[Gnuplot-info] how to carry sum (or similar math operation) with gnuplot

[Jon <dev...@gm...>]

Dear All,

I am trying to carry out sum functionality on a dataset, and wonder how I
can possible do that.

Suppose I have dataset aaa.txt
1   4
2   5
3   4
4   9
5   10

and I would like to get sum of the second column. I guess the basic idea is
to use set term dumb, and thought of something like this

set term dumb
s=0
plot 'aaa.txt' u (s=s+$2,$1):2 w l

but it complains that ')' expected. I kind of know why as everything in the
plot statement is treated as character expression, and might not recognize
"+" operation. Please correct me if wrong.

So what else can I do to get me out of this problem?

Many thanks!!

Sincerely,
Jon