# Changelog#

## Version 2#

### v2.2.x#

#### v2.2.0: I/O & CLI#

**2022-08-02**

I/O & CLI:

New Command-Line Interface (CLI) for the top-level modelling functions

`bipole`

,`dipole`

,`loop`

, and`analytical`

. Consult the manual for its description, or type in your terminal`empymod --help`

. Note that the CLI is a simple wrapper and currently lacks proper logging.New module

`io`

to save and load inputs and data.

Maintenance:

Improved load time by lazy-loading matplotlib and some scipy submodules.

Removed the file

`runtests.sh`

; uses`make`

instead.

### v2.1.x#

#### v2.1.4: Squeeze#

**2022-07-20**

The main modelling routines

`bipole`

,`dipole`

,`loop`

, and`analytical`

take a new keyword argument`squeeze`

, which is set to`True`

by default. If true, the output is squeezed (status quo); if false, the output is always a three-dimensional array`(nfreqtime, nrec, nsrc)`

.One can define new

`+np.infty`

as interface. Only use-case is to enforce a coordinate system in a two-layer case with an interface at`z`

(see example coordinate system in the educational section of the gallery).Documentation:

Expanded note on FFTLog.

Expanded note on coordinate system.

Changed the description from

`optional`

to`default: xyz`

in the main modelling routines.

Maintenance:

Use scipy through conda in CI.

Fix

`do_3d_projection`

for`matplotlib>3.5.0`

.

#### v2.1.3: Random noise example#

**2021-11-20**

New example: Random noise for f-domain CSEM data.

Maintenance:

Change in the njit-settings of

`kernel.wavenumber`

to work with`numba>=0.54`

.Cannot use

`matplotlib==3.5.0`

to build the gallery (matplotlib#21688).Move up the minimum matplotlib in the tests.

Added a Cron-job to run the tests monthly; every 20th at 14:14.

#### v2.1.2: Bugfix np.seterr(all=’ignore’)#

**2021-07-04**

Bumped the minimum requirements to:

Python 3.7

NumPy 1.17

SciPy 1.4

Numba 0.47

Legacy clean-up: The kernel of empymod used to switch off all NumPy errors via

`np.seterr(all='ignore')`

. That means that any script or library that used empymod switched off all warnings from NumPy, which is not good. Since empymod v2 this does make even less sense, as the entire kernel is jitted with numba.*This setting is therefore removed.*

#### v2.1.1: Bugfix azm/dip broadcasting#

**2021-06-23**

Bugfix in

`empymod.bipole`

and`empymod.loop`

when using various azimuths and dips (some cases used to cause a shape-mismatch error).

#### v2.1.0: Theme change & streamline#

**2021-05-30**

Streamline some things with emsig and emg3d:

Change theme from rtd to pydata.

New primary links https://emsig.xyz and https://empymod.emsig.xyz.

Move copyright from «The empymod Developers» to «The emsig community».

Slight rework of some parts of the docs.

### v2.0.x#

#### v2.0.6: Bugfix Windows int32/64#

**2021-03-26**

Bugfix Windows int32/64.

New example “Magnetotelluric”.

#### v2.0.5: M&B I#

**2021-03-01**

Maintenance and small bug fix:

Time-domain modelling failed when using DLF for the Fourier transform with

`pts_per_dec=0`

and`signal={-1;1}`

(broadcasting error).RTD fixes & changes and GitHub Action fixes; update year.

#### v2.0.4: Move to EMSiG#

**2020-12-09**

Small maintenance release:

Update github.com/empymod to github.com/emsig.

Moved from Travis CI to GitHub Actions.

#### v2.0.3: Docs and gallery#

**2020-09-22**

Documentation:

New section under

*Tips and tricks*regarding*Zero horizontal offset*.

Example gallery:

Re-organization of the section

*Reproducing*: split*CSEM*into the two examples, rename all.New example

*Hunziker et al., 2015*, in the section*Reproducing*.Update and maintain all of them.

Maintenance:

Take care of deprecation warnings:

Correct docs re

`htarg`

for`ht='quad'`

(`a`

/`b`

vs`lmin`

/`lmax`

).Sphinx: Ensure

`_html_repr_`

is captured by RTD and other small improvements.Chain errors.

