.. DO NOT EDIT.
.. THIS FILE WAS AUTOMATICALLY GENERATED BY SPHINX-GALLERY.
.. TO MAKE CHANGES, EDIT THE SOURCE PYTHON FILE:
.. "auto_examples/plot_merged_large_spectrum.py"
.. LINE NUMBERS ARE GIVEN BELOW.

.. only:: html

    .. note::
        :class: sphx-glr-download-link-note

        Run this example online :

        - Click :ref:`here <sphx_glr_download_auto_examples_plot_merged_large_spectrum.py>`
          to download the full example code

        - Then start `Radis-Lab <https://radis.github.io/radis-lab/>`__,
          upload the Jupyter notebook, and run it from there.

.. rst-class:: sphx-glr-example-title

.. _sphx_glr_auto_examples_plot_merged_large_spectrum.py:


.. _example_large_range_by_part:

==================================
Calculate a large spectrum by part
==================================

In may be faster to calculate a full-range spectrum on several partial spectral ranges,
and combine them.

Uses the :py:func:`~radis.los.slabs.MergeSlabs` function for that.

Starting from 0.11, RADIS introduces a sparse waverange implementation
that should make it possible to directly compute a full range spectrum.
See the :ref:`HITRAN full-range example <example_hitran_full_range>`

.. GENERATED FROM PYTHON SOURCE LINES 19-47



.. image-sg:: /auto_examples/images/sphx_glr_plot_merged_large_spectrum_001.png
   :alt: plot merged large spectrum
   :srcset: /auto_examples/images/sphx_glr_plot_merged_large_spectrum_001.png
   :class: sphx-glr-single-img


.. rst-class:: sphx-glr-script-out

 .. code-block:: none

    OH-hitemp-radisdb-1000K-#5120 new quantities added: ['emisscoeff']
    OH-hitemp-radisdb-1000K-#5376 new quantities added: ['emisscoeff']
    OH-hitemp-radisdb-1000K-#5632 new quantities added: ['emisscoeff']
    Spectrum Name:  OH-hitemp-radisdb-1000K-#5120//OH-hitemp-radisdb-1000K-#5376//OH-hitemp-radisdb-1000K-#5632
    Spectral Quantities
    ----------------------------------------
       abscoeff     [cm-1]  (99,502 points)
       emisscoeff   [mW/cm3/sr/cm-1]        (99,502 points)
       radiance_noslit      [mW/cm2/sr/cm-1]        (99,502 points)
       emissivity_noslit    (99,502 points)
       absorbance   (99,502 points)
       transmittance_noslit         (99,502 points)
    Physical Conditions
    ----------------------------------------
       Tgas                 1000 K
       Trot                 1000 K
       Tvib                 1000 K
       isotope              N/A
       mole_fraction        0.1
       molecule             {'OH'}
       overpopulation       None
       path_length          1 cm
       pressure_mbar        10000.0 mbar
       rot_distribution     boltzmann
       self_absorption      True
       state                X
       thermal_equilibrium  True
       vib_distribution     boltzmann
       wavenum_max          N/A cm-1
       wavenum_min          N/A cm-1
    Computation Parameters
    ----------------------------------------
       NwG                  N/A
       NwL                  4
       Tref                 296 K
       add_at_used          cython
       broadening_method    voigt
       cutoff               1e-27 cm-1/(#.cm-2)
       dbformat             hitemp-radisdb
       dbpath               /home/docs/.radisdb/hitemp/OH-13_HITEMP2020.hdf5
       default_output_unit  cm-1
       folding_thresh       1e-06
       include_neighbouring_lines  True
       memory_mapping_engine  auto
       neighbour_lines      0 cm-1
       optimization         simple
       parfuncfmt           hapi
       parsum_mode          full summation
       profiler             N/A
       pseudo_continuum_threshold  0
       radis_version        0.13.1
       sparse_ldm           True
       spectral_points      N/A
       truncation           50 cm-1
       waveunit             cm-1
       wstep                0.1 cm-1
       zero_padding         N/A
    Config parameters
    ----------------------------------------
       DEFAULT_DOWNLOAD_PATH  ~/.radisdb
       GRIDPOINTS_PER_LINEWIDTH_ERROR_THRESHOLD  1
       GRIDPOINTS_PER_LINEWIDTH_WARN_THRESHOLD  3
       SPARSE_WAVERANGE     auto
    Information
    ----------------------------------------
       calculation_time     0.22960855498968158 s
       chunksize            None
       db_use_cached        True
       dxG                  0.13753507880165727
       dxL                  0.20180288881201608
       export_lines         False
       export_populations   None
       export_rovib_fraction  True
       levelsfmt            None
       lines_calculated     5,672
       lines_cutoff         21,775
       lines_in_continuum   0
       load_energies        False
       lvl_use_cached       True
       parfuncpath          None
       total_lines          27447
       warning_broadening_threshold  0.01
       warning_linestrength_cutoff  0.01
       wavenum_max_calc     N/A cm-1
       wavenum_min_calc     N/A cm-1
    ----------------------------------------


    (0.0, 1.0)





|

.. code-block:: default


    from radis import MergeSlabs, calc_spectrum

    spectra = []
    for (wmin, wmax) in [(50, 3000), (3000, 7000), (7000, 10000)]:

        spectra.append(
            calc_spectrum(
                wmin,
                wmax,
                Tgas=1000,
                pressure=10,  # bar
                molecule="OH",
                path_length=1,
                mole_fraction=0.1,
                wstep=0.1,
                databank="hitemp",
                verbose=False,
            )
        )

    s = MergeSlabs(*spectra, resample="full", out="transparent")
    print(s)
    s.plot("transmittance_noslit", wunit="nm")

    import matplotlib.pyplot as plt

    plt.ylim(0, 1)


.. rst-class:: sphx-glr-timing

   **Total running time of the script:** ( 0 minutes  1.325 seconds)


.. _sphx_glr_download_auto_examples_plot_merged_large_spectrum.py:

.. only:: html

  .. container:: sphx-glr-footer sphx-glr-footer-example


    .. container:: sphx-glr-download sphx-glr-download-python

      :download:`Download Python source code: plot_merged_large_spectrum.py <plot_merged_large_spectrum.py>`

    .. container:: sphx-glr-download sphx-glr-download-jupyter

      :download:`Download Jupyter notebook: plot_merged_large_spectrum.ipynb <plot_merged_large_spectrum.ipynb>`