Description Usage Arguments Details Value Author(s) See Also Examples
Creates an image of colors or shades of gray that represent the values of a statistic for each spot on a spotted microarray. This function can be used to explore any spatial effects across the microarray.
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z |
numeric vector or array. This vector can contain any spot statistics, such as log intensity ratios, spot sizes or shapes, or t-statistics. Missing values are allowed and will result in blank spots on the image. Infinite values are not allowed. |
layout |
a list specifying the dimensions of the spot matrix and the grid matrix. |
low |
color associated with low values of |
high |
color associated with high values of |
ncolors |
number of color shades used in the image including low and high. |
zerocenter |
should zero values of |
zlim |
numerical vector of length 2 giving the extreme values of |
mar |
numeric vector of length 4 specifying the width of the margin around the plot.
This argument is passed to |
legend |
logical, if |
... |
any other arguments will be passed to the function image |
This function may be used to plot the values of any spot-specific statistic, such as the log intensity ratio, background intensity or a quality measure such as spot size or shape. The image follows the layout of an actual microarray slide with the bottom left corner representing the spot (1,1,1,1). The color range is used to represent the range of values for the statistic. When this function is used to plot the red/green log-ratios, it is intended to be an in silico version of the classic false-colored red-yellow-green image of a scanned two-color microarray.
This function is related to the earlier plot.spatial
function in the sma
package and to the later maImage
function in the marray
package.
It differs from plot.spatial
most noticeably in that all the spots are plotted and the image is plotted from bottom left rather than from top left.
It is intended to display spatial patterns and artefacts rather than to highlight only the extreme values as does plot.spatial
.
It differs from maImage
in that any statistic may be plotted and in its use of a red-yellow-green color scheme for log-ratios, similar to the classic false-colored jpeg image, rather than the red-black-green color scheme associated with heat maps.
An plot is created on the current graphics device.
Gordon Smyth
maImage
in the marray package, image
in the graphics package.
An overview of diagnostic functions available in LIMMA is given in 09.Diagnostics.
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