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[Giovanni Piredda <address@hidden>]

On 25.11.20 13:41, Massimiliano Gubinelli wrote:
> Too many brackets.
>
> Remove the external pair of parentheses.

Max has been faster than me in answering :-)

In the last expression in your screenshot you have two parenthesis at 
the start and four at the end, while it should be

(stree->tree '(rectangle (point 0 0) (point 1 1)))

(one parenthesis at the start, three at the end)

In addition:

> i typed "tree" in the help and it gave me pages where i did not have 
> the sensation to find
"tree" is too general a term in TeXmacs to allow the search tools to 
find the help to the question, as all of the TeXmacs document parts are 
trees.

Let me also point you to the blog post I wrote on graphics in TeXmacs ;-)

https://texmacs.github.io/notes/docs/scheme-graphics.html

Another one is in preparation :-)

Scheme is a rather different language from imperative languages like 
Fortran and it takes a bit to get used to, in that one needs to write 
programs as compositions of functions rather than as a sequence of 
instructions. But I do not yet feel that I have enough command on the 
language to discuss with confidence its advantages/disadvantages with 
respect to other languages (although sometimes the possibility to 
compose expressions arbitrarily feels nice).