# ARTS built-in documentation server

## Workspace Method abs_lookupSetupBatch

### Description

Set up input parameters for abs_lookupCalc for batch calculations. This method performs a similar task as abs_lookupSetup, with the difference that the lookup table setup is not for a single atmospheric state, but for a whole batch of them, stored in batch_atm_fields_compact. The method checks abs_species to decide which species require nonlinear treatment in the lookup table. The method also checks which range of pressures, temperatures, and VMRs occurs, and sets abs_p, abs_t, abs_t_pert, and abs_vmrs accordingly. If nonlinear species are present, abs_nls and abs_nls_pert are also generated. Max and min values of H2O and temperature are adjusted to allow for numerical perturbations in Jacobian calculation. The input variables abs_nls_interp_order and abs_t_interp_order are used to make sure that there are enough points in abs_nls_pert and abs_t_pert for the chosen interpolation order. The method checks each given field using atmfields_checkedCalc. If a field does not pass the check, a run-time error is thrown. To prevent this, the parameter *robust* can be set to one: Invalid atmospheres are skipped, but the run continues. This matches the robust behaviour of ybatchCalc. See also: abs_lookupSetup

**Authors: **Stefan Buehler

### Synopsis

abs_lookupSetupBatch( | abs_p, abs_t, abs_t_pert, abs_vmrs, abs_nls, abs_nls_pert, abs_species, batch_atm_fields_compact, abs_p_interp_order, abs_t_interp_order, abs_nls_interp_order, atmosphere_dim, p_step, t_step, h2o_step, extremes, robust, check_gridnames ) |

### Variables

OUT | abs_p | (Vector) | List of pressures to be used for the calculation of absorption coefficients. |

OUT | abs_t | (Vector) | List of temperatures to be used for the calculation of absorption coefficients. |

OUT | abs_t_pert | (Vector) | Temperature perturbations for the absorption lookup table. |

OUT | abs_vmrs | (Matrix) | The VMRs (unit: absolute number) on the abs_p grid. |

OUT | abs_nls | (ArrayOfArrayOfSpeciesTag) | Nonlinear species for absorption lookup table generation. |

OUT | abs_nls_pert | (Vector) | Fractional perturbations for the nonlinear species in the absorption lookup table. |

IN | abs_species | (ArrayOfArrayOfSpeciesTag) | Tag groups for gas absorption. |

IN | batch_atm_fields_compact | (ArrayOfGriddedField4) | An array of compact atmospheric states. |

IN | abs_p_interp_order | (Index) | The interpolation order to use when interpolating absorption between pressure levels. |

IN | abs_t_interp_order | (Index) | The interpolation order to use when interpolating absorption between the temperature values given by abs_t_pert. |

IN | abs_nls_interp_order | (Index) | The interpolation order to use when interpolating absorption between the H2O values given by abs_nls_pert. |

IN | atmosphere_dim | (Index) | The atmospheric dimensionality (1-3). |

GIN | p_step | (Numeric, Default: 0.05) | Grid step in log10(p[Pa]) (base 10 logarithm). |

GIN | t_step | (Numeric, Default: 20) | The temperature variation grid step in Kelvin. The true step can become finer than this, if required by the interpolation order. |

GIN | h2o_step | (Numeric, Default: 100) | The H2O variation grid step [fractional], if H2O variations are done (which is determined automatically, based on abs_species and the atmospheric dimension). As for T, the true step can turn out finer if required by the interpolation order. |

GIN | extremes | (Vector, Default: []) | You can give here explicit extreme values to add to abs_t_pert and abs_nls_pert. The order is [t_pert_min, t_pert_max, nls_pert_min, nls_pert_max]. |

GIN | robust | (Index, Default: 0) | A flag with value 1 or 0. If set to one, the batch setup will continue, even if individual fields are invalid. This is consistent with the behaviour of ybatchCalc. |

GIN | check_gridnames | (Index, Default: 0) | A flag with value 1 or 0. If set to one, the gridnames of every atm_fields_compact are checked. |