[SPAM] geting the size of a string rendered in a plot

[Adrien Vogt-Schilb]

Hi

I am writing legends in a plot with the command xstring
xstring(x,y,"my label")

"my label" is actually a Latex formula

I would like to know the size of "my label" rendered, so i can adjust 
it's position in such way that it is centered vertically

Does anyone know hoy i could do that?
-- 
Adrien Vogt-Schilb (Cired)
Tel: (+33) 1 43 94 *73 77*
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