rescale: Rescale values to lie in a given range

Description Usage Arguments Value Author(s) Examples

Description

This is helpful in e.g. developing a colour scale for an image plot. It is not necessary that `rlow` be less than `rhigh`, and in fact reversing them is a good way to get a reversed colour scale for a plot.

Usage

 `1` ```rescale(x, xlow, xhigh, rlow = 0, rhigh = 1, clip = TRUE) ```

Arguments

 `x` a numeric vector. `xlow` `x` value to correspond to `rlow`. If not given, it will be calculated as the minimum value of `x` `xhigh` `x` value to correspond to `rhigh`. If not given, it will be calculated as the maximum value of `x` `rlow` value of the result corresponding to `x` equal to `xlow`. `rhigh` value of the result corresponding to `x` equal to `xhigh`. `clip` logical, set to `TRUE` to clip the result to the range spanned by `rlow` and `rhigh`.

Value

A new vector, which has minimum `lim[1]` and maximum `lim[2]`.

Dan Kelley

Examples

 ``` 1 2 3 4 5 6 7 8 9 10 11``` ```library(oce) # Fake tow-yow data t <- seq(0, 600, 5) x <- 0.5 * t z <- 50 * (-1 + sin(2 * pi * t / 360)) T <- 5 + 10 * exp(z / 100) palette <- oce.colorsJet(100) zlim <- range(T) drawPalette(zlim=zlim, col=palette) plot(x, z, type='p', pch=20, cex=3, col=palette[rescale(T, xlow=zlim[1], xhigh=zlim[2], rlow=1, rhigh=100)]) ```

Search within the oce package
Search all R packages, documentation and source code

Questions? Problems? Suggestions? or email at ian@mutexlabs.com.

Please suggest features or report bugs with the GitHub issue tracker.

All documentation is copyright its authors; we didn't write any of that.