(spinw-quickham)=

# spinw.quickham method

## Syntax
  
`quickham(obj,J)`
  
## Description
  
`quickham(obj,J)` generates the bonds from the predefined crystal
structure and assigns exchange values to bonds such as `J(1)` to first
neighbor, `J(2)` for second neighbor etc. The command will erase all
previous bonds, anisotropy, g-tensor and matrix definitions. Even if
`J(idx) == 0`, the corresponding bond and matrix will be created.
   
  
## Input Arguments
  
`obj`
: [spinw](#spinw) object.
  
`J`
: Vector that contains the Heisenberg exchange values. `J(1)` for
     first neighbor bonds, etc.
 
## See Also
 
[spinw.gencoupling](#spinw-gencoupling) \| [spinw.addcoupling](#spinw-addcoupling) \| [spinw.matrix](#spinw-matrix) \|
[spinw.addmatrix](#spinw-addmatrix)