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["El.Douwen" <address@hidden>]

- for spreadsheet, i followed your advice and selected "insert>session giac" then it seems to work, but if i type spreadsheet("name_of_file") i dont know what sort of fil i must give, i suppose that no excel nor Ooo fil can match, so what ? how to create a simple sreadsheet with 6x4 cells for example... Where to find a help on this topic ?

in the same way, how can i find a manual fin order to know how the function geo2d works ?

Just type any filename you wish to save your spreadsheet.
If it does not exist it will be created, if it exists it will be loaded.
I usually use .tab as extension, e.g. "tableur.tab".
Do not use an existing OO or Excel file, it won't work. But you can copy/paste
from OO, and also import CSV file once the spreadsheet is opened
in a new windows.
The same applies for geo2d and 3d (no import/export here).
The documentation of Xcas applies for what you can do in
the spreadsheet or interactive geometry.

here are my trys....

  spreadsheet(toto.tab)

  \ Plot cancelled or unable to plot

  spreadsheet("toto.tab")

  \ Plot cancelled or unable to plot

  spreadsheet("toto.tab");

  \ Plot cancelled or unable to plot

  geo2d("toto");

  \ Plot cancelled or unable to plot