Changes from release to release

From 2.5.0 to 2.5.1

Major changes and bugfixes

From 2.2.0 to 2.5.0

Major new features

Simulation of cw EPR spectra in the slow-motional regime with chili.
Simulation of cw EPR spectra in the fast-motional regime with garlic.
Two new functions: plegendre for Legendre polynomials and associated Legendre polynomials, and spherharm for spherical and tesseral harmonics.
Two new functions to convert between rotation axis/angle and rotation matrix: rotaxi2mat and rotmat2axi.
Two new functions to convert between mT and MHz: mt2mhz and mhz2mt.

Major changes and bugfixes

Magnetic field ranges can be specified either by the center field and the sweep range (in the field CenterSweep) or by the minimum and the maximum (in the field Range).
All EPR simulation functions can automatically determine the magnetic field range.
All simulation functions plot the simulated spectrum, if no output arguments are requested.
Bug fixes: Non-equilibrium populations in pepper and resfields.

From 2.1.1 to 2.2.0

Major new features

pepper can now treat nuclei with small hyperfine couplings perturbationally, resulting in much better performance for systems with many nuclei.
pepper and salt can now simulate spectra of paramagnetic species oriented in the nematic phase of liquid crystals.
Exponential fitting with exponfit.
makespec constructs a stick spectrum from a list of peak positions and amplitudes.
Functions to add/remove spins from a spin sytem: nucspinadd and nucspinrmv.
Nuclear quadrupole moments and abundance data now availabe in isotopes, accessible via nucqmom and nucabund. barn gives the unit of quadrupole moments.
Support for angular momentum algebra: clebschgordan, wigner3j and wigner6j.

Major changes

The solution EPR simulation function garlic now computes resonance fields using analytical equations rather than perturbation theory formulas.
sop can now compute multiple spin matrices with a single call.
New input syntax for orisel.
stev can now compute extended Stevens operators for arbitrary k and q.
erot and eulang now accept/return Euler angles optionally as three separate arguments.
eulang now computes Euler angles from a rotation matrix by least-squares fitting, not via analytical expressions.

From 2.1.0 to 2.1.1

From 2.0 to 2.1.0

From 1.3.1 to 2.0

Many examples available on EasySpin web site.
Support for spin systems with an arbitrary number of electron spins.
resfields and pepper use a new and very robust algorithm for cw resonance field computation.
pepper and salt support isotropic and single-crystal spectra computation.
More physical constants, with values and uncertainties.
eprload reads in the parameter file in addition to the data file.
New functions: easyspin, levelsplot, apowin, voigtian, basecorr.
More flexible ctafft.
Many bug fixes.

From 1.3 to 1.3.1

Improved, clarified and corrected documentation, supplemented with many formulas.
Strict input checking for many functions.
Many bug fixes.

From 1.2 to 1.3

New functions: propint, convspec.
MATLAB version requirements downgraded from 6.1 to 6.0
If any function with required arguments is called without arguments, the help for this function is displayed.

From 1.1 to 1.2

resbef renamed to eigfields and substantially extended in functionality.
eulang restrictions relaxed, it now works for matrices with determinant slightly different from 1.
sop obtains a new and simplified syntax!
Many bugs fixed.

From 1.0 to 1.1

Nuclear spin database added. New functions nucdata, nucgval and nucspin.
Parameter order of evolve has changed.
For the functions pepper and salt the option parameters Width and Convolution have been eliminated.
In the spin system specification, flw has been renamed to HStrain.
resfields and pepper now explicitly exclude NMR transitions.
salt errors if orientation selection is too strong or the number of knots is not sufficient for reliable results.
A few EasySpin examples have been added to the package.
Many bug fixes.