scale_free {plothelper}

Scale values into a Certain Location

Description

A simple function to put numeric values into a certain interval. Suppose you have 20, 60, 80, 100, and you want them to be in the interval of [0, 1], so you can get 0, 0.5, 0.75, 1.

Usage

scale_free(
  x,
  left = 0,
  right = 1,
  reverse = FALSE,
  xmin = NULL,
  xmax = NULL,
  na.rm = FALSE
)

Arguments

x

a numeric vector or a numeric matrix, data frame, tibble object.

left

the smallest value of the the interval. If x has n columns, then left is expected to be of length n. However, if it is shorter, it will be repeated to reach that length.

right

the largest value of the the interval. If x has n columns, then right is expected to be of length n. However, if it is shorter, it will be repeated to reach that length.

reverse

whether to assign values in a reverse way. Default is FALSE. If x has n columns, then reverse is expected to be of length n. However, if it is shorter, it will be repeated to reach that length.

xmin

the min value. Default is NULL, which means use the min value of x. However, sometimes the min value of x may not be the true min value. Suppose the two scores of a 100-point test are 59, 87, then the true min score is 0 and the true max score is 100. Thus you must add xmin = 0, xmax = 100. If reverse = TRUE (that is, 0 is better than 100), also add xmin = 0, xmax = 100.

xmax

the same meaning as xmin, but for max value.

na.rm

used by min and max. Default is FALSE.

Examples

y=scale_free(c(-1, 0, 2))
y=scale_free(c(-1, 0, 2), rev=TRUE)
#
# x is a data frame.
x=data.frame(
	c(-1, 0, 0, 0, 2), c(-1, 0, 0, 0, 2), 
	c(-2, 0, 2, 4, 6), c(-2, 0, 2, 4, 6)
)
y=scale_free(x, 
	left=0, right=10, 
	reverse=c(FALSE, TRUE, FALSE, TRUE)
)
y=scale_free(x, 
	left=c(0, 0, 100, 100), right=c(10, 100, 200, 200), 
	reverse=c(FALSE, TRUE, FALSE, TRUE)
)