[Pw_forum] negtive values for TA when using q2r.x

[li yan]

dear all,
   i use q2r.x  to calculate the phonon dispersion curves for AgF. at 3GPa, there are many negtive values for TA in the brillion zone. then i just calculated one of these points, but i got a positive values. 
     then i used 6*6*6 q mesh, no improvement is found. 
     what can i do next?
   ragards
      

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