I've been thinking hard about generating colour schemes for data.
There's quite a bit of existing code scattered in various packages for
playing with colours and colour palettes, but I can't find the sort of
thing I'm after for applying colours to data...
To my mind a colour scheme is a
On Thu, May 21, 2009 at 2:18 PM, richard.cot...@hsl.gov.uk wrote:
Most of the plots where colour is typically used to signify a variable
already do map colours to data values. Take a look at help pages for
levelplot/contourplot/wireframe from the lattice package, and image from
base
I'm going to take your second example first.
The base graphics image function has zlim arguments which let you do:
z=outer(1:10,1:10,*)
image(z)
image(z/2, zlim=range(z))
but again, not obvious, and complex/impossible when using more
sophisticated colour mappings.
The way to do
Yes, but these things are all at the wrong conceptual level. What you
are constructing here is a function that maps value to colour, but
keeping it as breaks and cut values and colours instead of
representing it as a function. Wouldn't it be nicer to build a real
function object and have
On Thu, May 21, 2009 at 10:53 AM, Barry Rowlingson
b.rowling...@lancaster.ac.uk wrote:
On Thu, May 21, 2009 at 5:29 PM, Deepayan Sarkar
deepayan.sar...@gmail.com wrote:
[oops I didnt reply-to-all]
But you could specify an explicit 'at' vector specifying the color
breakpoints: effectively,
