NuMojo

NuMojo is a library for numerical computing in Mojo 🔥 similar to NumPy, SciPy in Python.

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Table of Contents

1. About The Project
2. Goals
3. Usage
4. How to install
5. Contributing
6. Warnings
7. License
8. Acknowledgements
9. Contributors

About the project

NuMojo aims to encompass the extensive numerics capabilities found in Python packages such as NumPy, SciPy, and Scikit-learn. What NuMojo is

We seek to harness the full potential of Mojo, including vectorization, parallelization, and GPU acceleration. Currently, NuMojo extends most (if not all) standard library math functions to support array inputs.

Our vision for NuMojo is to serve as an essential building block for other Mojo packages needing fast math operations, without the additional weight of a machine learning back-propagation system.

What NuMojo is not

NuMojo is not a machine learning library and will never include back-propagation as part of the base library.

Features and goals

Our primary objective is to develop a fast, comprehensive numerics library in Mojo. Below are some features and long-term goals. Some have already been implemented (fully or partially).

Core data types:

• Native n-dimensional array (numojo.NDArray).
• Native 2-dimensional array, i.e., matrix (numojo.Matrix).
• Native n-dimensional complex array (numojo.ComplexNDArray)
• Native fixed-dimension array (to be implemented when trait parameterization is available).

Routines and objects:

• Array creation routines (numojo.creation)
• Array manipulation routines (numojo.manipulation)
• Input and output (numojo.io)
• Linear algebra (numojo.linalg)
• Logic functions (numojo.logic)
• Mathematical functions (numojo.math)
• Exponents and logarithms (numojo.exponents)
• Extrema finding (numojo.extrema)
• Rounding (numojo.rounding)
• Trigonometric functions (numojo.trig)
• Random sampling (numojo.random)
• Sorting and searching (numojo.sorting, numojo.searching)
• Statistics (numojo.statistics)
• etc...

Please find all the available functions and objects here. A living roadmap is maintained in docs/user-guide/roadmap.md.

For a detailed roadmap, please refer to the docs/user-guide/roadmap.md file.

Usage

Runnable examples are available in examples/ (e.g., examples/quickstart.mojo).

An example of n-dimensional array (NDArray type) goes as follows.

import numojo as nm
from numojo.prelude import *


def main() raises:
    # Generate two 1000x1000 matrices with random float64 values
    var A = nm.random.randn(Shape(1000, 1000)) # Shape is used for all shape related operations in numojo. 
    var B = nm.random.randn(Shape(1000, 1000))

    # Generate a 3x2 matrix from string representation
    var X = nm.fromstring[f32]("[[1.1, -0.32, 1], [0.1, -3, 2.124]]")

    # Print array
    print(A)

    # Array multiplication
    var C = A @ B

    # Array inversion
    var I = nm.inv(A)

    # Array slicing
    var A_slice = A[1:3, 4:19]

    # Get scalar from array
    var A_item = A[Item(291, 141)] # Item() is used to define coordinates of an ndarray in numojo. 
    var A_item_2 = A.item(291, 141)

An example of matrix (Matrix type) goes as follows.

from numojo import Matrix
from numojo.prelude import *


def main() raises:
    # Generate two 1000x1000 matrices with random float64 values
    var A = Matrix.rand(shape=(1000, 1000))
    var B = Matrix.rand(shape=(1000, 1000))

    # Generate 1000x1 matrix (column vector) with random float64 values
    var C = Matrix.rand(shape=(1000, 1))

    # Generate a 4x3 matrix from string representation
    var F = Matrix.fromstring[i8](
        "[[12,11,10],[9,8,7],[6,5,4],[3,2,1]]", shape=(4, 3)
    )

    # Matrix slicing
    var A_slice = A[1:3, 4:19] # returns a copy, for getting a view use `A.get(Slice(1,3), Slice(4, 19))
    var B_slice = B[255, 103:241:2]

    # Get scalar from matrix
    var A_item = A[291, 141]

    # Flip the column vector
    print(C[::-1, :])

    # Sort and argsort along axis
    print(nm.sort(A, axis=1))
    print(nm.argsort(A, axis=0))

    # Sum the matrix
    print(nm.sum(B))
    print(nm.sum(B, axis=1))

    # Matrix multiplication
    print(A @ B)

    # Matrix inversion
    print(A.inv())

    # Solve linear algebra
    print(nm.solve(A, B))

    # Least square
    print(nm.lstsq(A, C))

An example of ComplexNDArray is as follows:

import numojo as nm
from numojo.prelude import *


def main() raises:
    # Create a complex scalar 5 + 5j
    # cf32 is the complex version of f32 (DType.float32) used to identify complex types in numojo.
    var complexscalar = CScalar[cf32](5) # Equivalently ComplexSIMD[cf32](5, 5)
    # Also can be define as simple as  5 + 5*`1j`!
  