Improve NumPy types.

#### v2.0.2: Fix example: `tem_walktem`

#

**2020-07-02**

Fix example

`tem_walktem`

, related to changes in`scipy.quadrature`

: Replace not-existing private name`scipy.integrate.quadrature._cached_roots_legendre`

with the public name`scipy.special.roots_legendre`

.As a consequence of the above, changed in

`empymod`

the used, old name`scipy.special.p_roots`

by new, more descriptive name`scipy.special.roots_legendre`

.Improve

*publications*-section in the example gallery.Change error reporting to native (instead of

`print(bla)`

and`raise Error`

do`raise Error(bla)`

); improve corresponding error testing by checking the error message too.

#### v2.0.1: Bug fixes: ftarg, docs, CI, req#

**2020-06-19**

Bugfix that using

`ftarg`

returned from`utils.check_time`

as input for the same`utils.check_time`

does not throw a warning in the case of`fftlog`

and`qwe`

.Various micro-improvements and simplifications with regards to the documentation, testing, and requirement specifications.

#### v2.0.0: Numba#

**2020-04-29**

This version is backwards incompatible and requires Python 3.6+.

Numba:

Using

`numexpr`

is no longer a possibility. Instead,`numba`

is a new dependency. All four kernel routines (`wavenumber`

,`greenfct`

,`reflections`

, and`fields`

) are now numba-jitted functions.

Removed:

Removed all deprecated functions.

Dropped support for Python 3.5; moved to f-strings.

Dropped testing for channel conda-forge. The problems encountered at the early development cycle of empymod with conda-forge do not exist any longer.

New defaults:

`EMArray`

:`.amp`

and`.pha`

are now methods, not properties. Phase takes three optional boolean parameters`deg=False`

,`unwrap=True`

, and`lag=True`

, to get radians or degrees; unwrapped or not; and lag or lead defined phases.The parameters

`epermV`

and`mpermV`

are set to the values of`epermH`

and`mpermH`

, respectively, if not provided (hence assuming isotropic behaviour). Before they were set to ones if not provided.

Renaming:

`transform.fht`

->`transform.hankel_dlf`

`transform.hqwe`

->`transform.hankel_qwe`

`transform.hquad`

->`transform.hankel_quad`

`transform.ffht`

->`transform.fourier_dlf`

`transform.fqwe`

->`transform.fourier_qwe`

`transform.fftlog`

->`transform.fourier_fftlog`

`transform.fft`

->`transform.fourier_fft`

`transform.fhti`

->`transform.get_fftlog_input`

`transform.get_spline_values`

->`transform.get_dlf_points`

.`factAng`

->`ang_fact`

In

`htarg`

-dict:`fftfilt`

->`dlf`

(filter name for Hankel-DLF)In

`ftarg`

-dict:`fhtfilt`

->`dlf`

(filter name for Fourier-DLF)In

`ftarg`

-dict:`ft`

->`kind`

(method in Fourier-DLF [sine/cosine])Only dictionaries allowed for

`htarg`

and`ftarg`

; strings, lists, or tuples are not allowed any longer. They are also dictionaries internally now.`ht`

: There is only one unique name for each method: ‘dlf’, ‘qwe’, ‘quad’.`ft`

: There is only one unique name for each method: ‘dlf’, ‘qwe’, ‘fftlog’, ‘fft’.Within

`transform`

, change`fhtarg`

,`qweargs`

, and`quadargs`

to`htarg`

;`qweargs`

to`ftarg`

.

Other changes:

All settings (

`xdirect`

,`ht`

,`htarg`

,`ft`

,`ftarg`

,`loop`

,`verb`

) are now extracted from`kwargs`

. This makes it possible that all`model`

-functions take the same keyword-arguments; warnings are raised if a particular parameter is not used in this function, but it doesn’t fail (it fails, however, for unknown parameters). Pure positional calls including those parameters will therefore not work any longer.Undo a change introduced in v1.8.0:

`get_dlf_points`

is calculated directly within`transform.fht`

[empymod#26].Ensured that source and receiver inputs are not altered.

Significantly reduced top namespace; only functions from

`model`

are loaded into the top namespace now.

