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# Interface Composite

**Difference between revisions from 2010/09/01 13:34 and 2010/09/01 13:30.**

This interface performs multiple calculations on the system using different methods. The results are then combined according to an user-defined formula. It is possible to work with both total; energy and its components. !Keywords * composite_method_names List of method names used to identify them in the input and in the equation. * composite_equation !Input Each calculation should be specified in the input in a subsection calculation_''method_name''. The equation uses ruby syntax. Results of the calculations are accessible in variables named with the method name. These variables are hashes containing all the energy components (index is symbol corresponding to the component name). The total energy can be accessed as ''method_name''^[:energy^] !Example Here is sample input for MP2/CBS extrapolation (Halkier et al. 1998) with CCSD(T) correction in smaller basis set. {html} <pre><code>interface: composite charge: 0 composite_method_names: - mp2t - mp2q - cc composite_equation: " mp2q[:scf_energy] + (3**3 * mp2t[:mp2_corr_energy] - 4**3 * mp2q[:mp2_corr_energy])/(3**3 - 4**3) + (cc[:ccsdt_corr_energy] - cc[:mp2_corr_energy])" calculation_mp2t: interface: molpro method: mp2 density_fitting: yes basisset: aug-cc-pVTZ calculation_mp2q: interface: molpro method: mp2 density_fitting: yes basisset: aug-cc-pVQZ calculation_cc: interface: molpro method: ccsdt basisset: aug-cc-pVDZ</code></pre> {/html}