Hi Thomas, You may want to check out the quantmod package. There is a whole suite of charting functionality now included. You will need to change the 'Last' colname to Close, but other than that your data should work. If you download the most recent build or svn snapshot from http://r-forge.r-project.org/projects/quantmod you'll find many additional functional that may be of use. Additionally, there are some (possibly dated) examples on the main site page at http://www.quantmod.com The most recent version allows for custom tick mark location by dates, as well as zooming capabilities. Additionally TA analysis can be applied to the charts (the underlying functionality coming from the TTR package on CRAN and r-forge) Jeff