## Version 1#

### v1.10.x#

#### v1.10.6: Various azimuths and dips at same depth#

**2020-03-04**

`empymod.bipole`

In the source and receiver format

`[x, y, z, azimuth, dip]`

, azimuth and dip can now be either single values, or the same number as the other coordinates.Bugfix (in

`utils.get_abs`

): When different orientations were used exactly along the principal axes, at the same depth, only the first source was calculated [empymod#74].

#### v1.10.5: Continuously in- or decreasing#

**2020-02-21**

This is a small appendix to v1.10.4: Depths can now be defined in increasing or decreasing order, as long as they are consistent. Model parameters have to be defined in the same order. Hence all these are possible:

`[-100, 0, 1000, 1050]`

-> left-handed system, low-to-high

`[100, 0, -1000, -1050]`

-> right-handed system, high-to-low

`[1050, 1000, 0, -100]`

-> left-handed system, high-to-low

`[-1050, -1000, 0, 100]`

-> right-handed system, low-to-high

#### v1.10.4: Positive z down- or upwards#

**2020-02-16**

New examples:

`empymod`

can handle positive z down- or upwards (left-handed or right-handed coordinate systems; it was always possible, but not known nor documented). Adjusted documentation, docstrings, and added an example.Example how to calculate the responses for the WalkTEM system.

Minor things and bug fixes:

Change from relative to absolute imports.

Simplified releasing (no badges).

Python 3.8 is tested.

Fix: numpy now throws an error if the third argument of

`logspace`

is not an`int`

, some casting was therefore necessary within the code.

#### v1.10.3: Sphinx Gallery#

**2019-11-11**

Move examples to an integrated Sphinx-Gallery, generated each time.

Move from conda-channel

`prisae`

to`conda-forge`

.Automatic deploy for PyPi and conda-forge.

#### v1.10.2: Always EMArray#

**2019-11-06**

Simplified and improved

`empymod.utils.EMArray`

. Now every returned array from the main modelling routines`bipole`

,`dipole`

,`loop`

, and`analytical`

is an EMArray with`.amp`

- and`.pha`

-attributes.Theme and documentation reworked, to be more streamlined with

`emg3d`

(for easier long-term maintenance).Travis now checks all the url’s in the documentation, so there should be no broken links down the road. (Check is allowed to fail, it is visual QC.)

Fixes to the

`setuptools_scm`

-implementation (`MANIFEST.in`

).`ROADMAP.rst`

moved to GitHub-Projects;`MAINTENANCE.rst`

included in manual.

#### v1.10.1: setuptools_scm#

**2019-10-22**

Typos from v1.10.0; update example in

`model.loop`

.Implement

`setuptools_scm`

for versioning (adds git hashes for dev-versions).

#### v1.10.0: Loop source and receiver#

**2019-10-15**

New modelling routine

`model.loop`

to model the electromagnetic frequency- or time-domain field due to an arbitrary rotated, magnetic source consisting of an electric loop, measured by arbitrary rotated, finite electric or magnetic bipole receivers or arbitrary rotated magnetic receivers consisting of electric loops.Move copyright from «Dieter Werthmüller» to «The empymod Developers», to be more inclusive and open the project for new contributors.

### v1.9.x#

#### v1.9.0 : Laplace#

**2019-10-04**

Laplace-domain calculation: By providing a negative

`freq`

-value, the calculation is carried out in the real Laplace domain`s = freq`

instead of the complex frequency domain`s = 2i*pi*freq`

.Improvements to filter design and handling:

`DigitalFilter`

now takes an argument (list of strings) for additional coefficients to the default`j0`

,`j1`

,`sin`

, and`cos`

.`fdesign`

can now be used with any name as attribute you want to describe the transform pair (until now it had to be either`j0`

,`j1`

,`j2`

,`sin`

, or`cos`

).The provided sine and cosine transform pairs in

`fdesign`

can now be asked to return the inverse pair (time to frequency).

Other tiny improvements and bug fixes.

### v1.8.x#

#### v1.8.3 : Scooby#

**2019-07-05**

Use

`scooby`

for`Versions`

(printinfo), change name to`Report`

.DOC: Correct return statement if

`mrec=True`

.Typos and correct links for new asv/bench.

