how to work with arbitrary precision and accuracy?

[arnau . mir]

Hello.
I don't know if octave can do this. My question is about to work with an 
arbitrary precission and accuracy with octave.
For example, if I do:
output_precision = 32
and next I do
pi
octave responses:
3.1415926535897931159979634685442e+00
but this number only has 16 numbers correctly.
What have to do if I work with 32 numbers?

Thanks in advance,

Arnau.




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