[Pw_forum] fix volume

[Sakhrawi Taoufek]

Dear all,

i want to fix the volume and each time calculate the total energy to optimize the lattice parameter, there is any idea how to proceed.
each suggestion will be appreciated.
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Sakhraoui
Taoufik
Ph.D student 
Faculty of Sciences of Monastir
Department of Physics
L.M.C.N
Monastir, Tunisia
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