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octsympy 2.8.0 (2019-04-30)
===========================
* New symbolic commands:
eval
ezmesh
find
sinc
* Update minimum versions of SymPy to 1.2 and Octave to 4.2.
* Fixes for SymPy 1.4.
* Newer SymPy versions improve QR and LU on non-square matrices.
* Support for expressions with min and max such as `min(x, y)`.
* `subs(f)` now works: it finds values from the workspace.
* `gammainc` now regularized correctly.
* `lambertw` has more consistent printing.
* Other bug fixes and documentation updates.
octsympy 2.7.1 (2018-10-02)
===========================
* New symbolic commands:
numdem
* Fixes for SymPy 1.3.
* Various bug fixes and documentation updates.
octsympy 2.7.0 (2018-07-12)
===========================
* New symbolic commands:
arg
euler
ezcontour
* New `@double` numerical functions; these are wrappers around SymPy,
so they are slower than native floating-point implementations.
bernoulli euler
chebyshevT pochhammer
chebyshevU
* The initial startup is much quieter!
* `vpa` now warns of low-precision on non-numbers strings with decimals
such as `vpa('cos(0.1)')`. See "help vpa" for details.
* `subs` allows multiple scalar variables to be replaced with symbolic
matrix expressions.
* symfun can be evaluated at symbolic matrices: `f(sym([1 2; 3 4]))`
now works where `f(x)` is a symfun.
* Fixes for symfuns such as `syms N(t)` where the function name
conflicts with a SymPy command.
* Fixes for how assumptions interact with symfuns.
* New command `sympref diagnose` to help debug Python/SymPy issues.
* Improve `function_handle` support by supporting more functions.
* Fixes for several bugs mentioning "immutable matrices".
* `bernoulli` now works with array inputs.
* Added a `private/defaultpython.m` to make it easier for distributors
to control which python interpreter is used by default.
* Fixes for GNU Octave 4.4.
* Fixes for SymPy 1.2.
* Various bug fixes and documentation updates.
octsympy 2.6.0 (2017-07-27)
===========================
* New symbolic commands:
ellipke ellipticE harmonic
ellipticCE ellipticF kroneckerDelta
ellipticCK ellipticK pochhammer
ellipticCPi ellipticPi
* New `@double` numerical functions; these are wrappers around SymPy,
so they are slower than native floating-point implementations.
harmonic
* Support for the new SymPy 1.1.1.
* `solve` now supports vectors of equations and vectors of variables.
* Better warning for `sym(0.1)`, updated docs about floating point.
* Double values can now be converted to their exact rational value
using `sym(0.1, 'f')`. Passing `'r'` gives the current heuristic
behaviour. Neither raises a warning.
* The default floating-point heuristics now check for square roots of
integers, so `sym(sqrt(2))` should work.
* `sym('i')` and `sym('I')` no longer create the imaginary unit: use
`sym(i)` or `sym(1i)`.
* `sym(e)` now gives the same as `exp(sym(1))`. However, `sym('e')`
and `syms e` continue to create a variable named `e`.
* `sym` now accepts function handles such as anonymous functions as
inputs.
* `subs` is not approriate for numerical evaluation; add an example in
`help subs` which shows how to do this with `function_handle`.
* Calling `sym(cell)` now creates a sym array instead of a cell array.
Old behaviour of creating a cell array was deprecated in 2.5.0.
* Bug fix: isequal(n) for symfun's correctly tests the argnames.
octsympy 2.5.0 (2017-02-01)
===========================
* New symbolic commands:
acosd chol ones
adjoint cosd prevprime
angle dawson sind
asind divisors sympy
atand equationsToMatrix tand
beta eye zeros
cell2sym hilb
charpoly invhilb
* Add more `@double` numerical functions. For now these are simply
wrappers around SymPy, so they are slower than native floating
point implementations.
coshint logint
cosint polylog
dilog sinhint
fresnelc sinint
fresnels zeta
* The full set of assumptions implemented by Sympy can now be used.
For example, `syms p prime` assumes `p` is prime.
* `assume(x, 'clear')` can be used to clear assumptions on variables.
Previously undocumented commands such as `sym(x, 'clear')` and
`syms x clear` are now deprecated.
