PPT Slide

• Full matrix refinement is available

  • SHELLX, and RESTRAIN.
  • Full matrix programs usually allow for the exclusion of subsets of off-diagonal elements.
    • REFMAC offers such methods

• Ignoring all off-diagonal elements leads to the diagonal approximation and preconditioned conjugate gradient.

  • TNT, and BUSTER

• Ignoring the diagonal elements leads to steepest descent and conjugate gradient.

  • X-PLOR, and CNS

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