gnuplot development

use the 'sprintf()' function or put an empty string in front:
"".i."/namefile"


warpino wrote:
> 
> Hi all,
> 
> I want to plot some files with the same name located in some progressively
> number folders (i.e.: 1, 2, 3, 4 ...) all at the same path level. So,
> starting from the parent directory I do a
> 
> plot for[i=1:4]  i."/namefile" u 1:3 w linespoints
> 
> but then I get:
> 
>         internal error : STRING operator applied to non-STRING type
> 
> Is there a way to solve this? It is a bit strange, cause if I have some
> progressively numbered files, instead:  namefile1, namfile2, namfile3, and
> so forth, I can do - from the directory where files are:
> 
> plot for[i=1:3] "namefile".i u 1:3 w linesp
> 
> and get the result I want. Do you have any idea?
> 
> Thanks,
> 
> N.
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Nunzio Losacco wrote:
> plot for[i=1:4]  i."/namefile" u 1:3 w linespoints
> 
> but then I get:
> 
>         internal error : STRING operator applied to non-STRING type

[...]

> plot for[i=1:3] "namefile".i u 1:3 w linesp

The difference that makes this work is that this time you _started_ with 
a string, so gnuplot knows that 'i' has to be converted to one.  But 
this mechanism doesn't work for an operand that begins an expression.

IIRC,

	"".i.""/namefile"

should work.