    # Create complex arrays
    var A = nm.full[cf32](Shape(1000, 1000), fill_value=complexscalar)  # filled with (5+5j)
    var B = nm.ones[cf32](Shape(1000, 1000))                            # filled with (1+1j)

    # Print array
    print(A)

    # Array slicing
    var A_slice = A[1:3, 4:19]

    # Array multiplication
    var C = A * B

    # Get scalar from array
    var A_item = A[Item(291, 141)]
    # Set an element of the array
    A[item(291, 141)] = complexscalar

Installation

NuMojo offers several installation methods to suit different development needs. Choose the method that best fits your workflow:

Method 1: Git Installation with pixi-build-mojo (Recommended)

Install NuMojo directly from the GitHub repository to access both stable releases and cutting-edge features. This method is perfect for developers who want the latest functionality or need to work with the most recent stable version.

Add the following to your existing pixi.toml:

[workspace]
preview = ["pixi-build"]

[package]
name = "your_project_name"
version = "0.1.0"

[package.build]
backend = {name = "pixi-build-mojo", version = "0.*"}

[package.build.config.pkg]
name = "your_package_name"

[package.host-dependencies]
modular = ">=25.7.0,<26"

[package.build-dependencies]
modular = ">=25.7.0,<26"
numojo = { git = "https://github.com/Mojo-Numerics-and-Algorithms-group/NuMojo", branch = "main"}

[package.run-dependencies]
modular = ">=25.7.0,<26"
numojo = { git = "https://github.com/Mojo-Numerics-and-Algorithms-group/NuMojo", branch = "main"}

[dependencies]
modular = ">=25.7.0,<26"
numojo = { git = "https://github.com/Mojo-Numerics-and-Algorithms-group/NuMojo", branch = "main"}

Then run:

pixi install

Branch Selection:

• main branch: Provides stable release. Currently supports NuMojo v0.8.0, compatible with Mojo 25.6.0. For earlier NuMojo versions, use Method 2.
• pre-x.y branches: Active development branch supporting the latest Mojo version (currently mojo nightly 26.2.0.dev2026022717). Note that this branch receives frequent updates and may have breaking changes in features and syntax.

The package will be automatically available in your Pixi environment, and VSCode LSP will provide intelligent code hints.

Method 2: Stable Release via Pixi (prefix.dev)

For most users, we recommend installing a stable release through Pixi for guaranteed compatibility and reproducibility.

Add the following to your pixi.toml file:

[workspace]
channels = ["https://repo.prefix.dev/modular-community"]

[dependencies]
numojo = "=0.9.0"

Then run:

pixi install

Version Compatibility:

NuMojo Version	Required Mojo Version
v0.9.0	==26.2
v0.8.0	==25.7
v0.7.0	==25.3
v0.6.1	==25.2
v0.6.0	==25.2

Method 3: Build Standalone Package

This method creates a portable numojo.mojopkg file that you can use across multiple projects, perfect for offline development or hermetic builds.

1. Clone the repository:

   git clone https://github.com/Mojo-Numerics-and-Algorithms-group/NuMojo.git
   cd NuMojo

2. Build the package:

   pixi run package

3. Copy numojo.mojopkg to your project directory or add its parent directory to your include paths.

Method 4: Direct Source Integration

For maximum flexibility and the ability to modify NuMojo source code during development:

1. Clone the repository to your desired location:

   git clone https://github.com/Mojo-Numerics-and-Algorithms-group/NuMojo.git

2. When compiling your code, include the NuMojo source path:

   mojo run -I "/path/to/NuMojo" your_program.mojo

3. VSCode LSP Setup (for code hints and autocompletion):

   • Open VSCode preferences
   • Navigate to Mojo › Lsp: Include Dirs
   • Click Add Item and enter the full path to your NuMojo directory (e.g., /Users/YourName/Projects/NuMojo)
   • Restart the Mojo LSP server

After setup, VSCode will provide intelligent code completion and hints for NuMojo functions!

Contributing

Any contributions you make are greatly appreciated. See CONTRIBUTING.md for guidelines (coding style, testing, documentation, release cadence).

Warnings

This library is still early and may introduce breaking changes between minor versions. Pin versions in production or research code.

License

Distributed under the Apache 2.0 License with LLVM Exceptions. See LICENSE and the LLVM License for more information.

This project includes code from Mojo Standard Library, licensed under the Apache License v2.0 with LLVM Exceptions (see the LLVM License). MAX and Mojo usage and distribution are licensed under the MAX & Mojo Community License.

Acknowledgements

Built in native Mojo which was created by Modular.

Contributors