* `assume` supports vector inputs. Also supported are alternative
"command forms" such as `assume x y real` and `assume x y clear`.
* `solve` now works with inequalities.
* `sym('1.3')` now creates the rational number 13/10.
* A new keyword option `coeffs(f, x, 'all')` returns both zero and
non-zero coefficients.
* Change (and document!) default matrix norm to the 2-norm (it was
Frobenius).
* `heaviside` accepts a second argument for its value at zero.
* `isfinite` behaves correctly for variables (and is documented).
* New experimental Python communication using the native Python/C
interface, due to Abhinav Tripathi during Google Summer of Code 2016.
* Bug fix: assign `[]` to row/column removes that that row/column.
* `char(x)` now gives a more human-readable output, useful for example
in labelling a figure.
* ezplot supports implicit plotting of f(x, y) == 0.
* Deprecation notice: `sym(cell)` will soon create a sym array
(currently it creates a cell array of sym objects, and issues a
warning).
* Deprecation notice: `evalpy` will be removed in a future release.
* Remove deprecated method for changing the Python executable using
`sympref`: instead use the environment variable `PYTHON`.
* Update minimum versions of SymPy to 1.0 and Octave to 4.0.0, so
we can remove some crufty workarounds.
octsympy 2.4.0 (2016-05-24)
===========================
* New symbolic commands:
acsc csch gammaln polylog
asec dilog hypergeom psi
asech ei hypot resize
besseljn expint igamma sech
besselyn ezsurf jordan signIm
cat fresnelc laguerreL sinint
cosint fresnels lgamma sinhint
coshint gammainc logint ssinint
* Move some functions from the "specfun" package. So now the Symbolic
package includes some numerical (@double/@single) implementations:
dirac
heaviside
laguerreL
lambertw
* Re-implement @double/laguerreL for numerical stability.
* Add spherical Bessel functions: these are called `besseljn` and
`besselyn` (for now, subject to change). Thanks to Utkarsh Gautam.
* Fix: `@sym/dot` consistent with `@double/dot` thanks to Alex Vong.
* The environment variable `PYTHON` controls which Python executable is
used. The command
`sympref python C:\bin\python`
has been deprecated; instead please use:
`setenv PYTHON C:\bin\python`
* Improve support for Windows. Thanks to Abhinav Tripathi, Tatsuro
Matsuoka, finalsnd, and Mike Miller.
* Installation scripts merely warn if Python and SymPy aren't found.
octsympy 2.3.0 (2016-04-08)
===========================
* New commands:
airy chebyshevU finiteset rewrite
besselj chebyshevT has round
bessely fix kron sort
besseli frac linspace union
besselk intersect logspace unique
besselh interval max
cbrt ismember min
* Bug fix for working with certain unevaluated integrals.
* Bug fixes for function_handle, fortran and ccode.
* Bug fixes or improvements to repmat, reshape, python_cmd, factor,
dot star, children.
* Support for SymPy 1.0.
* Errors raised in Python code are now caught and passed back to Octave
in most cases. This simplifies implementation.
- Note some error messages have changed slightly.
- Windows users now see previously hidden error messages.
Thanks to @latot.
* Windows "bundle" package should work even if the system has another
Python installed. Thanks to Abhinav Tripathi.
* Installation bug fixes. Thanks to Abhinav Tripathi and Mike Miller.
* New functions for converting sym to integers. Thanks to @latot.
* Making a sym of a large integer like `sym(10^16)` gives a warning.
Please use `sym(10)^16` or `sym('1000000000000123456789').
* New functions for dealing with sets and intervals and operations
on them, thanks to @latot.
* 2D Taylor expansions are implemented, thanks to Utkarsh Gautam.
* Sort is implemented, thanks to Utkarsh Gautam.
* Fourier and Laplace transforms (and their inverses) use a
different implementation which improves handling of delta
functions. Ideally, a later version will consolidate this with
SymPy's original implementations.
* Python `None` can be returned and manipulated.
* Saving/Loading sym objects is now fully-supported (thanks to Abhinav
Tripathi).
* Documentation improvements.
octsympy 2.2.4 (2015-12-14)
===========================
* Fix display on Octave 3.8.
