fix webshot2 problem

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

New mods, vignette

• 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

commit 1fa9fd5285

Fix some minor bugs and update documentation

Added 5 vignettes; J() and LU()

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

Added regved3d for visualizing regression models

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

Adding vector diagram functions

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

Some small additions

matlib 0.5.2

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

Update with new functions

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 vignettes/linear-equations

Initial CRAN release

Initial version, now with two vignettes