logSpaced: Logarithmically spaced points

In berryFunctions: Function Collection Related to Plotting and Hydrology

Logarithmically spaced points

Description

Calculates values that are in logarithmic distance from each other e.g. to produce logarithmic interval borders.
For exact logarithmic spacing, use 10^seq(from=log10(1), to=log10(100), len=100)

Usage

logSpaced(
  base = 1.1708,
  n = 20,
  min = 1,
  max = n,
  plot = TRUE,
  pch = 3,
  las = 1,
  ylab = "base",
  ...
)

Arguments

base	Base for calculations, can be a vector to compare several bases. DEFAULT: 1.1708
n	Number of values to be calculated. DEFAULT: 30
min, max	Range where n values are to be distributed, single values each. DEFAULT: 1,n
plot	Should the points be plotted on a line? DEFAULT: TRUE
pch, las	PointCharacter and Label Axis Style. DEFAULT: 3,1
ylab	Y axis label. DEFAULT: "base"
...	Further arguments passed to plot

Value

Vector or matrix, depending on base input

Note

base >1 concentrates points at low values, base<1 at high values. base does not relate to base in log!

Author(s)

Berry Boessenkool, [e-mail], Oct 2014

See Also

classify, log, https://stackoverflow.com/a/29963530

Examples

logSpaced()
logSpaced(base=c(1.1, 1.5, 2), n=6, min=5, max=10)
d <- logSpaced(seq(0.8, 1.2, 0.025), main="logarithmically spaced points")

# the default base for the default n (20) will give an approximately equal
# bin width across the range on a logarithmic scale:
d <- logSpaced()
plot(d, rep(1,20), log="x")

# For exactly spacing logarithmically, use
plot(10^seq(from=log10(1), to=log10(100), len=100), log="y")

berryFunctions documentation built on May 29, 2024, 4:01 a.m.