Thanks Mr.Pr. Ripley,
 
For pointing me in the good direction,
i use win.graph() so i get an overview of the different graphs.
Until now, i v had no problems with it, hope it stays that way.


for those whom have the same porblem, this is what i do:

 win.graph();   op <- par(mfrow = c(1,2)  , oma= c(1,1,1,1))
 boxplot(lg_value~labo, main="Test 1 at day 1",ylab="log(x) ",
 xlab="different lab's", data=dataset,ylim=c(-0.05,5))
 mtext("At day 1",line=-1,outer=TRUE)
 boxplot(lg_value~labo, main="Test 2 at day 1",ylab="log(x)",
 xlab="different lab's", data=dataset,ylim=c(-0.05,5))
 par(op);

Kind regards,
Tom W.


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