* Support for SymPy 0.7.6.1.
octsympy 2.2.3 (2015-11-25)
===========================
* New commands:
cross
dot
* sym('var') is more robust in case var happens to be a special
value in SymPy. Now sym('E') is just a symbol rather than
exp(sym(1)). Also sym('E1') and sym('Eq') no longer give errors.
* Fix bug in assigning to column vectors, thanks to Grzegorz Dudziuk.
* During install, test for PATH problems on Windows (issue #236).
* Fix for Octave 4.1+ development versions, thanks to Mike Miller.
octsympy 2.2.2 (2015-07-03)
===========================
* Fix for configure script using Python 3 (thanks Vadim Gribanov).
* Fourier transform fixes (thanks Alexander Misel, Andrés Prieto).
They now follow the non-unitary angular frequency convention.
* Support for SymPy 0.7.7.dev version.
* Add some warnings to the documentation about unreliable results
for "dsolve" on systems and from Fourier transforms.
* Start using "print_usage" for invalid inputs as is common
practice in Octave.
* Bug fixes and update doctests.
octsympy 2.2.1 (2015-04-22)
===========================
* Fix an ascii pretty printing regression (issue #234).
* Other minor fixes for doctests, sympref and symreplace.
octsympy 2.2.0 (2015-04-20)
===========================
* New commands:
catalan
eulergamma
lambertw
* Installing symbolic package now check for Python and minimum
version of SymPy (thanks Carnë Draug for autoconf).
* Installations from Octave-Forge ("pkg install -forge symbolic")
should now work on Windows (thanks vassbu). You will need the
Python and SymPy dependencies. Or you can use the [bundled
package](https://github.com/cbm755/octsympy/releases)
* Added support for Python 3 (still works with Python 2 as well).
* Documentation improvements especially to assumptions. Examples
within documentation can now be tested with doctests, see the
`octsympy_doctests.m` function.
* Fix a warning on Octave 4.0.0-rc1 and make tests work properly.
* Other bug fixes: assumptions; symvar and symbolic matrix powers;
various display issues.
octsympy 2.1.0 (2015-03-06)
===========================
* New commands:
columns
degree
formula
ismatrix
numden
rows
* Additional ways of calling symsum, symprod, and subs for better
compatibility with other symbolic toolboxes.
* Bug fixes in poly2sym, sym2poly, symfun (thanks @rocketsound),
prod, horner, coeffs.
* Documentation improvements.
* Improvements to "argnames" and "formula" for the dependent
variables and dependent expression of a symfun. These are now
implemented for basic sym objects as well.
* Improvements to assumptions. E.g., `x = assume(x, 'positive')` no
longer mucks around in the workspace for other instances of x (it
still does this with no output argument, for compatibility with
other symbolic toolboxes). You can use multiple assumptions with
sym and syms, e.g., `syms n m positive even`.
* Improve symbolic sized matrices such as `A = sym('a', [n m])`.
These are still experimental; they correspond to MatixSymbols in
SymPy and may need a recent SymPy development version. For now,
the `size(A)` returns "1x1" although internally `NaN` is used for
symbolic-sized dimensions. Enabling `size(A)` to return "NaNx3"
may occur later.
* Drop python_cmd_string, which has been deprecated since v0.1.1.
octsympy 2.0.0 (2015-02-04)
===========================
* Octsympy is now the "symbolic" package for Octave Forge. There
was a previous "symbolic" package (based on GiNaC) which reached
version 1.1.0. To prevent confusion, we are now at version 2.0.0.
Additionally, the history of the two projects has been merged
(thanks Carnë Draug).
* New commands:
coeffs
ipermute
isallconstant
isconstant
nchoosek
permute
* Fixes for development version of SymPy.
* Fixes for vpa and vpasolve: high precision should be more reliable.
* Improve handling `sym(pi/3)` and other small fractions of pi. It
works but you'll still get a warning and 2*sym(pi)/3 is really the
preferred approach! `sym(-pi)` now works.
* On Windows, default to ascii rendering for now (until unicode
is fixed in Octave on that platform).
* No longer needs to autogenerate a bunch of functions at install
time: hopefully making it easier than ever to get involved!
octsympy 0.1.3 (2015-01-06)
===========================
* New commands:
argnames partfrac
digits orth
ilaplace rank
laplace rref
ldivide sum
mldivide vpa
null vpasolve
* Symbolic backslash support.
