# printMatEqn

From matlib v0.9.2
by Michael Friendly

##### Print Matrices or Matrix Operations Side by Side

This function is designed to print a collection of matrices, vectors, character strings and matrix expressions side by side. A typical use is to illustrate matrix equations in a compact and comprehensible way.

##### Usage

```
printMatEqn(..., space = 1, tol = sqrt(.Machine$double.eps),
fractions = FALSE)
```

##### Arguments

- ...
matrices and character operations to be passed and printed to the console. These can include named arguments, character string operation symbols (e.g.,

`"+"`

)- space
amount of blank spaces to place around operations such as

`"+"`

,`"-"`

,`"="`

, etc- tol
tolerance for rounding

- fractions
logical; if

`TRUE`

, try to express non-integers as rational numbers

##### Value

NULL; A formatted sequence of matrices and matrix operations is printed to the console

##### See Also

##### Examples

```
# NOT RUN {
A <- matrix(c(2, 1, -1,
-3, -1, 2,
-2, 1, 2), 3, 3, byrow=TRUE)
x <- c(2, 3, -1)
# provide implicit or explicit labels
printMatEqn(AA = A, "*", xx = x, '=', b = A %*% x)
printMatEqn(A, "*", x, '=', b = A %*% x)
printMatEqn(A, "*", x, '=', A %*% x)
# compare with showEqn
b <- c(4, 2, 1)
printMatEqn(A, x=paste0("x", 1:3),"=", b)
showEqn(A, b)
# decimal example
A <- matrix(c(0.5, 1, 3, 0.75, 2.8, 4), nrow = 2)
x <- c(0.5, 3.7, 2.3)
y <- c(0.7, -1.2)
b <- A %*% x - y
printMatEqn(A, "*", x, "-", y, "=", b)
printMatEqn(A, "*", x, "-", y, "=", b, fractions=TRUE)
# }
```

*Documentation reproduced from package matlib, version 0.9.2, License: GPL (>= 2)*

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