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...quot;,"Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec") gantt.chart(gantt.info,main="My First AIRC Grant Gantt Chart", priority.legend=TRUE,vgridpos=vgridpos,vgridlab=vgridlab,hgrid=TRUE) Error in if (any(x$starts > x$ends)) stop("Can't have a start date after an end date") : missing value where TRUE/FALSE needed Thanks Gabriele Zoppoli, MD Ph.D. Fellow, Experimental and Clinical Oncology and Hematology, University of Genova, Genova, Italy Guest Resea...

I am having a problem with a gantt chart since moving to R2.4.0. from 2.3.1 I made some adaptations to the code from http://addictedtor.free.fr/graphiques/RGraphGallery.php?graph=74 and successful produced a simple gantt chart. However when I upgraded to 2.4.0 it no longer works as desired. See http://ca.geocities.com/jrkrideau/R/gantproblem.pdf for the two charts. The charts were produced