The Nelson Programming Language
Python interface (part 2):
pyenv: can use environment variables to set values.getenv: Retrieve the values of several environment variables.
pyenv: can use environment variables to set values.
pyrun: Python code object allowed as first input argument.
nelson --without_python starts nelson without python engine.
skip_testsuite: allows to skip test suite dynamically on condition.
copyfile, isfile, isdir, mkdir allow string array type as input.single(int64([1 2; 3 4])) returned a wrong value.py.tuple, py.list compatibility increased.pyenv did not manage python's path with space on Windows.Python interface (part 1):
pyenv Change default environment of Python interpreter.pyrun Run Python statements from Nelson.ArchLinux packaging (https://aur.archlinux.org/packages/nelson-git).
contour Contour plot of matrix.
contour3 3-D contour plot.
shiftdim Shift array dimensions.
xcorr2 2-D cross-correlation.
deconv Deconvolution and polynomial division.
vecnorm Vector-wise norm.
normpdf Normal probability density function.
#310 gammaln Logarithm of gamma function.
#1112 gradient Numerical gradient.
#1126 isspace Determine which characters are space characters.
struct supports scalar string array as field name.gcd without argument returned wrong error message.Export to ... context menu for console and text editor as pdf.CTRL + Mouse wheel or CTRL + +/- to zoom in/out on console, editor, help.zoom , pan , rotate3d functions.MenuBar, ToolBar figure properties.feature builtin (undocument features, debug, tests, ...) content can change with next releases.GridAlpha, GridColor, View properties for Axes.checkupdate function and check update menu.isScalarStringArray iinternal API C++ method.saveas exports the figure as a PDF page with centered alignment.MarkerFaceColor value for compatibility.Nelson 1.0.0 has been released.
Nelson is an interactive, fully functional environment for engineering and scientific applications. It implements a matrix-driven language (which is largely compatible with MATLAB and GNU Octave), with advanced features such as 2-D 3-D plotting, image manipulation and viewing, a codeless interface to external C/C++/FORTRAN libraries, native support for various C types, and a host of other features.
Types managed by Nelson:
OpenMP and SIMD extensions used.
2D and 3D plotting with high-level plot commands.
Parallel Computing Module.
Fast Fourrier Transformation functions based on FFTW and MKL wrapper.
SLICOT (Subroutine Library in Systems and Control Theory) interfaces (optional).
Control System module.
Message Passing Interface (MPI): functions for parallel computing.
JSON decode/encode data support.
HDF5 high-level functions I/O,
HDF5 used as default data file format (.nh5) load/save workspace,
MAT-file compatible load/save workspace,
Foreign Function Interface C/Fortran.
Interfacing C/C++ or Fortran with Nelson (build and load external code on the fly).
MEX C API compatibility.
Nelson Engine API for C (compatible with MEX Engine). Call Nelson from your C code as engine.
RESTful API web service.
Inter-process communication between Nelson's process.
The QML engine enables nelson programs to display and manipulate graphical content using Qt's QML framework.
Component Object Model (COM) client interface: binary-interface standard for software components on Windows.
Write/Read xlsx files on Windows using COM.
Embedded Nelson code editor.
Help engine:
Generate help files using Nelson dedicated functions. View your generated help files as html, markdown, pdf, gitbook or directly in Nelson help viewer.
Tests engine:
Validate your algorithm using Nelson dedicated functions. Export the test results under the xUnit reports format.
Profiling and Code coverage tools for Nelson's language:
Nelson has a built-in profiler that is very useful to profile your code and find out what script or function is taking the most time.
Nelson cloud: Instant access to Nelson anywhere from an web browser.
