text_combined: mark difford mark_diffordyahoocouk hi megan would like xaxis labels years line every two bars plot one bar hardwood another softwood isnt clear description really want found attachment seem trying get tickmarklabel centremidpoint yearly grouping look examples author barplot provided _in particular_ read author method says value use colmeans object returned barplot position labels regards mark megan j bellamy wrote hello created barplot shows change hardwoodsoftwood density 1965 2005 5 year periods 19651970 etc would like xaxis labels years line every two bars plot one bar hardwood another softwood script densityreadtablefmeganvtestcsv headertrue sep attach density barplotdensityyear colcblue green green blue blue green blue green green blue green blue blue green green blue blue green legend185csoftwood hardwood fillcblue green btyn titleylabdensity softwood hardwood percent titlexlabyear measurement titlemainchange softwood hardwood density 19652005 psp 80 axis2 atnull tried using tck axislty functions luck also tried axis1 atyear first year 1965 comes attached csv file help would greatly appreciated many thanks advance megan ______________________________________________ rhelprprojectorg mailing list httpsstatethzchmailmanlistinforhelp please read posting guide httpwwwrprojectorgpostingguidehtml provide commented minimal selfcontained reproducible code view message context httpwwwnabblecomtickmarksthatcorrespondwithbarsonbarplottp18890762p18892131html sent r help mailing list archive nabblecom ______________________________________________ rhelprprojectorg mailing list httpsstatethzchmailmanlistinforhelp please read posting guide httpwwwrprojectorgpostingguidehtml provide commented minimal selfcontained reproducible code fri 08 aug 2008 064503 0700 r tick marks correspond bars barplot