Bump requirement to SciPy>=1.0.0, remove warning regarding memory leak in SciPy 0.19.0.

#### v1.8.2 : pts_per_dec for DLF are now floats#

**2019-04-26**

`pts_per_dec`

are now floats, not integers, which gives more flexibility.Bugfix:

`pts_per_dec`

for DLF was actually points per`e`

, not per decade, as the natural logarithm was used.New

`Versions`

-class; improvement over the`versions`

-function, as it automatically detects if it can print html or not.Maintenance: Update

`np.load`

in tests with`allow_pickle=True`

for changes in numpy v1.16.3.Lots of changes to accommodate

`emg3d`

within the`empymod`

-org:Adjust website, move stuff from website into README.md.

/empymod/example-notebooks -> /empymod/empymod-examples.

/empymod/asv -> /empymod/empymod-asv (and therefore now available at empymod.github.io/empymod-asv).

/empymod/bench -> /empymod/empymod-bench.

Move manual from

`empymod/__init__.py`

to the`docs/manual.rst`

, and the references to its own file. Change reference style.Move credits for initial funding from the license-section of the manual to CREDITS.rst, where it belongs.

#### v1.8.1 : Version of Filter-article and CSEM-book#

**2018-11-20**

Many little improvements in the documentation.

Some code improvements through the use of codacy.

Remove testing of Python 3.4; officially supported are now Python 3.5-3.7.

Version of the filter article (DLF) in geophysics and of the CSEM book.

#### v1.8.0 : Hook for Cole-Cole IP and similar#

**2018-10-26**

`model.bipole`

,`model.dipole`

, and`model.analytical`

have now a hook which users can exploit to insert their own calculation of`etaH`

,`etaV`

,`zetaH`

, and`zetaV`

. This can be used, for instance, to model a Cole-Cole IP survey. See the manual or the example-notebooks for more information.`model.wavenumber`

renamed to`model.dipole_k`

to avoid name clash with`kernel.wavenumber`

. For now`model.wavenumber`

continues to exist, but raises a deprecation warning.`xdirect`

default value changed from`True`

to`False`

.Possibility to provide interpolated points (

`int_pts`

) to`transform.dlf`

.

The following changes are backwards incompatible if you directly used
`transform.fht`

, `transform.hqwe`

, or `transform.hquad`

. Nothing changes
for the user-facing routines in `model`

:

`empymod.fem`

now passes`factAng`

to`empymod.transform`

, not`angle`

; this saves some time if looped over offsets or frequencies, as it is not repeatedly calculated within`empymod.transform`

.Use

`get_spline_values`

in`empymod.fem`

for Hankel DLF, instead of in`empymod.fht`

. Gives a speed-up if looped over offsets or frequencies. Should be in`utils`

, but that would be heavily backwards incompatible. Move there in version 2.0.

### v1.7.x#

#### v1.7.3 : Speed improvements following benchmarks#

**2018-07-16**

Small improvements related to speed as a result of the benchmarks introduced in v1.7.2:

Kernels which do not exist for a given

`ab`

are now returned as`None`

from`kernel.wavenumber`

instead of arrays of zeroes. This permits for some time saving in the transforms. This change is backwards incompatible if you directly used`kernel.wavenumber`

. Nothing changes for the user-facing routines in`model`

.Adjustments in

`transform`

with regard to the`None`

returned by`kernel.wavenumber`

. The kernels are not checked anymore if they are all zeroes (which can be slow for big arrays). If they are not None, they will be processed.Various small improvements for speed to

`transform.dlf`

(i.e.`factAng`

;`log10`

/`log`

; re-arranging).

#### v1.7.2 : Benchmarked with asv#

**2018-07-07**

Benchmarks:

`empymod`

has now a benchmark suite, see emsig/empymod-asv.Fixed a bug in

`bipole`

for time-domain responses with several receivers or sources with different depths. (Simply failed, as wrong dimension was provided to`tem`

).Small improvements:

Various simplifications or cleaning of the code base.

Small change (for speed) in check if kernels are empty in

`transform.dlf`

and`transform.qwe`

.

