# nelson | The Nelson Programming Language | Knowledge Base | Instagit

The Nelson Programming Language

GitHub Stars: 122

Repository: https://github.com/nelson-lang/nelson

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## Articles

### [How to Configure and Use FFT Functions with FFTW and MKL Backends in Nelson](/nelson-lang/nelson/how-do-i-configure-and-use-fft-functions-with-fftw-and-mkl-backends)

Learn to configure and use FFT functions in Nelson with FFTW and MKL backends. Nelson automatically selects the optimal library for high performance.

- Tags: how-to-guide
- Published: 2026-03-08

### [How to Work with JSON Data Using Nelson's json Module: A Complete Guide](/nelson-lang/nelson/how-do-i-work-with-json-data-using-nelsons-json-module)

Master Nelson's json module to serialize variables with jsonencode and parse JSON strings or files using jsondecode. Format output with jsonprettyprint. A complete guide for Nelson developers.

- Tags: tutorial
- Published: 2026-03-08

### [How to Use MEX API Compatibility for Porting MATLAB Code to Nelson](/nelson-lang/nelson/how-do-i-use-mex-api-compatibility-for-porting-matlab-code)

Effortlessly port MATLAB code to Nelson using the MEX C API Compatibility layer. Compile and run existing MATLAB MEX-files without source code changes.

- Tags: how-to-guide
- Published: 2026-03-08

### [How to Write and Run Tests Using the tests_manager with xUnit Export in Nelson](/nelson-lang/nelson/how-do-i-write-and-run-tests-using-the-tests-manager-with-xunit-export)

Learn to write and run tests using Nelson's tests_manager with xUnit export. Execute test suites and export results for CI integration using the test_run function.

- Tags: how-to-guide
- Published: 2026-03-08

### [Nelson Engine Modes: CLI vs GUI vs Embedded Differences Explained](/nelson-lang/nelson/what-is-the-difference-between-nelson-engine-modes-cli-vs-gui-vs-embedded)

Understand Nelson engine modes: CLI, GUI, and embedded. Learn how each mode functions as a terminal app, an IDE, or integrates UI components into your sessions.

- Tags: deep-dive
- Published: 2026-03-08

### [How Memory Management Works in Nelson: Architecture and Best Practices](/nelson-lang/nelson/how-does-memory-management-work-in-nelson-and-what-are-best-practices)

Explore Nelson's deterministic reference counting and copy-on-write memory management. Learn how variables and Data blocks work to automatically free memory. Optimize your Nelson code.

- Tags: internals
- Published: 2026-03-08

### [How to Create Graphical User Interfaces Using the GUI Module Controls in Nelson](/nelson-lang/nelson/how-do-i-create-graphical-user-interfaces-using-the-gui-module-controls)

Learn to build interactive applications with Nelson's GUI module. Easily create graphical user interfaces using msgbox, warndlg, questdlg, uigetfile, and uicontrol.

- Tags: how-to-guide
- Published: 2026-03-08

### [How to Use Nelson's Web Tools for RESTful API Interactions: A Complete Guide](/nelson-lang/nelson/how-do-i-use-nelsons-web-tools-for-restful-api-interactions)

Learn to use Nelson's web tools for RESTful API interactions. Explore webread, webwrite, weboptions, and websave to easily handle HTTP requests and JSON responses in MATLAB.

- Tags: how-to-guide
- Published: 2026-03-08

### [How the Nelson Type Overload System Implements Custom Behaviors: A Complete Guide](/nelson-lang/nelson/how-does-the-type-overload-system-work-for-implementing-custom-behaviors)

Discover how the Nelson type overload system maps function calls to custom M-files at runtime. Learn to implement specialized behaviors efficiently with this comprehensive guide.

- Tags: deep-dive
- Published: 2026-03-08

### [How to Handle Errors and Use the error_manager Module in Nelson](/nelson-lang/nelson/how-do-i-handle-errors-and-use-the-error-manager-module-in-nelson)

Master error handling in Nelson with error_manager. Learn to bridge C++ exceptions and script functions like error warning and throw for robust code. Discover how.

- Tags: how-to-guide
- Published: 2026-03-08

### [How Sparse Matrices Work in Nelson: Architecture, Construction, and Operations](/nelson-lang/nelson/how-do-sparse-matrices-work-in-nelson-and-what-operations-are-supported)

Explore how Nelson uses Eigen to implement sparse matrices for efficient data handling. Learn about supported construction, arithmetic and conversion operations.

- Tags: architecture
- Published: 2026-03-08

### [How to Use the onCleanup Mechanism in Nelson for Reliable Resource Management](/nelson-lang/nelson/how-do-i-use-the-oncleanup-mechanism-for-proper-resource-management-and-cleanup)

Learn how to use the onCleanup mechanism in nelson-lang/nelson to automatically release resources like file handles even during errors. Ensure reliable resource management.

