lsumprod {exams.forge}

Supporting Functions for Math LaTeX Output

Description

lsumprod creates a latex printout of \sum_i x_i y_i with brackets if x_i or y_i starts with a -.

lsum creates a latex printout of x as sum.

lprod creates a latex printout of x as product.

lvec creates a latex printout of x as vector.

lmean creates a latex printout as \frac{x_1+...+x_n}{n}.

lvar creates a latex printout as \frac{(x_1-xbar)^2+...+(x_n-xbar)^2}{n}.

lbr creates a latex printout of x with brackets if x starts with a -.

lsgn creates a latex printout of x with a plus or minus at the beginning.

Usage

lsumprod(..., br = "(")

lsum(x)

lprod(x)

lvec(
  x,
  left = c("(", "[", "{", "|", "||", "<", "a", "c", "f"),
  right = NULL,
  collapse = ", "
)

lmean(x)

lvar(x, mu = NULL, br = "(")

lbr(x, br = c("(", "[", "{", "|", "||", "<", "a", "c", "f"), subset = NULL)

lsgn(x)

latex_sumprod(..., br = "(")

latex_sum(x)

latex_product(x)

latex_mean(x)

latex_var(x, mu = NULL, br = "(")

latex_bracket(
  x,
  br = c("(", "[", "{", "|", "||", "<", "a", "c", "f"),
  subset = NULL
)

latex_pmsign(x)

Arguments

...

further input values

br, left, right

character: which brackets to use. The possibilities are:

• ( (default) uses ⁠\left(⁠ and ⁠\right(⁠,

• [ use ⁠\left[⁠ and ⁠\right]⁠,

• { use ⁠\left\{⁠ and ⁠\right\}⁠,

• | use ⁠\left|⁠ and ⁠\right|⁠,

• || uses ⁠\left\|⁠ and ⁠\right\|⁠,

• <, a use ⁠\left\langle⁠ and ⁠\right\rangle⁠,

• c use ⁠\left\lceil⁠ and ⁠\right\rceil⁠, and

• f use ⁠\left\lfloor⁠ and ⁠\right\rfloor⁠.

x

numeric: input values

collapse

character: an optional character string to separate the results (default: ', ')

mu

numeric: population mean (default: NULL)

subset

logical: indicates which elements have brackets added (default: NULL = all elements starting with -); missing values are taken as false.

Value

A character.

Examples

lsumprod(-2:2, (1:5)/10)
lbr(-2:2)
lsum(-2:2)
lmean(-2:2)
lvec(-2:2)
lvec(-2:2, '[')
lvec(0:1, '(', ']')