errorbar in bar graph

KurtB wrote:

I suspect you have created the plot as an x-y plot (or y - calculated plot), mode=5 (bars), and perhaps with an x-offset=-0.5 to get the axis labels centred?
You can plot the data again (as a dot) and add the error bars to this data to achieve the desired (?) result.
But, I think it is easier by plotting a category plot.

Here is an example of both methods:

Function Test()
    // make some data
    make/O/T wCat={"7","8","9","10","11"}
    make/O wData={10,9,10,11,8}
    make/O wError={2,3,3,1,2}
    
    // category plot
    Display wData vs wCat
    ErrorBars wData Y,wave=(wError,wError)
    
    // bar plot
    Display /W=(312,369.5,706.5,578) wData,wData
    ModifyGraph mode(wData)=5,mode(wData#1)=2
    ModifyGraph hbFill(wData)=4
    ModifyGraph offset(wData)={-0.5,0}
    ErrorBars wData#1 Y,wave=(wError,wError)
End

You can get make a category plot from the user interface using the menu item Windows > New > Category Plot...

Hope this helps,
Kurt