(sw-mex)=

# sw_mex

## Syntax
  
`sw_mex(Name,Value)`
  
## Description
  
`sw_mex(Name,Value)` compiles and tests the generated mex files. The
compiled mex files will speed up the [spinw.spinwave](#spinw-spinwave) function. The
expected speedup is larger for smaller magnetic unit cells. Once the mex
files are compiled, use the `swpref.setpref('usemex',true)` command to
switch on using mex files in [spinw.spinwave](#spinw-spinwave).
  
## Name-Value Pair Arguments
 
`'compile'`
: If `false`, mex files will not be compiled. Default is
  `true`.
  
`'test'`
: If `true`, the compiled .mex files will be tested. Default is
  `false`.
  
`'swtest'`
: If `true`, 3 spin wave calculation will run with and without .mex
  files and the results will be compared. Default is `false`.
  
## See Also
  
[swpref](#swpref)