Displaying 7 results from an estimated 7 matches for "rrggbbaa".
2004 Oct 07
3
How to use alpha transparency channel for colors?
The release notes for R 2.0.0 states:
It is now possible to specify colours with a full alpha
transparency channel via the new 'alpha' argument to the
rgb() and hsv() functions, or as a string of the form "#RRGGBBAA".
NOTE: most devices draw nothing if a colour is not opaque,
but PDF and Quartz devices will render semitransparent colours.
A new argument 'alpha' to the function col2rgb()
provides the ability to return the alpha component of
colours (as well as the red, green, and blue c...
2013 Jun 07
1
col2rgb, factors & documentation
...er value of the first level
# and this is res[,1] which by the way is palette()[5], aka "cyan"
?col2rgb says:
col
vector of any of the three kinds of R color specifications, i.e., either a color name (as listed by colors()), a hexadecimal string of the form "#rrggbb" or "#rrggbbaa" (see rgb), or a positive integer i meaning palette()[i]. Non-numeric values are coerced to character.
So in the example the factor is being taken as its integer representation, and finding an integer as the input value, col2rgb goes to palette().
Perhaps this is a nuance that belongs in the...
2023 Jan 12
2
Background for word
Dear,
I am having a lucky day. I am programming in RStudio and when I type
"black" (quotation signs included, the word turn into a word with black
ground. Couldn't get rid of the background----copying to Word, Excel,
text editor and paste back to Rstudio, the word is still in black
background? Help!
??? dv.group<-c("black","othrrace");
2007 Oct 10
3
transparent colors
Dear R graphics experts,
Do you know of any way of plotting semi-transparent points in R ?
I face this problem any time I want to e.g. plot thousands of points
that belong to two or three classes which I color code.
With the default opaque colors, the plotting order matters and
basically the points I plot last completely dominate the picture. I
would much rather have the overlaying points
2004 Oct 13
3
Maps and plotting
At our facility we have multiple sample points that are sampled on any
given day. What I would like to do is create a map of the facility with
the sample points (and point labels) and when we have out of
specification results, place a transparent dot over the area on the map.
As the number of OOS results builds up, I envision the dot getting
darker.
Are there any packages out there that can aid
2004 Oct 04
7
R 2.0.0 is released
......Get from variable) issues a similar warning.
o reshape() can handle multiple 'id' variables.
o It is now possible to specify colours with a full alpha
transparency channel via the new 'alpha' argument to the
rgb() and hsv() functions, or as a string of the form "#RRGGBBAA".
NOTE: most devices draw nothing if a colour is not opaque,
but PDF and Quartz devices will render semitransparent colours.
A new argument 'alpha' to the function col2rgb()
provides the ability to return the alpha component of
colours (as well as the red, green, and blue compon...
2004 Oct 04
7
R 2.0.0 is released
......Get from variable) issues a similar warning.
o reshape() can handle multiple 'id' variables.
o It is now possible to specify colours with a full alpha
transparency channel via the new 'alpha' argument to the
rgb() and hsv() functions, or as a string of the form "#RRGGBBAA".
NOTE: most devices draw nothing if a colour is not opaque,
but PDF and Quartz devices will render semitransparent colours.
A new argument 'alpha' to the function col2rgb()
provides the ability to return the alpha component of
colours (as well as the red, green, and blue compon...