v0.7.0

What's new

Features

• Support for complex amplitude simulation.
• New isotropic interpolation schemes. Added isotropic_interpolation as a sim.config parameter. Allowed values are linear and Gaussian.
• A new larmor_freq(B0) function is added to the Isotope class, which returns the Larmor frequency of the isotope, given a magnetic flux density. For example, H1.larmor_freq(B0=9.40)
• New weak J and dipolar coupling enumerations are added to freq_contrib.
• New command-line interface (CLI) tools for mrsimulator.
• Added 200+ NMR active isotopes to the library.
• Support for python 3.10

Method

• New Event classes---SpectralEvent and MixingEvent. The MixingEvent controls the transition amplitude mixing in a multi-event method.
• New TotalMixing and NoMixing mixing query enumerations for quick scripting of common mixing events.
• New weights attribute for the TransitionPathway object, which holds the probability of the transition pathway based on the mixing events defined within the method.
• New plot() function in Method class, which generates a visual representation of the method's events, transition pathways, rotor angle, etc.
• Support for concurrent mixing events.
• Support for negative spectral width in a spectral dimension.
• Deprecated Method1D and Method2D classes. Use the generic mrsimulator.method.Method object for custom 1D and 2D methods.

SpinSystem

• New function simplify() to simplify a spin system object to a list of irreducible spin systems.
• New function site_generator() added to the utility collection sub-module, which simplifies the process of creating Site objects in bulk.
• Added gyromagnetic ratio and quadrupole moment metadata for all isotopes, including unstable isotopes.

SignalProcessor

• New SkewGaussian, TopHat, and Mask apodization functions were added to the signal processor module.

Documentation

• Restructured documentation layout
• Improved troubleshooting section.
• Added section User Guide detailing the use and attributes of most objects.
• Added section Method demonstrating how to create custom Method objects.
• Condensed simulation/fitting gallery by removing redundant examples.
• New gallery demonstrating signal processing functions.

Changes

• reduced_dict function is deprecated, use json(units=False) instead.
• The mrsimulator.signal_processing module is renamed to mrsimulator.signal_processor
• Drop support for Python version 3.6
• Added Channel validation for named methods #177
• Optimized memory usage and performance of the single_site_system_generator utility function.

Bug fixes

• Fixed bug where spectral interpolation resulted in a segmentation fault.
• Fixed memory leak issue in the C code.
• Fixed bug in query combination involving multiple quadrupolar queries. #188.
• Fixed bug related to unsigned/signed integers crashing on M1 macs.

Breaking changes

For most users
Mrsimulator is currently in development, and the new release includes breaking changes from v0.6.
Please review these changes and make changes according.

• The mrsimulator.methods module is renamed as mrsimulator.method.lib.
• The mrsimulator.signal_processing module is renamed to mrsimulator.signal_processor.
• The data attribute of SignalProcessor.apply_operations(data=...) is renamed to dataset. Use SignalProcessor.apply_operations(dataset=...)
• The transition_query attribute of the mrsimulator.method.SpectralEvent class is renamed to transition_queries.
• The mrsimulator.method.query.RotationalQuery class is renamed to mrsimulator.method.query.RotationQuery

For advanced users

• Complete redesign of the TransitionQuery object. Please refer to the documentation for details.

v0.6.1post1

Merge branch 'v0.6.x' of https://github.com/DeepanshS/MRsimulator int…

…o v0.6.x

v0.6.1

What's new

• A new function for exporting and importing the methods from the simulator object.

v0.6.0

What's new

• ⭐ Improved simulation performance. ⭐ See our benchmark.
• Simulation of one-dimensional spectra of coupled spin systems. The frequency contributions from the coupled sites include weak J-couplings and weak dipolar couplings.
• New Coupling class.
• Added a new Sites class that holds a list of Site objects. The Sites class method, to_pd(), exports the sites as a pandas data frame.
• A new method, sites(), is added to the Simulator object, which returns a list of unique Site objects within the Simulator object across multiple spin systems.
• Added three new arguments to the single_site_system_generator() method,
  'site_labels', 'site_names', and 'site_descriptions'.

Changes

• The SpinSystem.get_isotopes method from the SpinSystem object will now return Isotope objects by default. Use the symbol=True argument of the method to get a list of string isotopes.
• The to_freq_dict() function is deprecated.
• The D symmetry of the transition_query attribute from the Method2D method is now None by default.
• BlochDecayCTSpectrum is an alias for BlochDecayCentralTransitionSpectrum class.

Bug fixes

• Fixed a bug related to the get_spectral_dimensions() utility method in cases when CSDM dimension objects have negative increment.
• Fixed a bug resulting in the non-conserved spectral area after a Gaussian apodization.
• Fixed a bug in Gaussian apodization, which raised an error when the FWHM argument is a scalar.
• Fixed bug causing multi-dataset fit to fail.

v0.5.1

Bug fixes

• Fixed a bug that was causing incorrect spectral binning when the frequency
  contribution is pure isotropic.