#### v1.7.1 : Load/save filters in plain text#

**2018-06-19**

New routines in

`empymod.filters.DigitalFilter`

: Filters can now be saved to or loaded from pure ascii-files.Filters and inversion result from

`empymod.scripts.fdesign`

are now by default saved in plain text. The filters with their internal routine, the inversion result with`np.savetxt`

. Compressed saving can be achieved by giving a name with a ‘.gz’-ending.Change in

`empymod.utils`

:Renamed

`_min_param`

to`_min_res`

.Anisotropy

`aniso`

is no longer directly checked for its minimum value. Instead, res*aniso**2, hence vertical resistivity, is checked with`_min_res`

, and anisotropy is subsequently re-calculated from it.The parameters

`epermH`

,`epermV`

,`mpermH`

, and`mpermV`

can now be set to 0 (or any positive value) and do not depend on`_min_param`

.

`printinfo`

: Generally improved; prints now MKL-info (if available) independently of`numexpr`

.Simplification of

`kernel.reflections`

through re-arranging.Bug fixes

Version of re-submission of the DLF article to geophysics.

#### v1.7.0 : Move empyscripts into empymod.scripts#

**2018-05-23**

Merge `empyscripts`

into `empymod`

under `empymod.scripts`

.

Clear separation between mandatory and optional imports:

Mandatory:

`numpy`

`scipy`

Optional:

`numexpr`

(for`empymod.kernel`

)`matplotlib`

(for`empymod.scripts.fdesign`

)`IPython`

(for`empymod.scripts.printinfo`

)

Broaden namespace of

`empymod`

. All public functions from the various modules and the modules from`empymod.scripts`

are now available under`empymod`

directly.

### v1.6.x#

#### v1.6.2 : Speed improvements for QUAD/QWE#

**2018-05-21**

These changes should make calculations using `QWE`

and `QUAD`

for the
Hankel transform for cases which do not require all kernels faster; sometimes
as much as twice as fast. However, it might make calculations which do require
all kernels a tad slower, as more checks had to be included. (Related to
[empymod#11]; basically
including for `QWE`

and `QUAD`

what was included for `DLF`

in version
1.6.0.)

`transform`

:`dlf`

:Improved by avoiding unnecessary multiplications/summations for empty kernels and applying the angle factor only if it is not 1.

Empty/unused kernels can now be input as

`None`

, e.g.`signal=(PJ0, None, None)`

.`factAng`

is new optional for the Hankel transform, as is`ab`

.

`hqwe`

: Avoids unnecessary calculations for zero kernels, improving speed for these cases.`hquad`

,`quad`

: Avoids unnecessary calculations for zero kernels, improving speed for these cases.

`kernel`

:Simplify

`wavenumber`

Simplify

`angle_factor`

#### v1.6.1 : Primary/secondary field#

**2018-05-05**

Secondary field calculation.

Add the possibility to calculate secondary fields only (excluding the direct field) by passing the argument

`xdirect=None`

. The complete`xdirect`

-signature is now (only affects calculation if src and rec are in the same layer):If True, direct field is calculated analytically in the frequency domain.

If False, direct field is calculated in the wavenumber domain.

If None, direct field is excluded from the calculation, and only reflected fields are returned (secondary field).

Bugfix in

`model.analytical`

for`ab=[36, 63]`

(zeroes) [empymod#16].

#### v1.6.0 : More DLF improvements#

**2018-05-01**

This release is not completely backwards compatible for the main modelling
routines in `empymod.model`

, but almost. Read below to see which functions
are affected.

Improved Hankel DLF [empymod#11].

`empymod.kernel.wavenumber`

always returns three kernels,`PJ0`

,`PJ1`

, and`PJ0b`

. The first one is angle-independent, the latter two depend on the angle. Now, depending of what source-receiver configuration is chosen, some of these might be zero. If-statements were now included to avoid the calculation of the DLF, interpolation, and reshaping for 0-kernels, which improves speed for these cases.Unified DLF arguments [empymod#10].

These changes are backwards compatible for all main modelling routines in

`empymod.model`

. However, they are not backwards compatible for the following routines:`empymod.model.fem`

(removed`use_spline`

),`empymod.transform.fht`

(removed`use_spline`

),`empymod.transform.hqwe`

(removed`use_spline`

),`empymod.transform.quad`

(removed`use_spline`

),`empymod.transform.dlf`

(`lagged`

,`splined`

=>`pts_per_dec`

),`empymod.utils.check_opt`

(no longer returns`use_spline`

),`empymod.utils.check_hankel`

(changes in`pts_per_dec`

), and`empymod.utils.check_time`

(changes in`pts_per_dec`

).

