How do I convert an integer to a string in gnuplot?

Question

I know how to use $ with using in examples like

plot datafile using f($1):g($2)

to plot functions of column data. But

Answer 1

How about something like this? The loop statement could be different depending on the shell you are using. The one below is using bash.

plot '< for i in 1 2 3 4 ; do echo $i ; done' us ($1):($1+1)