* variable-precision arithmetic support: see vpa, digits, vpasolve.
* Much-improved dsolve thanks to Andrés Prieto.
* Laplace and inverse Laplace transforms (Andrés Prieto).
* Partial fractions (Andrés Prieto).
* Improvements to solve (Andrés Prieto).
* Preliminary support for matrix expressions, e.g., matrix to a symbolic
power.
* Should work properly with Stand-alone Python (thanks to David Manthey).
octsympy 0.1.2 (2014-12-01)
===========================
* New commands:
children rhs
expm setdiff
lhs setxor
pinv trace
potential
* Support new SymPy 0.7.6. This adds Octave code generation which means
that OctSymPy's `matlabFunction` is supported.
* For now, SymPy 0.7.5 should still work, but upgrading to SymPy 0.7.6 is
recommended.
octsympy 0.1.1 (2014-10-20) Rose Garden
========================================
Major Changes
-------------
* Fix sym(double) approx by rationals (issue #121, thanks HuiZhong LU).
* Improvements to sym() command: you can now pass the underlying "srepr"
SymPy presentation to create an object.
* Bug fixes: improvements to indexing, findsymbols and assumptions,
isscalar/isvector failures on recent Octave, output formatting fixes,
* New commands:
and isscalar
char isvector
diag nnz
eig or
iscolumn uplus
isrow xor
Minor Changes
-------------
* Improvements to logical and isAlways commands.
* IPC system() should work on windows.
* Better test system, easier to see "real" failures rather than expected
(known) failures.
* Improved handling of symfuns.
* Improvements to internal string handling/escaping especially newlines.
- Enter a multiline command using a cell array of lines e.g.,
`python_cmd({'a = 10' 'return (a, 2*a)'})
or
`python_cmd({'a = 10'; 'return (a, 2*a)'})
- The same applies to `evalpy`. If you need the old deprecated
behaviour, it is still available as `python_cmd_string`.
octsympy 0.1.0 (2014-08-27) Pacific Coffee
===========================================
Major Changes
-------------
* `sympref` replaces `octsympy_config`. You can change the Python
interpreter with `sympref python /path/to/python`.
* Unicode pretty-printed output by default.
- If you see `?` or other broken characters, try `sympref display
ascii`. Then help me get this working on your system!
- Or `sympref display flat` to disable pretty-printing. (You can
still use the `pretty` command selectively).
* Experimental Windows package with Python and SymPy included (look
Ma, no deps!) Uses [David Manthey's single file py.exe Python] [1].
[1]: http://www.orbitals.com/programs/pyexe.html
* Lots of new commands:
atan2 fliplr isfinite norm
ccode flipud isna not
cond fortran jacobian qr
conj ge laplacian real
curl gradient le repmat
det gt lt svd
divergence hessian lu toeplitz
ezplot3 imag matlabFunction tril
ezplot inv ne triu
* Preliminary code generation (`ccode`, `fortran` and
`matlabFunction` functions). However, `matlabFunction` mostly
depends on patches not yet in upstream SymPy.
* Inequality support.
* Assumptions now behave more like the Matlab Symbolic Math Toolbox.
Minor or internal changes
-------------------------
* Arithmetic operations on symfuns return symfuns instead of syms.
* More robust XML-like IPC transport.
* Move to proper Octave-style `%!` tests.
* Debugging IPC modes: `systmpfile` (same as `system` but outputs a
temp file for inspection) and `sysoneline` (work-in-progress).
octsympy 0.0.4 (2014-05-26) Lovever Coffee
===========================================
* Basic assumptions support.
* Matlab packages, only slow system() ipc for now.
* Improvements on passing variables between Octave and Python.
octsympy 0.0.3 (2014-04-29) Wu Ke Song
=======================================
* Many new commands.
* `system()` communication no longer makes temporary files. To
change the communication mechanism, use "octsympy_config ipc
system". See also "help octsympy_config".
* Added new tool "evalpy", this is fun and good for debugging...
* Bugs fixed, docs updated
* Start documenting differences with the Matlab Symbolic Math
Toolbox.
octsympy 0.0.2 (2014-04-20)
===========================
* A preview release, test it out report issues. Documentation is a
mess, various things are work-in-progress. But it works and I
think has potential.