Fortran code for spins in heisenberg hamiltonian

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quin
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hi friends. i don't know how can i write a fortran code for expressing spins in Heisenberg model which have 3 dimension spin operator, sx,sy,sz?
thanks for your help
 
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quin said:
hi friends. i don't know how can i write a fortran code for expressing spins in Heisenberg model which have 3 dimension spin operator, sx,sy,sz?
thanks for your help
What have you tried? We are not going to write the code for you, if that's what you had in mind.