Other changes

• More fitting examples.
• The to_dict_with_units() method is deprecated and is replaced with json()
• The json() function returns a python dictionary object with minimal required keywords,
  where the event keys are globally serialized at the root method object. In the case where
  the event key value is different from the global value, the respective key is serialized
  within the event object.
• The json() function will no longer serialize the transition_query objects for the
  named objects.

v0.5.0

What's new

• ⭐ Improved simulation performance. ⭐ See our benchmark.

The update introduces various two-dimensional methods for simulating NMR spectrum.

• Introduces a generic one-dimensional method, Method1D.

• Introduces a generic two-dimensional method, Method2D.

• Specialized two-dimensional methods for multi-quantum variable-angle spinning with build-in affine transformations.

  • ThreeQ_VAS,
  • FiveQ_VAS,
  • SevenQ_VAS.

• Specialized two-dimensional methods for satellite-transition variable-angle spinning with build-in affine transformations.

  • ST1_VAS,
  • ST2_VAS,

• Specialized two-dimensional isotropic/anisotropic sideband correlation method,
  SSB2D.

v0.4.0

What's new!

• ⭐ Improved simulation performance. ⭐
• Added Czjzek and extended Czjzek second-rank symmetric tensor parameter distribution models for creating spin systems for amorphous materials.
• Add a new utility function, single_site_system_generator, for generating a list of single-site spin systems from a 1D list/array of respective tensor parameters.

v0.3.0

Mrsimulator

mrsimulator is an open-source python package for computing fast and versatile solid-state NMR simulator of one-dimensional static, MAS, and VAS spectra of nuclei experiencing chemical shift (nuclear shielding) and quadrupolar coupling interactions. The library is optimized for computing both crystalline and amorphous materials and is compatible with modern python packages, such as scikit-learn, Keras, etc. The core of the mrsimulator library is written in C, wrapped, and made available in python.

What's new!

• ⭐ Improved simulation performance. ⭐.
• Removed the Dimension class and added a new Method class instead.
• New methods for simulating the NMR spectrum:
  • BlochDecaySpectrum and
  • BlochDecayCentralTransitionSpectrum.

The Bloch decay spectrum method simulates all p=Δm=-1 transition pathways, while the Bloch decay central transition selective spectrum method simulates all transition pathways with p=Δm=-1 and d=0.

• New Isotope, Transition, and ZeemanState classes.
• Every class now includes a reduced_dict() method. The reduced_dict method returns a dictionary with minimal key-value pairs required to simulate the spectrum. Note, this may cause metadata loss, if any.
• Added a label and description attributes to the Site class.
• Added a new label attribute to the SpinSystem class.
• New SignalProcessor class for post-simulation signal processing.
• Improved usage of least-squares minimization using python LMFIT package.
• Added a new get_spectral_dimensions utility function to extract the spectral dimensions information from the CSDM object.

Bug fixes

• Fixed bug resulting from the rotation of the fourth rank tensor with non-zero euler angles.
• Fixed bug causing a change in the spectral area as the sampling points change. Now the area is constant.
• Fixed bug resulting in an incorrect spectrum when non-coincidental quad and shielding tensors are given.
• Fixed bug causing incorrect generation of transition pathways when multiple events are present.

Other changes

• Renamed the decompose attribute from the ConfigSimulator class to decompose_spectrum. The attribute is an enumeration with the following literals:
  • none: Computes a spectrum which is an integration of the spectra from all spin systems.
  • spin_system: Computes a series of spectra each corresponding to a single spin system.
• Renamed Isotopomer class to SpinSystem.
• Renamed isotopomers attribute from Simulator class to spin_systems.
• Renamed dimensions attribute from Simulator class to methods.
• Changed the default value of name and description attribute from the SpinSystem class from "" to None.

v0.3.0.b1

update readme and changelog

v0.3.0a0

What's new!

• ⭐ Improved simulation performance. ⭐

• Removed the Dimension class and added a new Method class instead.

• New methods for simulating the NMR spectrum:

  • BlochDecaySpectrum and
  • BlochDecayCentralTransitionSpectrum.

  The Bloch decay spectrum method simulates all p=Δm=-1 transition pathways, while the
  Bloch decay central transition selective spectrum method simulates all transition
  pathways with p=Δm=-1 and d=0.

• New Isotope, Transition, and ZeemanState classes.

• Every class now includes a reduced_dict() method. The reduced_dict method returns
  a dictionary with minimal key-value pairs required to simulate the spectrum. Note,
  this may cause metadata loss, if any.

• Added a label and description attributes to the Site class.

• Added a new label attribute to the SpinSystem class.

Bug fixes

• Fixed bug resulting from the rotation of the fourth rank tensor with non-zero euler
  angles.

Other changes

• Renamed the decompose attribute from the ConfigSimulator class to
  decompose_spectrum. The attribute is an enumeration with the following literals:

  • none: Computes a spectrum which is an integration of the spectra from all
    spin-systems.
  • spin_system: Computes a series of spectra each corresponding to a single
    spin-system.

• Renamed Isotopomer class to SpinSystem.

• Renamed isotopomers attribute from Simulator class to spin_systems.

• Renamed dimensions attribute from Simulator class to methods.

• Changed the default value of name and description attribute from the
  SpinSystem class from "" to None.