[R] Tweaking my plot of matrix as image
Petr PIKAL
petr.pikal at precheza.cz
Thu Apr 12 11:36:43 CEST 2007
Hi
Did you by chance look at the help page of image? If you did, you could
read
x,y
locations of grid lines at which the values in z are measured. These must
be finite, non-missing and in (strictly) ascending order. By default,
equally spaced values from 0 to 1 are used. If x is a list, its components
x$x and x$y are used for x and y, respectively. If the list has component
z this is used for z.
z
a matrix containing the values to be plotted (NAs are allowed). Note that
x can be used instead of z for convenience.
and therefore
image(1:20, 1:20, your.matrix)
shall do what you probably want. And if you have different matrix size
then
1:dim(your.matrix)[1]
can give you suitable sequence.
Regards
Petr Pikal
petr.pikal at precheza.cz
r-help-bounces at stat.math.ethz.ch napsal dne 12.04.2007 10:55:21:
> Greetings list,
>
> I have a rectangular 20 x 20 matrix with values in the range of [0 ,
> 1]. I'd like to plot it as an image. To that end, I have used the
> image() function that seems to do what I want. Now, I just want to
> tweak it to look perfect. So here is my question:
>
> At the moment, the values of the axis range from [0, 1]. I want it to
> show the row and column of the matrix. How do I do that?
>
> Thanks in advance.
>
> Wee-Jin
>
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