mathworld.wolfram.com
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MathWorld is a comprehensive online mathematics encyclopedia by Wolfram offering detailed articles on math topics. It includes definitions, explanations, formulas, examples, and diagrams, with content on linear algebra and sparse matrices.
More resources on Sparse Matrices
SciPy Sparse Matrices Documentation
Practical guide for Python users
SPARSKIT
Collection of sparse matrix routines by Yousef Saad, free download
SuiteSparse
Comprehensive suite of sparse matrix algorithms by Timothy Davis, free software and docs
Applied Numerical Linear Algebra
Learn applied numerical linear algebra, focusing on sparse matrices, with Prof. Gunnels. Explore key concepts and practical applications!
ocw.mit.edu
MIT OpenCourseWare (OCW) provides free, openly accessible course materials from MIT across a wide range of subjects. It includes lecture notes, assignments, exams, and other course content, with many courses offering video lectures for self-guided study.
nptel.ac.in
NPTEL is an Indian online-learning platform offering free video courses and lecture materials from IITs and IISc across engineering and sciences. It provides course videos, notes, assignments, and exams, including content on linear algebra and numerical methods where sparse matrices are covered.