintI get the answer numeric(0)
it did not select any object! 'though I verified that there indeed are occrencies of X in this interval
Any idea?
thanks
Anne
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