files for plotting given by string function

[Petr M. <mi...@ph...>]

I tried to generate filename via a string function, and plot them (sometimes
filenames are very long). For example:

f(n)='a'.n.'.dat'
plot f(1), f(2)

=> it should be equivalent to plot 'a1.dat', 'a2.dat'. However, gnuplot
complains:

	warning: encountered a string when expecting a number
	NB: you cannot plot a string-valued function

I wish it behaves like I expect, i.e. string means filename.

Ethan, could you change this behaviour?

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PM