The function

`empymod.utils.spline_backwards_hankel`

can be used for backwards compatibility.Now the Hankel and Fourier DLF have the same behaviour for

`pts_per_dec`

:`pts_per_dec = 0`

: Standard DLF,`pts_per_dec < 0`

: Lagged Convolution DLF, and`pts_per_dec > 0`

: Splined DLF.

**There is one exception**which is not backwards compatible: Before, if`opt=None`

and`htarg={pts_per_dec: != 0}`

, the`pts_per_dec`

was not used for the FHT and the QWE. New, this will be used according to the above definitions.Bugfix in

`model.wavenumber`

for`ab=[36, 63]`

(zeroes).

### v1.5.x#

#### v1.5.2 : Improved DLF#

**2018-04-25**

DLF improvements:

Digital linear filter (DLF) method for the Fourier transform can now be carried out without spline, providing 0 for

`pts_per_dec`

(or any integer smaller than 1).Combine kernel from

`fht`

and`ffht`

into`dlf`

, hence separate DLF from other calculations, as is done with QWE (`qwe`

for`hqwe`

and`fqwe`

).Bug fix regarding

`transform.get_spline_values`

; a DLF with`pts_per_dec`

can now be shorter then the corresponding filter.

#### v1.5.1 : Improved docs#

**2018-02-24**

Documentation:

Simplifications: avoid duplication as much as possible between the website (empymod.github.io), the manual (empymod.readthedocs.io), and the

`README`

(github.com/empymod/empymod).Website has now only

*Features*and*Installation*in full, all other information comes in the form of links.`README`

has only information in the form of links.Manual contains the

`README`

, and is basically the main document for all information.

Improvements: Change some remaining

`md`

-syntax to`rst`

-syntax.FHT -> DLF: replace FHT as much as possible, without breaking backwards compatibility.

#### v1.5.0 : Hankel filter wer_201_2018#

**2018-01-02**

Minimum parameter values can now be set and verified with

`utils.set_minimum`

and`utils.get_minimum`

.New Hankel filter

`wer_201_2018`

.`opt=parallel`

has no effect if`numexpr`

is not built against Intel’s VML. (Use`import numexpr; numexpr.use_vml`

to see if your`numexpr`

uses VML.)Bug fixes

Version of manuscript submission to geophysics for the DLF article.

### v1.4.x#

#### v1.4.4 : TE/TM split#

**2017-09-18**

[This was meant to be 1.4.3, but due to a setup/pypi/anaconda-issue I had to push it to 1.4.4; so there isn’t really a version 1.4.3.]

Add TE/TM split to diffusive ee-halfspace solution.

Improve

`kernel.wavenumber`

for fullspaces.Extended

`fQWE`

and`fftlog`

to be able to use the cosine-transform. Now the cosine-transform with the real-part frequency response is used internally if a switch-off response (`signal=-1`

) is required, rather than calculating the switch-on response (with sine-transform and imaginary-part frequency response) and subtracting it from the DC value.Bug fixes

#### v1.4.2 : Final submission version of Geophysics paper#

**2017-06-04**

Bugfix: Fixed squeeze in

`model.analytical`

with`solution='dsplit'`

.Version of final submission of manuscript to Geophysics.

#### v1.4.1 : Own organisation github.com/empymod#

**2017-05-30**

[This was meant to be 1.4.0, but due to a setup/pypi/anaconda-issue I had to push it to 1.4.1; so there isn’t really a version 1.4.0.]

New home: empymod.github.io as entry point, and the project page on github.com/empymod. All empymod-repos moved to the new home.

/prisae/empymod -> /empymod/empymod

/prisae/empymod-notebooks -> /empymod/example-notebooks

/prisae/empymod-geo2017 -> /empymod/article-geo2017

/prisae/empymod-tle2017 -> /empymod/article-tle2017

Modelling routines:

New modelling routine

`model.analytical`

, which serves as a front-end to`kernel.fullspace`

or`kernel.halfspace`

.Remove legacy routines

`model.time`

and`model.frequency`

. They are covered perfectly by`model.dipole`

.Improved switch-off response (calculate and subtract from DC).

