For certain applications such as Pareto graphs it is preferable to plot numerical data on the ordinate againts a categorical value (i.e. a string) on the abscissa. Can you do this with LabView ?
You can't wire a string to a graph, but in order to have a graph, as long as i cn see, you must have two numerical values (X & Y), once you have your graph made, you can make the axis values invisible and put a string where you want. Hope this helps
One thing you can do is assign cursors to the bar graph and write your categories as cursor labels. If you have the SPC toolkit, there's an example that shows how to do this.