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["Takama M." <address@hidden>]

Henri Lesourd  wrote:
> Much better to use:
> (tree-label $TREE) -> Symbol
> (tree-arity $TREE) -> Integer
> (tree-ref $TREE $INDEX) -> Tree
>
> to read/traverse the tree.
Thanks for your kind response.
It's helpful for me.
I asked the previous question because
i consider some coordinate transformation
procedure for my graphics drawing which
refer to the value of variables such as
"gr-geometry" and "gr-grid".

Best regards
M. Takama