how to represent a variable in a bar graph

[Anonymous]

hello everyone, I explain my issue.

I have a table where people are grouped into groups, each person has associated data for various calculations and the final column I have the final data of each.  As in the picture below

Now I would like to to represent the sum of the values in the variable in a bar chart, but if I write the expression sum ($ (variable)) nothing happens. Is there a way to do it?

[marcus_sommer]

You couldn't (really) store column calculation-values into a variable and use them into another object - it looks like a very complicated approach for a probably simple bar-chart with one or two dimensions and one expression - try it at first so simple.

- Marcus