Module skeleton to extend Nelson available here:
Nelson Modules Manager (nmm) : package manager for Nelson
quit, exit, startup.m, finish.m behavior reworked for compatibility.cellfun did not check type of second input argument.filter 1-D digital filter.
control system module (part 2):
freqresp Evaluate system response over a grid of frequencies.step Simulate continuous time model of a state space model or transfer function.lsim Plot simulated time response of dynamic system to arbitrary inputs.dc2 Convert model from discrete to continuous time.c2d Convert model from continuous to discrete time.augstate Append state vector to output vector.kalman Design Kalman filter for state estimation.evalfr Evaluate system response at specific frequency.nyquist Nyquist plot of frequency response.ord2 Generate continuous second-order systems.append Group models by appending their inputs and outputs.feedback Feedback connection of multiple models.parallel Parallel connection of two models.series Series connection of two models.ssdelete Remove inputs, outputs and states from state-space system.ssselect Extract subsystem from larger system.tzero Invariant zeros of linear system.tf2ss Convert transfer function filter parameters to state-space form.ss2tf Convert state-space representation to transfer function.minreal Minimal realization or pole-zero cancellation.ssdata Access state-space model data.tfdata Access transfer function data.gram Controllability and observability Gramians.hsvd Hankel singular values of a state-space or transfer function model.damp Natural frequency and damping ratio.balreal Gramian-based balancing of state-space realizations.lqry Form linear-quadratic (LQ) state-feedback regulator with output weighting.dlqr Linear-quadratic (LQ) state-feedback regulator for discrete-time state-space system.lqed Discrete Kalman estimator design from continuous cost function.lqe Kalman estimator design for continuous-time systems.lqr Linear-Quadratic Regulator (LQR) design.dare Solve discrete-time algebraic Riccati equations.care Continuous-time algebraic Riccati equation solution.ctrbf Compute controllability staircase form.ctrb Controllability of state-space model.obsv Observability matrix.obsvf Compute observability staircase form.acker Pole placement gain selection using Ackermann's formula.bdschur Block-diagonal Schur factorization.cloop Close unity feedback loops.compreal Companion realization of transfer functions.gensig Create periodic signals for simulating system response.hist Histogram plot.bar Bar graph.scatter Scatter plot.stem Plot discrete sequence data.stairs Stairstep graph.fill 2-D patch.pie legacy pie chart.subsref Subscripted reference.subsasgn Redefine subscripted assignment.substruct Create structure argument for subsasgn or subsref.deal Distribute inputs to outputs.hggroup.axes forces focus on current axe.patch and fill manages FaceAlpha.subsref, subsasgn compatibility with substruct.A = []; A(false) = zeros(3, 0) did not return an empty matrix but an error.private functions/folders support (to limit the scope of a function).
syntax extended to facilitate the creation of literal integers without loss of precision:
18446744073709551615u64, 18446744073709551615i64 (similar to rust syntax)flintmax('like', p) syntax added.
int64, uint64 warning about double-precision.
#570 balance: Diagonal scaling to improve eigenvalue accuracy.
isobject Check whether the input is an object.
cell2mat Convert cell array of matrices to single matrix.
#948 blkdiag Create a block diagonal matrix from 2D matrices of different sizes.
kron Kronecker tensor product.
strjust Justify strings.
control system module (part 1):
mag2db, db2mag, pow2db, db2pow functions.zp2tf: Zero-pole to transfer function conversion.dcgain: Low-frequency (DC) gain of LTI system.padecoef: Padé approximation of time delays.esort: Sort continuous-time poles by real part.dsort: Sort discrete-time poles by magnitude.lyap: Continuous Lyapunov equation solution.dlyap: Discret Lyapunov equation solution.abcdchk Verifies the dimensional compatibility of matrices A, B, C, and D.ss: State-space model.tf: Transfer function model (display, horzcat, vertcat, size).isct: checks if dynamic system model is in continuous time.isdt: checks if dynamic system model is in discret time.isstatic: checks if model is static or dynamic.islti: checks if variable is an linear model tf, ss or zpk.issiso: checks if dynamic system model is a single input and single output.zero: Zeros and gain of SISO dynamic system.pole: Poles of dynamic system.bode: Bode plot of frequency response, magnitude and phase data.xlabel on figure.#488 overloading functions:
.* operator optimized.
conv2 optimized.
Boost 1.82 used on Windows.
Internals:
class, function_handle types reworked.repmat, ones, NaN, Inf reworked.function_handle display is more compatible.
--withoutfilewatcher executable argument. disable file watcher for current session.<--FILE WATCHER REQUIRED --> test_run option.