NEWS.md

In matlib: Matrix Functions for Teaching and Learning Linear Algebra and Multivariate Statistics

matlib 1.0.1

This is a moderate update, improving usability and documentation

• Rename vignettes to put them in order
• Add papers/matlib-useR-2016.pdf to avoid bad URL
• Consolidate options for print.latexMatrix
• Fix bug in print.latexMatrix(sparse=TRUE)
• plotEqn() gains a ... to pass other graphical parameters
• added coffee data (modified from spida2)
• Improve documentation of latexMatrix() and it's print() method to more clearly indicate how to set global options.

matlib 1.0.0

• added latexMatrix() to create a symbolic matrix
• latexMatrix() made more general to handle much wider variety of cases, with LaTeX output [JF]
• this is fleshed out with an Eqn() wrapper to work with other LaTeX-generating code in the package [PC]
• added a vignette, inv-3d illustrating linear transformations and matrix inverse in 3D using rgl
• latexMatrix() gets operators for matrix arithmetic (+,-, %*%) and operators (t())
• added vignette, latex-equations.Rmd illustrating the variety of functions in the package for constructing matrix equations in LaTeX
• added functions matmult(), matsum(), matpower() similar to the operators, but providing simplify = TRUE, as.numeric = TRUE
• Eqn() gains a preview argument, rendering a LaTeX matrix expression in a Viewer pane.
• latexMatrix() now allows row/column names to be displayed with a matrix.

matlib 0.9.8

• added circle() for drawing circles in diagrams
• vectors() now handles 0-length vectors more gracefully #50.
• matrix2latex() generalized to allow different bracket types and optionally show the size of the matrix.

matlib 0.9.7

• inv() and aliases now return invisible matrix when verbose = TRUE to match behaviour of related functions (e.g., gaussianElimination())
• GramSchmidt() gains an argument, omit_zero_columns to control whether all-zero columns are retained in the output (issue #48) [Thx: @ggrothendieck]
• Merge pull request #49 from JF to retain column names in GramSchmidt().

matlib 0.9.6

• fix some subtle problems related to the use of MASS::fractions() in various display functions, #42. (Thx: Phil Chalmers)
• Fix a problem with `showEqn(..., simplify=TRUE), #45. (Thx: John Fox)
• Remove Suggests: rglwidget as this is now in the rgl package (Thx: Duncan Murdoch); Merge pull request #39 from dmurdoch/norglwidget

matlib 0.9.5

• fix 'CRAN packages requiring webshot2 but not declaring it'
• fix error from Proj.Rd

matlib 0.9.4

• added xprod() for vector cross-product
• added data-beta vignette
• fix sprintf warning from LU [Phil Chalmers]
• better plotting of planes in plotEqn3d, alpha=0.9

matlib 0.9.3

• gaussianElimination() and friends now handle one-row or one-column matrices [suggestion of Jana Jarecki]
• improvements to plotEqn()

matlib 0.9.2

• Bug fix in arrows3d.r [Thx: Douglas Whitaker]
• Bump package version
• matlib gets a hex sticker
• Incorporated a numerical tolerance in GramSchmidt() [John Fox]
• Improved computation of SVD [John Fox]
• now export printMatrix()
• now export circle3d() [req: Marco Scazzocchio]
• now use_revdep()

matlib 0.9.1

• fix references to car datatsets -> carData

matlib 0.9.0

• showEqn() gains a reduced logical to print only the unique regression equations when a lm()-type object is passed. May be combined with the simplify logical argument for further reductions
• echelon() gains a reduced logical to indicate whether the reduced or non-reduced form is computed
• powerMethod() gains a plot = TRUE logical to draw the iteration history
• added support for 'lm' objects to showEqn() to show the design matrix equations
• added verbose option to GramSchmidt() and another example
• added printMatEqn() to print matrix expressions side-by-side
• prepare to release as a cumulative major version
• Phil Chalmers is now recognized officially as a package author [aut]

matlib 0.8.3

• rename functions for consistency: eig() -> Eigen(), point_on_line() -> pointOnLine(), power_method() -> powerMethod(), row_cofactors() -> rowCofactors(), row_minors() -> rowMinors().

