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...r 8.4)* TK_LIBRARY=/usr/lib/tk8.5 *(or 8.4)* but the error hold over. 4.Therefore, after this modifications, i uninstalled R and I installed again it. I try to do this both without setting environment variables and setting it. The error hold over. I look for a solution. Thank you Davide Massidda *-- QPLab - Quantitative Psychology laboratory Department of General Psychology Via Venezia 8 -35131 Padova, Italia* [[alternative HTML version deleted]]

...ommand works fine. Similarly, the tcl command: > tcl("after",1000,plot(rnorm(100))) <Tcl> works fine. But, if I send the command: > tcl("after",1000,10^2) <Tcl> after#0 appears a popup window which reports: Error: invalid command name ?100? Why? Davide Massidda Universit? di Padova Dipartimento di Psicologia Generale Via Venezia, 8 - 35131 Padova - Italy QPLab http://qplab.psy.unipd.it/ tel. +39 049 8276905