plotEqn | R Documentation |
Shows what matrices A, b look like as the system of linear equations, A x = b with two unknowns, x1, x2, by plotting a line for each equation.
plotEqn( A, b, vars, xlim, ylim, col = 1:nrow(A), lwd = 2, lty = 1, axes = TRUE, labels = TRUE, solution = TRUE )
A |
either the matrix of coefficients of a system of linear equations, or the matrix |
b |
if supplied, the vector of constants on the right hand side of the equations, of length matching
the number of rows of |
vars |
a numeric or character vector of names of the variables.
If supplied, the length must be equal to the number of unknowns in the equations, i.e., 2.
The default is |
xlim |
horizontal axis limits for the first variable |
ylim |
vertical axis limits for the second variable; if missing, |
col |
scalar or vector of colors for the lines, recycled as necessary |
lwd |
scalar or vector of line widths for the lines, recycled as necessary |
lty |
scalar or vector of line types for the lines, recycled as necessary |
axes |
logical; draw horizontal and vertical axes through (0,0)? |
labels |
logical, or a vector of character labels for the equations; if |
solution |
logical; should the solution points for pairs of equations be marked? |
nothing; used for the side effect of making a plot
Michael Friendly
Fox, J. and Friendly, M. (2016). "Visualizing Simultaneous Linear Equations, Geometric Vectors, and Least-Squares Regression with the matlib Package for R". useR Conference, Stanford, CA, June 27 - June 30, 2016.
showEqn
# consistent equations A<- matrix(c(1,2,3, -1, 2, 1),3,2) b <- c(2,1,3) showEqn(A, b) plotEqn(A,b) # inconsistent equations b <- c(2,1,6) showEqn(A, b) plotEqn(A,b)
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