- Tags: how-to-guide
- Published: 2026-03-08

### [Nelson Engine API: How to Embed Nelson as a Computational Backend in C Applications](/nelson-lang/nelson/what-is-the-nelson-engine-api-and-how-do-i-embed-nelson-as-a-backend-in-c-applications)

Discover the Nelson Engine API to embed Nelson as a computational backend in C applications. Start Nelson processes, evaluate commands, and exchange data via shared memory IPC.

- Tags: how-to-guide
- Published: 2026-03-08

### [How Nelson's Foreign Function Interface (FFI) Loads C and Fortran Code](/nelson-lang/nelson/how-does-the-foreign-function-interface-ffi-work-for-loading-c-fortran-code)

Discover how Nelson's FFI loads C/Fortran code. Learn about dynamic linking runtime symbol resolution and automatic data marshalling for seamless native integration.

- Tags: deep-dive
- Published: 2026-03-08

### [How to Read and Write HDF5 Files in Nelson: Complete Guide to .nh5 Workspace Format](/nelson-lang/nelson/how-do-i-read-write-hdf5-files-in-nelson-nh5-workspace-format)

Learn to read and write HDF5 files in Nelson using load and save functions. Explore the .nh5 workspace format and HDFS integration. Get direct access to your data.

- Tags: how-to-guide
- Published: 2026-03-08

### [How to Use the Profiler to Analyze and Optimize Nelson Code Performance](/nelson-lang/nelson/how-do-i-use-the-profiler-to-analyze-and-optimize-nelson-code-performance)

Optimize Nelson code performance using the profiler. Learn how to profile code, view statistics, and identify bottlenecks with simple commands.

- Tags: performance
- Published: 2026-03-08

### [How to Create Custom Built-in Functions in Nelson Using the C++ Gateway API](/nelson-lang/nelson/how-do-i-create-custom-built-in-functions-in-nelson-using-the-c-plus-plus-gateway-api)

Learn to create custom built-in functions in Nelson using the C++ Gateway API. Implement C++ functions and register them to extend Nelson's capabilities.

- Tags: how-to-guide
- Published: 2026-03-08

### [How the Parallel Module Works for Multi-Threaded Computations in Nelson](/nelson-lang/nelson/how-does-the-parallel-module-work-for-multi-threaded-computations-in-nelson)

Explore Nelson's parallel module for multi-threaded computations. Learn how its C++17 thread pool and Future objects enable asynchronous execution with MATLAB-compatible parfeval syntax.

- Tags: internals
- Published: 2026-03-08

### [How to Use MPI for Distributed Parallel Computing in Nelson: A Complete Guide](/nelson-lang/nelson/how-do-i-use-mpi-for-distributed-parallel-computing-in-nelson)

Learn to use MPI for distributed parallel computing in Nelson. This guide covers the native MPI module and high-level functions for efficient parallel scripting.

- Tags: tutorial
- Published: 2026-03-08

### [How to Integrate Julia Code in Nelson Using the julia_engine Module](/nelson-lang/nelson/how-do-i-integrate-julia-code-in-nelson-using-the-julia-engine-module)

Integrate Julia code in Nelson using julia_engine. Execute Julia expressions and scripts with jlrun and jlrunfile, passing and retrieving data seamlessly. 

- Tags: how-to-guide
- Published: 2026-03-08

### [How to Integrate Python Code in Nelson Using the python_engine Module](/nelson-lang/nelson/how-do-i-integrate-python-code-in-nelson-using-the-python-engine-module)

Seamlessly integrate Python code in Nelson with the python_engine module. Discover how to use pyrun and py_invoke for dynamic Python execution. Learn more.

- Tags: how-to-guide
- Published: 2026-03-08

### [How to Use the Nelson Debugger to Set Breakpoints and Inspect Variables](/nelson-lang/nelson/how-do-i-use-the-nelson-debugger-to-set-breakpoints-and-inspect-variables)

Master the Nelson debugger to set breakpoints and inspect variables. Learn MATLAB-style commands for command line or Qt editor debugging.

- Tags: how-to-guide
- Published: 2026-03-08

### [How Does the Nelson Interpreter Parse and Execute Code Internally](/nelson-lang/nelson/how-does-the-nelson-interpreter-parse-and-execute-code-internally)

Discover how the Nelson interpreter parses and executes code internally. Explore its lex-parse-evaluate pipeline, tokenization, AST construction, and tree-walking execution.

- Tags: internals
- Published: 2026-03-08

### [How Nelson's Module System Works and How to Create a Custom Module](/nelson-lang/nelson/how-does-nelsons-module-system-work-and-how-do-i-create-a-custom-module)

Discover how Nelson's module system uses ModulesManager and simple scripts like loader.m to manage functionality. Learn to create your own custom module easily.

- Tags: deep-dive
- Published: 2026-03-08