[pstricks] node name problem

[Herbert Voss]

Jean-Come Charpentier wrote:

> In fact, I think that my problem was this: My labels had the syntax 
> p(<num>,<num>), in the exemple before, the line
>          \rput(0,0.5){\Rnode{\n,\N}{\@nameuse{l\N}}}%
> was
>          \rput(0,0.5){\Rnode{p(\n,\N)}{\@nameuse{l\N}}}%
> and the line
>    \ncarc[arcangle=-60]{->}{1,1}{\the\lastletter,\the\lastletter}
> was
>    \ncarc[arcangle=-60]{->}{p(1,1)}{p(\the\lastletter,\the\lastletter)}
> 
> With the syntax "p(<num>,<num>)" TeX was not happy ... very angry in 
> fact :-).  Why?  I believed that labels name was *very* free. An other 
> behavior is funny: if the label is "p<num>/<num>", TeX is happy, dvips 
> is happy but gv is not happy.  Why? Character  "/" is understound as an 
> operator by gv? Why parenthesis and comma are prohibit? Is there other 
> characters prohibit?

all nodes are saved in the PostScript dictionary with the
prefix N at . In your first case you have N at 1,1 which is a valid
name. Only the special characters () [] {} / %  are _not_
allowed, they have a special meaning for PostScript:
String - Array - group - start name/prozedure - command

Herbert




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