creates energy for spectrum color plot spectra = SW_EGRID(spectra, 'Option1', Value1, ...) It creates a grid along energy and stores the requested correlation function component(s) binned in energy using the grid. Input: spectra Input structure, contains calculated correlation functions. Options: component Selects which correlation function component to be binned in energy. The possible options are: 'Sperp' bins the magnetic neutron scattering intensity (<Sperp * Sperp> expectation value). Default. 'Sab' bins the selected components of the spin-spin correlation function. Letter a and b can be 'x', 'y' or 'z'. For example: 'Sxx' will convolute the xx component of the correlation function with the dispersion. xyz is the standard coordinate system, see online documentation of sw. 'Mab' bins the selected components of the spin-spin correlation function. Letter a and b can be 'x', 'y' or 'z'. For example: 'Mxx' will convolute the xx component of the correlation function with the dispersion. The coordinates here are in the Blume-Maleev coordinate system, see below. 'Pab' bins the selected element of the polarisation matrix. Letter a and b can be 'x', 'y' or 'z'. For example: 'Pyy' will convolute the yy component of the polarisation matrix with the dispersion. The coordinates used are in the Blume-Maleev coordinate system, see below. 'Pa' bins the intensity of the simulated polarised neutron scattering, with inciden polarisation of Pa. Letter a can be 'x', 'y' or 'z'. For example: 'Py' will convolute the scattering intensity simulated for incident polarisation Pi || y. The used coordinates are in the Blume-Maleev coordinate system, see below. 'fName' where fName is one of the field names of the input structure spectra. This field should contain a matrix with size [nMode nHkl]. Any linear combination of the above are allowed, for example: 'Sxx+2*Syy' bins the linear combination of the xx component of the spin-spin correlation function with the yy component. Several cross section can be convoluted and stored independently, if component is a cell array containing strings each containing any linear combination of cross sections as above, the cell array needs to have size [1 nCell]. Evect Vector, defined the center of the energy bins of the calculated output, dimensions ar is [1 nE]. The energy units are defined by the unit.kB property of the sw object. Default is linspace(0,1.1*maxOmega,500). T Temperature to calculate the Bose factor in units depending on the Boltzmann constant (sw.unit.kB). Default temperature is taken from obj.single_ion.T. The Bose factor is includec in swConv field of the output. sumtwin If true, the spectra of the different twins will be summed together weighted with the normalized volume fractions. Default is true. modeIdx Select certain spin wave modes from the 2*nMagAtom number of modes to include in the output. Default is 1:2*nMagAtom to include all modes. The Blume-Maleev coordinate system is a cartesian coordinate system with (xBM, yBM and zBM) basis vectors as follows: xBM parallel to the momentum transfer Q, yBM perpendicular to xBM in the scattering plane, zBM perpendicular to the scattering plane. Output: spectra contains the following additional fields beside the input: swConv Stores the selected cross section binned along energy, size is [nE nHkl]. Includes the Bose factor. swInt Stores the selected cross sections for every mode, size is [nMode nHkl]. T Input temperature. component Cell that contains the input component selector strings. Evect Input energy bin vector. param All the other input parameters. If 'component' parameter is a cell array or the spectra of multiple twins are convoluted separately, swConv and swInt will be packaged into a cell. The dimensions of the cell are [nConv nTwin]. Example: spectra = sw_egrid(spectra,'component',{'Sxx+Syy' 'Szz'},'Evect',linspace(0,5,51)); The line will create an energy bin, with steps of 0.1 and bins the spin-spin correlation function. Two different matrices will be calculated, first using the sum of the Sxx and Syy components, second will contain the Szz component of the correlation function. See also SW.SPINWAVE, SW_NEUTRON.

- sw_egrid creates energy for spectrum color plot
- sw_neutron calculates neutron scattering intensity for spin wave spectrum
- sw_parstr parses input string
- sw_readparam parse input arguments (option, value pairs)

- sw_egrid creates energy for spectrum color plot

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