`xdirect`

adjustments:`isfullspace`

now respects`xdirect`

.Removed

`xdirect`

from`model.wavenumber`

(set to`False`

).

Kernel:

Modify

`kernel.halfspace`

to use same input as other kernel functions.Include time-domain ee halfspace solution into

`kernel.halfspace`

; possible to obtain direct, reflected, and airwave separately, as well as only fullspace solution (all for the diffusive approximation).

### v1.3.x#

#### v1.3.0 : New transforms QUAD (Hankel) and FFT (Fourier)#

**2017-03-30**

Add additional transforms and improve QWE:

Conventional adaptive quadrature (QUADPACK) for the Hankel transform;

Conventional FFT for the Fourier transform.

Add

`diff_quad`

to`htarg`

/`ftarg`

of QWE, a switch parameter for QWE/QUAD.Change QWE/QUAD switch from comparing first interval to comparing all intervals.

Add parameters for QUAD (a, b, limit) into

`htarg`

/`ftarg`

for QWE.

Allow

`htarg`

/`ftarg`

as dict additionally to list/tuple.Improve

`model.gpr`

.Internal changes:

Rename internally the sine/cosine filter from

`fft`

to`ffht`

, because of the addition of the Fast Fourier Transform`fft`

.

Clean-up repository

Move

`notebooks`

to /prisae/empymod-notebooksMove

`publications/Geophysics2017`

to /prisae/empymod-geo2017Move

`publications/TheLeadingEdge2017`

to /prisae/empymod-tle2017

Bug fixes and documentation improvements

### v1.2.x#

#### v1.2.1 : Installable via pip and conda#

**2017-03-11**

Change default filter from

`key_401_2009`

to`key_201_2009`

(because of warning regarding 401 pt filter in source code of`DIPOLE1D`

.)Since 06/02/2017 installable via pip/conda.

Bug fixes

#### v1.2.0 : Bipole#

**2017-02-02**

New routine:

General modelling routine

`bipole`

(replaces`srcbipole`

): Model the EM field for arbitrarily oriented, finite length bipole sources and receivers.

Added a test suite:

Unit-tests of small functions.

Framework-tests of the bigger functions:

Comparing to status quo (regression tests),

Comparing to known analytical solutions,

Comparing different options to each other,

Comparing to other 1D modellers (EMmod, DIPOLE1D, GREEN3D).

Incorporated with Travis CI and Coveralls.

Internal changes:

Add kernel count (printed if verb > 1).

`numexpr`

is now only required if`opt=='parallel'`

. If`numexpr`

is not found,`opt`

is reset to`None`

and a warning is printed.Cleaned-up wavenumber-domain routine.

theta/phi -> azimuth/dip; easier to understand.

Refined verbosity levels.

Lots of changes in

`utils`

, with regards to the new routine`bipole`

and with regards to verbosity. Moved all warnings out from`transform`

and`model`

into`utils`

.

Bug fixes

### v1.1.x#

#### v1.1.0 : Include source bipole#

**2016-12-22**

New routines:

New

`srcbipole`

modelling routine: Model an arbitrarily oriented, finite length bipole source.Merge

`frequency`

and`time`

into`dipole`

. (`frequency`

and`time`

are still available.)`dipole`

now supports multiple sources.

Internal changes:

Replace

`get_Gauss_Weights`

with`scipy.special.p_roots`

`jv(0,x)`

,`jv(1,x)`

->`j0(x)`

,`j1(x)`

Replace

`param_shape`

in`utils`

with`_check_var`

and`_check_shape`

.Replace

`xco`

and`yco`

by`angle`

in`kernel.fullspace`

Replace

`fftlog`

with python version.Additional sine-/cosine-filters:

`key_81_CosSin_2009`

,`key_241_CosSin_2009`

, and`key_601_CosSin_2009`

.

Bug fixes

### v1.0.x#

#### v1.0.0 : Initial release#

**2016-11-29**

Initial release; state of manuscript submission to geophysics.