• add Det() to compute determinants by elimination, from eigenvalues, or by minors and cofactors, with possibility of verbose output.

• plotEqn3d() gets an axes argument and lit to control lighting of the planes; lit solves a problem with the planes becoming indistinguishable in some rotations.
• add svdDemo() function to illustrate the SVD of a 3 x 3 matrix [thx: Duncan Murdoch]
• add symMat() to create a square symmetric matrix from a vector.
• add angle() to calculate angle between vectors
• powerMethod() gets a keep argument, for possible use in plotting the convergence of eigenvectors.
• add adjoint(), to round out methods for determinants
• add GramSchmidt() for the Gram-Schmidt algorithm on columns of a matrix. The existing function gsorth() will be deprecated and then removed.
• gsorth() has been deprecated.
• fixed use of MASS::fractions in gaussianElimination
• added printMatEqn() to print matrix expressions side-by-side

matlib 0.8.1

• remove inst/doc to satisfy CRAN

matlib 0.8.0

• add a vignette on properties of determinants (det-ex1)
• add a vignette on evaluation of determinants (det-ex2)
• add vignette on matrix inverse (inv-ex1)
• now use travis-ci to check builds
• add vignette on matrix inverse using EROs (inv-ex2)
• extended use of geometric diagrams in vignettes
• add vignette on generalized inverse (ginv)
• added J() for unit vectors, matrices
• added LU() for LU decomposition

matlib 0.7.3

• Changed gaussianElimination() by defining local ERO functions to make the algorithm clearer; in verbose mode, show each ERO.
• Added a draw argument to vectors3d() and arrows3d(), which defaults to TRUE. If FALSE, just returns returns the "reg.length" to help in scaling.
• Optionally scale error spheres (and circles) produced by regvec3d() so that they project confidence intervals on the x1 and x2 axes.
• Small cosmetic changes to regvec3d().
• showEqn() and gaussianElimination() get latex arguments, to print results in LaTeX format [thx: Phil Chalmers]

matlib 0.7.2

• added argument error.sphere to plot.regvec3d() [JF]
• remove use of lengths() in corner() to avoid R version dependency

matlib 0.7.0

• use corner() in vectors3d.Rd
• added arc() for 2D, 3D vector diagrams to show angles between vectors
• added regvec3d() for 2D, 3D vector diagrams representing a bivariate multiple regression model, lm(y ~ x1 + x2) [thx: John Fox]
• added internal .arrows() to produce nice arrows in 2D vector() diagrams
• fixed numerous small problems in vector diagrams
• fixed some erroneous statements in vignettes
• showEqn() now aligns terms vertically and prints without quotes
• reversed sense of absolute in points_on_line() and clarified documentation

matlib 0.6.0

• added vandermode() function
• added vec() convenience function to vectorize a matrix
• added is_square_matrix() tests
• added power_method(), power method for dominant eigenvector [thx: Gaston Sanchez]
• added arrows3d() for 3D geometric diagrams
• added vectors3d() for 3D geometric diagrams
• added corner() for 2D, 3D geometric diagrams
• added more documentation content to man/matlib.Rd from README.md

matlib 0.5.2

• added swp() function
• added vignette("gramreg") - Gram-Schmidt Orthogonalization and Regression

matlib 0.5.1

• added len() convenience function for Euclidean lengths
• added plotEqn3d() function using rgl to plot equations in 3 unknowns
• reorganized matlib.R to become a package .Rd document
• renamed proj() -> Proj() to avoid conflict with stats::proj()
• added vectors() for plotting geometric diagrams
• added vignette("linear-equations") - Solving Linear Equations

matlib 0.4.1

Initial CRAN release

matlib documentation built on Nov. 5, 2025, 6:24 p.m.