Hi, I am using image() function to plot a matrix which has some missing valuies (NA). It looks like, by default, missing values were drawn in white color, How can I change that into a different color, say a gray color? I tried to use bg='gray' argument with no luck. Anyone has a suggestion? Thanks
background colors in image()
5 messages · Brian Ripley, Romain Francois, array chip
On Wed, 10 Aug 2005, someone needing to conceal his real name wrote:
Hi, I am using image() function to plot a matrix which has some missing valuies (NA). It looks like, by default, missing values were drawn in white color, How can I change that into a different color, say a gray color? I tried to use bg='gray' argument with no luck. Anyone has a suggestion?
They are not drawn in white: in fact they are not drawn at all, so the current background (or if transparent, the canvas) is what you see.
par(bg="yellow") image(matrix(c(1,2,NA, 1),2, 2))
works, for example.
Brian D. Ripley, ripley at stats.ox.ac.uk Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595
Thanks for the suggestion! It works in a way that the entire graph window is in the background color, is there a way to only have the plotting area (i.e. the area within the axis box in the background color, but leave the area outside the axes to be unchanged (white)? Thanks!
--- Prof Brian Ripley <ripley at stats.ox.ac.uk> wrote:
On Wed, 10 Aug 2005, someone needing to conceal his real name wrote:
Hi, I am using image() function to plot a matrix
which
has some missing valuies (NA). It looks like, by default, missing values were drawn in white color,
How
can I change that into a different color, say a
gray
color? I tried to use bg='gray' argument with no
luck.
Anyone has a suggestion?
They are not drawn in white: in fact they are not drawn at all, so the current background (or if transparent, the canvas) is what you see.
par(bg="yellow") image(matrix(c(1,2,NA, 1),2, 2))
works, for example. -- Brian D. Ripley, ripley at stats.ox.ac.uk Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595
Le 11.08.2005 00:59, array chip a ??crit :
Thanks for the suggestion! It works in a way that the entire graph window is in the background color, is there a way to only have the plotting area (i.e. the area within the axis box in the background color, but leave the area outside the axes to be unchanged (white)? Thanks!
You need to learn how to use par('usr') and argument add in image.
demo('graphics') is one way to learn or look at graph 8 on r graph gallery
R> image(matrix(c(1,2,NA, 1),2, 2))
R> usr <- par('usr')
R> rect(usr[1], usr[3], usr[2], usr[4], col="cornsilk")
R> image(matrix(c(1,2,NA, 1),2, 2),add=TRUE)
Romain
--- Prof Brian Ripley <ripley at stats.ox.ac.uk> wrote:
On Wed, 10 Aug 2005, someone needing to conceal his real name wrote:
Hi, I am using image() function to plot a matrix
which
has some missing valuies (NA). It looks like, by
default, missing values were drawn in white color,
How
can I change that into a different color, say a
gray
color? I tried to use bg='gray' argument with no
luck.
Anyone has a suggestion?
They are not drawn in white: in fact they are not drawn at all, so the current background (or if transparent, the canvas) is what you see.
par(bg="yellow")
image(matrix(c(1,2,NA, 1),2, 2))
works, for example. -- Brian D. Ripley, ripley at stats.ox.ac.uk Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595
visit the R Graph Gallery : http://addictedtor.free.fr/graphiques ~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~ ~~~~~~ Romain FRANCOIS - http://addictedtor.free.fr ~~~~~~ ~~~~ Etudiant ISUP - CS3 - Industrie et Services ~~~~ ~~ http://www.isup.cicrp.jussieu.fr/ ~~ ~~~~ Stagiaire INRIA Futurs - Equipe SELECT ~~~~ ~~~~~~ http://www.inria.fr/recherche/equipes/select.fr.html ~~~~~~ ~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~
Romain, Thanks for the code. It worked perfectly!
--- Romain Francois <francoisromain at free.fr> wrote:
Le 11.08.2005 00:59, array chip a ??crit :
Thanks for the suggestion! It works in a way that
the
entire graph window is in the background color, is there a way to only have the plotting area (i.e.
the
area within the axis box in the background color,
but
leave the area outside the axes to be unchanged (white)? Thanks!
You need to learn how to use par('usr') and argument
add in image.
demo('graphics') is one way to learn or look at
graph 8 on r graph gallery
R> image(matrix(c(1,2,NA, 1),2, 2))
R> usr <- par('usr')
R> rect(usr[1], usr[3], usr[2], usr[4],
col="cornsilk")
R> image(matrix(c(1,2,NA, 1),2, 2),add=TRUE)
Romain
--- Prof Brian Ripley <ripley at stats.ox.ac.uk>
wrote:
On Wed, 10 Aug 2005, someone needing to conceal
his
real name wrote:
Hi, I am using image() function to plot a matrix
which
has some missing valuies (NA). It looks like, by default, missing values were drawn in white
color,
How
can I change that into a different color, say a
gray
color? I tried to use bg='gray' argument with no
luck.
Anyone has a suggestion?
They are not drawn in white: in fact they are not drawn at all, so the current background (or if transparent, the canvas) is what you see.
par(bg="yellow")
image(matrix(c(1,2,NA, 1),2, 2))
works, for example. -- Brian D. Ripley, ripley at stats.ox.ac.uk Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595
-- visit the R Graph Gallery : http://addictedtor.free.fr/graphiques ~~~~~~~~
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
~~~~~~~~ ~~~~~~ Romain FRANCOIS - http://addictedtor.free.fr ~~~~~~ ~~~~ Etudiant ISUP - CS3 - Industrie et Services ~~~~ ~~ http://www.isup.cicrp.jussieu.fr/ ~~ ~~~~ Stagiaire INRIA Futurs - Equipe SELECT ~~~~ ~~~~~~ http://www.inria.fr/recherche/equipes/select.fr.html ~~~~~~ ~~~~~~~~
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
~~~~~~~~